Category Archives: Fasteners

Looking for Quality & Reliability Fasteners – Choose Simpson Strong-Tie

Simpson Strong-Tie Self-Drilling Screws

Driven to Exceed Expectations

In the vast, extremely competitive fasteners industry, Simpson Strong-Tie stands above the rest. Simpson Strong-Tie’s top priority is to deliver high quality and reliable products that their customers can put their trust in. This is why each production of fasteners is put through rigorous tests to ensure their fasteners can handle higher loads, resist corrosion and make installation more efficient. Due to the dedication that Simpson puts into the production of their products is why Tanner is proud to be able to offer these high quality products to our customers. Read on to learn more about some of our latest additions to our ever growing fastener inventory.

Latest Self-Drilling Additions

Strong-Drive® Self-Drilling X Metal Screws

*Collated Option Also Available*

Strong-Drive® Self-Drilling X Metal Screws are commonly used for fastening steel decking to structural steel, steel stitching (“side-lap” stitching) and cold-formed steel framing.

  • 5/16″ Hex Head
  • Drill Point
  • Hex-Washer HeadStrong-Drive-Self-Drilling-X-Metal-Screws
  • Available in Straight Collation

Codes & Listings

  • ICC-ES ESR-3006
  • IAPMO UES ER-326
  • State of Florida FL16937
  • City of Los Angeles RR25670
  • City of Los Angeles RR26009
  • FM Approval 3045651 & 3050714 (XU only)
  • ASTM C1513 Compliant
  • SDI DDM03 Appendix VII

Warnings: Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments. Accordingly, use this product in dry, interior, and noncorrosive environments only.

Strong-Drive® PPSD SHEATHING-TO-CFS Screws

*Collated Option Also Available*

Strong-Drive® PPSD SHEATHING-TO-CFS Structural Screws are used for fastening wood subfloor/sheathing to cold-formed steel. (#8 — maximum thickness: 54 mil / 16 ga.; #10 and #12 — maximum thickness: 97 mil / 12 ga.)

  • Flat Head with Nibs for Easier Countersinking
  • #3 Square Drive
  • Fine ThreadsStrong-Drive-PPSD-SHEATHING-TO-CFS-Screws
  • Pilot Point
  • #8 & #10 Screws Meet Minimum Head Diameter Requirement Per AISI S213-07, Lateral Design Standard
  • Quik Guard® & Yellow Zinc Coating
  • Available in Curved Collation

Codes & Listings

  • ICC-ES ESR-3006
  • City of Los Angeles RR25670
  • ASTM C1513 Compliant

Warnings: Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments. Accordingly, use this product in dry, interior, and noncorrosive environments only.

CBSDQ Sheathing-to-CFS Screws (Collated)

CBSDQ Sheathing-to-CFS Screws are used for securing sheathing to cold-formed steel (recommended thicknesses: 16 and 18 ga.).

  • Ribbed Flat Head with Nibs for Easy Countersinking
  • #2 Undersized Square Drive
  • #2 Drill Point with Wings
  • Quik Guard® CoatingCBSDQ-Sheathing-to-CFS-Screws
  • Curved collation

Codes & Listings

  • City of Los Angeles RR25670
  • ASTM C1513 Compliant
  • #8 Screws Meet Minimum Head Diameter Requirement Per AISI S213-07, Lateral Design Standard

Warnings: Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments. Accordingly, use this product in dry, interior, and noncorrosive environments only.

Celebrate the Holiday, Shop USA Made Products from Tanner


Shop, Build, Thrive with American Made Products

With the 4th of July right around the corner, there is no better time than now to celebrate this great country and shop for American made products. Most consumers when given the choice, would choose to buy American made products due to a number of factors. When you buy American made products, you are helping to support local businesses, contributing to domestic job growth and keeping American manufacturing strong in the global economy. Along with all of this, most of this time you will be buying a superior product when compared to imports.

Proud to Carry USA Made Products

Tanner is proud to carry an extensive number of USA made products, due to their exceptional quality and high performance. With such a wide variety of products to choose from, our customers are sure to find a number of American made tools, fasteners & industrial supplies for all of their needs. To help celebrate the 4th of July we have decided to help our customers easily find and shop for some of our best selling USA made products. Read on to find a wide selection of USA made fasteners, abrasives, cutting tools, hand tools, safety equipment and much more.

Shop Some of Our Top American Made Products at Tanner

Below are some of our best selling American made products, when shopping look for the banner below to identify our USA Made products.


USA Made Fasteners

USA Made Anchors

USA Made Abrasives

USA Made Saw Blades

USA Made Lifting & Rigging Products

USA Made Hand Tools

USA Made Safety Equipment


Tanner Demo Days

Featuring Simpson Strong-Tie Collated Fasteners

Join us at our Brooklyn West location Thursday February 16th for great deal and demos of Simpson Strong-Tie Collated Fasteners. Promotional pricing and FREE giveaways are only available in-store, so be sure to stop in from 8 A.M. – 2 P.M. on February 16th! For more details about this event please see the flyer below.

Click here for directions to our Brooklyn West Location


Simpson Strong Tie 2 Page Flyer - Grouped

Stainless Steel Threaded Concrete Anchors by Elco®

The Only Choice for Concrete & Masonry Applications in Highly Corrosive Environments

Elco® Construction Products help provide improved building integrity, ensure strength, and can perform even in the most demanding environments. To meet the needs of the wide range of concrete and masonry applications in corrosive environments, Elco® offers three different stainless steel concrete and masonry anchors:

Read on to learn more about the features and benefits of using these concrete and masonry anchors.


Aggre-Gator® Bi-Metal Fasteners

The Corrosion Resistance of 300 Series Stainless Steel in a Threaded Concrete Anchor

Aggre-Gator® Bi-Metal Threaded Concrete Anchors are made from 300 series (18-8) stainless steel alloy, providing an unmatched corrosion resistance for your toughest applications. The Silver Stalgard® GB Coating protects aluminum components from accelerated corrosion when it comes in contact with 300 series stainless steel. The gimlet point of the Aggre-Gator® fasteners allow for quick starts and make them an ideal anchor for treated, wood-to-wood applications. When working with block and concrete, the fused and hardened steel tapping threads make installation easy and provide a tight hold into the material.

  • Bi-metal technology – 300 (18-8) stainless steel head and shankaggregator-screws
  • Fused and hardened steel tapping threads and a gimlet point
  • Alternating, hi-low notched thread profile
  • Silver-colored Stalgard GB coating
  • Hex washer head and TrimFit® flat head designs
  • Outstanding corrosion resistance
  • Long service life
  • High strength and ductility
  • Offers greater galvanic compatibility in dissimilar metal applications involving aluminum
  • Thread profile provides quick cutting and stability during installations
  • High in-place value over the life of structures
  • Exposed anchoring/coastal/wet areas
  • Aluminum enclosures
  • Hurricane shutters/windows/awnings/thresholds
  • Curtain wall & window wall support anchors
  • Stone facade support anchors
  • ACQ-treated wood

UltraCon® SS4 Threaded Masonry Anchorsultracon-ss4-logo

410 Stainless Steel with Stalgard® Coating for Excellent Corrosion Resistance

UltraCon® SS4 Masonry Anchors combine the proven strength and performance of UltraCon® anchors with the outstanding corrosion resistance of Stalgard® Coating over 410 stainless steel. UltraCon® SS4 Masonry Anchors are the ideal choice for jobs involving highly corrosive environments. In a Pull-Out Test in 4.4 KSI Concrete, full embedment 2″, the Ultracon® SS4 Anchors far outperformed the ITW’s 410 SS Tapcon® Anchors.salt-test

  • UltraCon® SS4 – 3,294 lbs. Pull Out Value
  • ITW 410 SS Tapcon® – 2,666 lbs. Pull Out Value

UltraCon SS4 Anchors and ITW’s 410 Stainless Steel Tapcon Anchors were put to the test and subjected to 1,500 hours of salt spray testing (per ASTM B117). Typical results from the salt spray testing can be seen in the samples shown to the right. As you can see the UltraCon SS4 Anchors show no signs of red rust even after 1,500 hours of salt spray testing.

Features and Benefits:ultracon-ss4-screw
  • 410 stainless steel
  • 1/4″ diameter
  • Installs with standard 3/16″ masonry drill bit
  • 1-1/4″ to 4″ lengths
  • Hex washer and Phillips TrimFit® flat heads
  • V-notched twin-lead threads
  • Gimlet point
  • Silver Stalgard® coating provides 1600 hours of salt spray protection per ASTM B117
  • Miami-Dade Florida NOA pending

Crete-Flex® SS4 Masonry Fastenerscrete-flex-logo

Extraordinary Strength and Fastener Performance

Crete-Flex® SS4 Masonry Fastening System is a family of high performance 410 stainless steel masonry anchors. These anchors deliver corrosion resistance, installation consistency, and outstanding performance when working with concrete and hollow block.

Engineering Technology

Oversized Threads: #14 diameter Crete-Flex® Anchors have a .268″ O.D. and .201″ I.D. These root diameters are much larger than standard concrete anchors and help provide exceptional performance, including higher shear values.
Unique Thread Design: Crete-Flex® are made with resilient 40º threads to help enhance thread engagement and “V” notches for efficient tapping. These 2 features help provide exceptional mechanical strengths.

Superior Corrosion Resistance

Special Heat Treatment: Heat treatment is necessary for added corrosion resistance and tapping into the concrete. Typically 410 stainless steel fasteners are case hardened, but this can adversely impact the fastener’s ductility and corrosion resistance. Due to this Crete-Flex® Anchors get a special heat treatment to help allow the 410 stainless steel to retain more of its natural corrosion resistance and ductility.
Unique Finish: Crete-Flex® Anchors all receive Elco’s unequaled Stalgard® coating. In combination with the special heat treatment, Crete-Flex® Anchors boast superior corrosion resistance. Crete-Flex® Anchors showed no signs of red rust, even after 1,600 hours in a salt spray cabinet (per ASTM B117).

  • 410 stainless steel
  • Oversized #14 diametercrete-flex-screw
    • Shank (unthreaded section): .214″
    • Major thread diameter (O.D.): .268″
    • Minor thread diameter (I.D.): .201″
  • Heavy-duty, V-notched thread with larger cross-sectional area (25% greater than other commonly-used masonry fasteners)
  • Hex washer, flat, hex flange and TrimFit® flat heads available
  • Gimlet point
  • Special heat treatment
  • Silver Stalgard corrosion-resistant finish provides 1600 hours of salt spray resistance
  • Made in the U.S.A.
  • Installed with a 7/32″ carbide-tipped masonry drill bit
  • Exceptionally high shear values and pull out values
  • Enhanced corrosion resistance
  • Easy and consistent installation

Strength Design Power-Stud® Expansion Anchors by Powers Fasteners®

What are Expansion Anchors?

Expansion Anchors can be used to describe the majority of concrete and masonry anchors. Expansion anchors have an expansion mechanism that is designed to compress against the base material. Each style of expansion anchor can have a different expansion mechanism, which can either be a sleeve, slotted shell, slotted stud, or wedge assembly. The expansion mechanisms are actuated by a tapered cone, tapered plug, nail, bolt, or screw depending on the anchor. The compression of the expansion mechanism against the wall of the drilled hole allows the anchor to transfer the load to the base material. Anchors that are expanded by tightening a bolt or nut are considered to be torque controlled anchors.

Powers Strength Design Power-Stud® Expansion Anchors

Power-Stud®+ SD1

Power-Stud®+ SD1 Anchors are fully threaded, torque-controlled, wedge expansion anchors. They are designed for consistent performance in cracked and uncracked concrete. Power-Stud®+ SD1 Anchors are suitable to be used in normal-weight concrete, sand lightweight concrete, concrete over steel deck, and grouted concrete masonry. These anchors are manufactured with a zinc plated carbon steel body and expansion clip for premium performance, nut, and washer are included.

Code Listings:SD1 Code Listings

  • ICC-ES ESR 2818 – Category 1, Cracked & Uncracked Concrete
  • ICC-ES ESR 2966 – Concrete Masonry Units (CMU)

General Applications & Uses:

  • Structural connections, i.e., beam and column anchorage
  • Safety-related attachments
  • Interior applications / low-level corrosion environmentSD1 Anchors
  • Tension zone applications, i.e., cable trays and strut, pipe supports, fire sprinklers
  • Seismic and wind loading

Power-Stud®+ SD2

Power-Stud®+ SD2 Anchors are fully threaded, torque-controlled, wedge expansion anchors. They are designed for consistent performance in cracked and uncracked concrete. Power-Stud®+ SD2 Anchors are suitable to be used in normal-weight concrete, sand lightweight concrete, and concrete over steel deck. These anchors are manufactured with a zinc plated carbon steel body and stainless steel expansion clip for premium performance, nut and washer are included.

Code Listings:SD2 Code Listings

  • ICC-ES ESR 2502 – Category 1, Cracked & Uncracked Concrete

General Applications & Uses:

  • Structural connections, i.e., beam and column anchorage
  • Utility and safety-related attachments
  • Interior applications / low-level corrosion environment
  • Tension zone applications, i.e., cable trays and strut, pipe supports, fire sprinklersSD2 Anchors
  • Seismic and wind loading
  • Medium to heavy-duty purposes

Power-Stud®+ SD4 / SD6

Power-Stud+™ SD4 & Power-Stud+™ SD6 Anchors are fully threaded, torque-controlled, wedge expansion anchors. They are designed for consistent performance in cracked and uncracked concrete. Power-Stud+™ SD4 and Power-Stud+™ SD6 Anchors are suitable to be used in normal-weight concrete, sand lightweight concrete, and grouted concrete masonry (CMU). These anchors are manufactured with a stainless steel body and expansion clip for premium performance, nut and washer included. Power-Stud+™ SD4 anchors are made from Type 304 Stainless Steel. Power-Stud+™ SD6 anchors are made from Type 316 Stainless Steel.

Code Listings:SD4 SD6 Code Listings

  • ICC-ES ESR 2502 – Category 1, Cracked & Uncracked Concrete

General Applications & Uses:

  • Structural connections, i.e., beam and column anchorage
  • Safety-related and common attachmentsSD4 SD6 Anchors
  • Interior and exterior applications
  • Tension zone applications, i.e., cable trays and strut, pipe supports, fire sprinklers

 Available at Tanner Now!

All of these high-quality Strength Design Expansion Anchors can be found & bought at At Tanner, we provide our customers with the highest quality products available on the market, which is why we are proud to sell Powers Fasteners®. We sell all of the Fastening Innovations Powers® has to offer including Power-Bolt®, Wedge-Bolt®+, Tapper® +AC100+ Gold®, & much more!

Tanner 2016 / 2017 Line Card Out Now!

Tanner is an Authorized Distributor of All of the Products On Our Line Card

Tanner, a trusted provider to the industrial & construction industries, has been providing its customers with premier brands and top of the line products for over 35 years. Please take the time to look over, download, and share our new 2016 Line Card. On the New Tanner 2016 / 2017 Line Card you will find a number of our top selling products frequently purchased from us.

You can download the Tanner 2016 / 2017  Line Card here or you can check it out in our newly revamped Resource Center. In the Resource Center you will also find product videos, useful selection guides, and much more!

Our most recent additions to the Resource Center are: Safety in Lifting – Sling Inspections Video and Choosing a 3M™ Safety Harness Guide PDF.


Elco’s Flex Technology Products are the Industry Leader in Critical Fastening

Elco’s Flex Technology Line of Products Far Surpasses Any Standard Fastening Format Available

Delayed embrittlement is a common, but potentially catastrophic downfall that standard case hardened fasteners are subject to. Delayed embrittlement is brought on by the presence of hydrogen, which is generated in dissimilar metal applications. To combat this problem, Elco Construction Products has developed a line of fastening products that utilize Flex Technology. These Flex Technology fasteners were developed for high performance and to be virtually immune to delayed embrittlement failures. These fasteners are manufactured with special alloy materials that have received proprietary heat treatments and tempering processes. Flex Technology fasteners enhance the performance of critical connections and all feature a multi-layered, durable Stalgard corrosion resistant coating. Read on to learn more about some of these great Flex Technology Fasteners that are available to you.

Dril-Flex® Structural Self-Drilling Fasteners

Virtually Immune to Hydrogen-Assisted Stress Corrosion Cracking for Maximum Performance

Dril-Flex® Structural Self-Drilling Fasteners are designed to help prevent hydrogen-induced brittle failures. These fasteners are tested in accordance to ASTM standards, Dril-Flex® fasteners have proven to provide the same resistance to hydrogen-assisted cracking (HAC) as a Grade 5 fastener. Dril-Flex® fasteners are developed with the unique Flex Technology dual-hardening process. These fasteners are then finished with a silver Stalgard coating to provide a superior corrosion resistance and enhanced galvanic compatibility. The combination of the dual-hardening process along with the Stalgard coating, result in making Dril-Flex® fasteners the ideal fastening solution for demanding construction applications.

Features & BenefitsDril-Flex® Structural Self-Drilling Fasteners

  • Self-drilling point to ensures consistent, reliable drilling and tapping
  • Eliminates separate drilling and tapping operations
  • Higher hardness point and lead threads (HRC 52 min.)
  • Lower hardness load bearing threads (HRC 28-34)
  • Silver Stalgard corrosion resistant coating – superior to zinc or cadmium-based finishes
  • Virtually immune to delayed HASCC brittle failures
  • Provides the same high resistance to hydrogen-assisted failure as a Grade 5 fastener
  • Provides enhanced galvanic compatibility in dissimilar metal applications
  • Approvals: ICC ES ER-4780 Legacy Report; COLA (City of Los Angeles) Research Report #25095

Bi-Flex™ Bi-Metal Fasteners

Corrosion Resistance of 300 Series Stainless Steel and the Efficiency of Drill Screws

Bi-Flex™ Bi-Metal Fasteners utilize bi-metal technology to create a single, unique fastening system that resists visible corrosion and is virtually immune to hydrogen-induced stress corrosion failures. Bi-Flex™ fasteners are made from 300 series (18-8) stainless steel alloy to provide corrosion resistance in even the toughest environments. They feature a fused and hardened steel drill point and lead threads. This allows the Bi-Flex™ fasteners to quickly drill and tap structural steel and aluminum up to 1/2″ thick. These fasteners also feature a silver Stalgard® GB coating, a galvanic barrier helps protect aluminum components from accelerated corrosion when in contact with 300 series stainless steel. The dependability and ease of installation make Elco’s Bi-Flex™ Bi-Metal Fasteners the best choice for your toughest construction applications.

Features & BenefitsBi-Flex™ Bi-Metal Fasteners

  • Bi-metal technology – 300 series (18-8) stainless steel head and shank
  • Fused and hardened steel drill point
  • Quickly drill and tap into steel or aluminum up to 1/2″ thick
  • Silver-colored Stalgard® GB coating
  • Greater galvanic compatibility in dissimilar metal applications involving aluminum
  • Wide variety of sizes and head styles
  • Outstanding corrosion resistance and long service life
  • High strength, ductility, and reliability
  • Virtually immune to delayed embrittlement failures
  • High in-place value over the life of structures, components, and systems
  • Approvals: City of Los Angeles (COLA) Research Report: RR25886 (CSI #05 05 23)

Elco’s Family of Fastening Products Available at Tanner

At Tanner we pride ourselves on supplying you with the full line of Elco’s Flex Technology Fasteners, as well as their Metal Fasteners and Concrete Anchors. Some of these top brands include Aggre-Gator® Bi-Metal Masonry FastenersAlumi-Flex™ 302 Stainless Steel Self Drilling ScrewsTap-Flex® Thread Forming Structural ScrewsUltraCon® Masonry Fasteners, and much more! Along with all these great Elco fasteners, Tanner also offers a wide variety of Standard Self Drilling Screws. In our Self Drilling Screws Department you will find 18-8 Stainless Steel, 410 Stainless Steel, and Carbon Steel options.




Learn More About Wood, Drywall, and Masonry Screws

Masonry Screws

Masonry Screws

  •  Alternating high and low threads
  • Come in Phillips flat head or slotted hex washer head

  • Commonly blue in color

  • Self-tapping screw

  • A correctly drilled pilot hole is critical while installing masonry screws


Masonry screws are a self-tapping screw that can be used in a variety of base materials that include: concrete, brick, mortar joints/block and CMU. They are manufactured out of stainless or carbon steel and come with or without a corrosion coating. Masonry screws are available in two different head styles, each designed for different applications. For applications where the head needs to be countersunk in the material, a flat countersunk Phillips head screw should be used. If the screw head will be on top of the material then a hex washer head should be used.

Concrete screws have alternating high and low threads. The lead thread on the masonry screw does all the cutting of the masonry material while the screw is being installed. The lead thread will dull and hit a point where it will no longer be able to cut threads and will stop screw penetration. The abrasiveness of the masonry material will determine the exact length any specific screw can tap.

When installing masonry screws a pilot hole must be drilled with a carbide drill bit before inserting the screw. The diameter of the pilot hole is critical and must be drilled in accordance with the manufacturer’s instructions. The size of the pilot hole must be correct or it could cause the screw to break on insertion, will strip the hole, or will not provide the rated holding force.

Wood ScrewsWood Screws

  • Pre-drilling is recommended especially when using hardwoods

  • Tapered, partially threaded shank, shorter lengths are fully threaded

  • Sharp gimlet point for easy startup

  • Coarse and sharply crested threads, creates its own internal mating threads

  • Creates a tight joint, but can be removed easily without damage


Wood screws have a sharp gimlet point and a tapered partially threaded shaft, shorter lengths are fully threaded. Wood screws are commonly available with flat, pan, or oval heads. The unthreaded portion of the shank is designed to slip through the top board and prevent cross-threading as it pulls the two pieces of wood together.

Wood screws have coarse, sharply crested threads that create their own internal mating threads. Thread styles can greatly differ, especially in-depth and spacing. Coarse (large) threads are made for use in softwoods. While fine (smaller, closely spaced) threads work best in hardwoods. Extra coarse threads are designed for use in particleboard. High-low threads are typically found on general-purpose screws and work well with most types of wood. Serrated threads have “teeth” that help cut into the wood and make it easier to drive.

Drywall ScrewsDrywall Screws

  •  Drywall screws may be used to fasten drywall to both wood and metal studs
  • Drywall screws feature a bugle shaped Phillips head

  • The diameter of drywall screw threads is larger than the shaft diameter

  • A versatile construction fastener with many uses


Drywall screws have a bugle shaped Phillips head and a sharp piercing tip designed to attach drywall to wood and metal studs, while not damaging the drywall in the process. When finished driving, drywall screws are recessed slightly into the drywall. Drywall screws are typically manufactured out of case hardened steel with a black phosphate finish.

Drywall screws with coarse threads are used to attach drywall to wood framing. While drywall screws with a fine thread are best suited for attaching drywall to light-gauge steel framing. Self-drilling drywall screws are also used when working with metal studs or frames.


3 Common Screw Types at a Glance – Machine, Sheet Metal, and Cap Screws

Machine ScrewsMachine Screws

  •  Fully threaded shank
  • Usually used with a nut

  • Typically smaller than the average screw

  • Designed to be fastened to an existing tapped hole

Machine screws, also sometimes referred to as machine bolts, are normally smaller than the average screw. They usually range in sizes up to ¾ of an inch (19.05 mm), but can still come in larger variations. Typically machine screws are designed to be fastened to an existing tapped hole on a metal surface, usually in conjunction with a corresponding nut. The main differentiating characteristics of machine screws are: overall size, shape of head, slot type, length, material, and thread type.

The two main drive types associated with machine screws are slotted (flat head) and Phillips. There are also a number of specialized drives that they can come in, these are typically associated with tamper-resistant screws. Some of these drive types include, torx – six pointed, spanner, and trident to name a few. The shape of the head will determine how the machine screw lies once it’s fastened in place. Round and Pan heads will protrude from a flat surface, while flat head machine screws are designed for holes that are countersunk so that they lay flush with the surface.

Machine screws are always threaded the entire length of its shank. Threading on a machine screw is very important because the corresponding holes that they are being fastened into are typically tapped for a specific size and type of screw thread. The two main characteristics of threads are size of the outer diameter of the threads and pitch, the distance between each thread. Machine screw can be made to have either clockwise (right-handed) or counter-clockwise (left-handed) thread.

Sheet Metal ScrewsSheet Metal Screws

  • Fully threaded shank

  • Very versatile fastener, can be used in metal, wood, and plastics

  • Most are self-tapping screws and only require a pre-drilled hole, some come with self-drilling tips

  • Specially hardened, sharp threads that allow it to cut into material and form its own internal thread

Sheet metal screws have a fully threaded shank with sharp threads and tip that allow them to cut through metal, wood, plastic, and various other materials. The size of sheet metal screws are commonly shown as a series of three numbers, these numbers represent the diameter, thread count, and length of fastener. A sheet metal screw listed as 4-32 x 1-½” has a diameter size of 4, 32 threads per inch, and a length of 1-½”.

There are two basic types of sheet metal screws, self-tapping screws and self-drilling screws. Self-tapping screws have a sharp tip that is designed to cut through metal, but the metal must be pre-drilled before these screws can be used. Self-drilling screws have a drill point tip that can easily cut through metal without a pre-drilled hole.

The head of sheet metal screws can come in a number of different styles. Pan or round head screw will have heads that extend above the surface of the material after being installed. Flat or oval countersunk screws will be flush with the top of the material after being installed. These screws can come with a Phillips, flat, or combo drive.

Sheet metal screws made out of carbon steel are the most common and typically the most economical. These screws are prone to rust and corrosion when exposed to moisture or chemicals, so they should typically only be used indoors. Galvanized or stainless steel screws are designed to resist rust and corrosion, but tend to cost more than the standard steel screws. Sheet metal screws may be coated with zinc or nickel to modify their appearance.

Cap ScrewsCap Screws

  • Normally used without a nut

  • Available in both English and metric sizes

  • Fasten machine parts – home appliances / consumer electronic devices

  • Large head, diameter is larger than threaded portion

Cap screws have a large head and a cylindrical shaft with external threads. The head has a larger diameter than the threaded portion, this provides a positive mechanical stop when tightening the screw. Cap screws are tightened directly into a threaded or tapped hole, usually without a nut. A cap screw can generate a high amount of clamping force when tightened.

Commonly used cap screw heads styles include: hex head, socket head, and button head. Cap screws are typically  manufactured out of carbon steel, stainless steel, and metal alloys. The choice of type and size of of cap screw for a particular application mostly depends on the forces required to adequately secure the mechanical connection.

How do I Choose the Correct Self-Drilling and Self-Tapping Screws??

Self-Drilling Screws

Self-Drilling Screws operate on the same principles as drill bits and other cutting tools. This means that the way in which these screws are used affects their performance as much how they are designed.

Two important factors to consider when selecting a self-drilling screw are, material thickness and types of materials to be joined.

Screw Suitability
Optimal Cutting Parameters by Screw Size







Key Design Features to Consider when Selecting a Suitable Self-Drilling Fastener

  • Drill Flute

    • The length of the drill flute determines the metal thickness that can be drilled. Drill flutes allow the drilled material to exit the hole. If the drill flute becomes completely embedded in the material, the drill chips will clog the flute and cause the cutting action to cease. If this occurs, the heat from the drill chips could cause the drill point to become over-heated and fail.

  • Point Length

    • The drill point is the unthreaded section from the drill point to the first thread. This length must be long enough to completely drill through the material before the threads engage. If the threads engage too early, they can cause the fastener to bind and break.

  • Screw Wings

    • It is necessary to use fasteners with wings when fastening wood, over ½” thick, to metal. The wings will ream a clearance hole and keep the threads from engaging too early. If the threads engage too early, this could cause a separation of the fastened material from the base material (jacking). Once the wings hit the metal material, they will break off allowing the threads to engage.


Self-Tapping Screws

Self-tapping screws can tap its own hole as it is being driven into it. They can come with a sharp, piercing tip or a flat, blunt tip. Sharp tipped self-tapping screws are designed for drilling their own hole in soft materials. The flat tipped self-tapping screws will need a pilot hole drilled before being installed. Some self-tapping screws are also self-drilling screws. These screws have a drill-like flute tip that looks like the tip of a center drill, along with the tap-like flute in the leading threads. These screws are very efficient in hard substrate applications.

How the Self-Tapping Ability is Created

  • Hard Substrates – Metal or Hard Plastics

    • Often created by cutting a gap in the continuity of the thread on the screw, this generates a flute and cutting edge similar to those on a tap.

  • Soft Substrates – Wood or Soft Plastics

    • The self-tapping ability can come simply from a tip that tapers to a gimlet point (no flute is needed), the point forms the hole by displacement of the surrounding material rather than any chip forming drilling/cutting/evacuating action.

Make Your Facility Tamper Proof with Break-Away Nuts

Break-Away Nuts

Security is a major concern on most peoples minds these days. From securing correctional institutions to protecting from vandalism in public places, having the right security products makes all the difference. At Tanner we are your premier source for security fasteners and nuts, providing you with a variety of different products. When it comes to looking for security nuts, the level of protection it offers should be the main determining factor for which type you buy. You can choose from either tamper resistant or tamper proof security nuts. Tamper resistant security nuts are extremely difficult to remove without the proper tools. While tamper proof security nuts have no removal tools, which makes them nearly impossible to remove once they are installed. The tamper proof security nuts that we offer here at Tanner are Break-Away Nuts.

Break-Away Nuts are designed as a one-piece unit that have a break-away hex head that leaves a conical shaped tamper proof nut behind.  These tamper proof nuts are used extensively in places where high security is a key factor such as: correctional institutions, hospitals, schools, public places, and retail stores. Break-Away Nuts help secure a variety of products, prevent unauthorized removal of, and secure access to equipment and facilities. They can be used for a number of critical security fastening applications where removal of a fixture is not intended and when preventing tampering is important. Break-Away Nuts are installed like a typical nut, except once the proper torque is achieved, the hex head breaks away leaving a conical shaped tamper proof nut behind. The conical shaped tamper proof nut that is left behind has no removal tool available making it nearly impossible to remove once installed.

Break-Away Nuts are manufactured from either ZAMAC 5 zinc alloy or 304 stainless steel. The stainless steel variety provides greater corrosion resistance and boasts high-strength properties compared to the zinc alloy nuts. These security nuts are typically tapped to standard bolt dimensions, but are also available to be tapped oversize for hot dip galvanized fasteners.

Break Away Nuts Material Specifications

If you are looking for a tamper resistant security nut instead, be sure to check out our line of Trident Nuts. We have a number of different sizes available and are one of the few distributors that offer Large Diameter Trident Nuts. If you plan on buying any of these Trident Nuts be sure to pick up the correct sockets and accessories to help install these security nuts correctly.