Category Archives: Tech Tips

What Screw Point is This? Understanding Screw Point Styles

Learn More About the Most Popular Screw Point Styles

In this blog post, you will learn more about the most popular Screw Point Styles on the market today. With such a wide variety of styles and variations out there, having background knowledge of each type will help you better choose the correct screw types for all of your future fastening applications. Selecting the correct screw point for your application is more important than you may think. The screw point provides a transition between the threads and the point, as well as helping with proper alignment.

Breaking Down Screw Points

To begin, we can categorize screw points into (5) major product groups, with each group having a number of different screw points available.

Screw Point Styles Explained

Tapping Screws

type a point Type A Point A thread forming screw with coarse threads and gimlet point for use in thin metal .015 to .050 thick. Used with drilled, punched or nested holes in sheet metal, resin impregnated plywood, and combinations of material.
type ab point Type AB Point A thread forming screw with spaced threads and gimlet point, combining the locating point of Type A with thread size and pitch of Type B. Normal limitations of type B apply. They are used in thin metal, resinous plywood, and various composite boards. Type AB screws offer a wider range of applications over Type A screws.
type b point Type B Point A thread forming screw with spaced threads and a blunt point with incomplete entering threads for use in heavier metal .050 to .200 thick. Larger root diameter with finer thread pitch for light and heavy sheet metal non – ferrous castings, plastics, impregnated plywood, combinations of materials, and other materials.
type bp point Type BP Point A thread forming screw with spaced threads and a cone point for use where holes are slightly misaligned. Used in heavier metal .050 to .200 thick. Larger root diameter with finer thread pitch for light and heavy sheet metal non – ferrous castings, plastics, impregnated plywood, combinations of materials, and other materials.
deckingscrew17 Type 17 Point A thread cutting screw especially for wood, with a coarse tapping screw thread and a special long sharp point fluted to capture chips. The type 17 point helps the screw penetrate quickly in some of the hardest woods.

Thread Cutting Screws

type f point Type F Point A thread cutting screw with machine screw thread with a blunt tapered point, having multi-cutting edges and chip removal cavities.For heavy gauge sheet metal, aluminum, zinc and lead die castings,cast iron, brass and plastic.
type 1 point Type 1 Point A thread cutting screw with single flute for general use. Produces a fine standard machine screw thread for field replacement. These are also known as a Type D thread cutting screws.
type 23 point Type 23 Point A thread cutting screw with fine machine screw threads, a blunt point and tapered entering edges. These screws offer maximum thread cutting area and excellent chip clearing, with minimum tightening torques. They are used in nonferrous castings, steel sheets, plastics, brass, cast iron, etc. Also known as a type T thread cutting screw.
type 25 point Type 25 Point A thread cutting screw similar to type 23 point except with coarse Type B thread. Type 25 screws have spaced, incomplete tapered threads with a blunt point and tapered entering edges, with one or more cutting edges and chip removal indentations. They are used in plastic, asbestos compositions, and other composites. These screws are also known as a type BT thread cutting screws.
type 17 point Type 17 Point A thread cutting screw for wood with a coarse tapping screw thread and a special long sharp point fluted to capture chips. Type 17 points can also be on Hi-Lo, deep root, deck screws and partical board screws.
type bf point Type BF Point Thread cutting screw with type B threads and blunt taper point having multiple cutting edges and chip cavities.
type g point Type G Point Blunt die point with a single through slot to form two cutting edges. For same general use as type C but where less driving torque is required.

Thread Forming Screws

tri-round Tri-Round: Type TT Point A thread forming screw in mostly coarse machine screw threads. It gives a further advantage of not producing chips verses a thread cutting screw in an untapped hole. Three vertexes perform a roll – forming process to form mating threads. These can be used to eliminate the tapping of unthreaded holes. Much better thread forming than Type C or CA, and drives with less torque.
type c point Type C Point A thread forming screw with either coarse or fine pitch machine screw thread and blunt tapered point. Eliminates chips and permits replacement with standard screw in the field. Higher driving torque required. Type C points are usable in heavy sheet metal and die castings.
type ca point Type CA Point A thread forming screw with either coarse or fine pitch machine screw thread. Same as Type C except with a Gimlet point. The locating point works better than Type C where holes between two adjoining pieces of sheet metal may be somewhat misaligned.
type pt thread Type PT Point A 48° or 60° thread feature reduces displacement of plastic for less internal stress and less tendency to fracture bosses. Better drive/ strip ratio and strip torque are obtained when compared with conventional Type B tapping screws. A good choice for plastic applications.
type hi-lo point Type Hi-Lo Point A Hi-Lo is a dual lead thread forming screw for use in plastic, nylon, wood, or other low density materials. The thread design reduces driving torque, improves drive to strip out torque and lessons the risk of cracking the application.
low root Low Root Point Low root thread is designed in sharp points or blunt points. The wide spaced thread forming screw is designed for plastic applications due to the increase in the drive to strip out ratio and reduced cracking of the boss.

Self-Drilling & Self-Piercing Screws

self-piercing Self-Piercing Point Produces more secure sheet metal assemblies. This fastener can be used as self-drilling screw or used to drive thru pre-punched holes or no holes in light gauge sheet metal. The twin lead drills straight thru sheet metal at peak speed. Perfectly mated threads increase strip and back out pressures. These are also know as a needle point, speed points or sprint points.
self-drilling Self-Drilling Point Comes with drilling points that will drill through metal, wood, and plastic applications. Eliminates all hole preparation, therefore reducing the in-place fastener cost. No punching, drilling or tapping required. There are several points styles including type 2, 3, 4 & 5 drill points depending on the application and size.

Machine & Tapping Screws

header point Header Point One of the least expensive pointing operations applied at the time of heading. This operation provides an end chamfer starting with a diameter smaller than the root diameter of the thread. The minimum reduction of the point is approximately 10% below the maximum minor diameter with an included angle of 40 to 50.
dog point Dog Point A straight pointed section reduced in diameter slightly below the root diameter of the thread, usually extending in length about two-thirds the diameter of the thread. Recommended for ease in starting, to insure against stripping fine threaded products, and to increase efficiency along production lines.
rolled point Rolled Point An efficient method of producing pointed long studs or long screws with an end chamfer similar to the Die Point. The last thread and a half is slightly cupped by the thread roll-over operation.
pinch point Pinch Point (Rounded) An inexpensive method of applying a 40°, 60° or 90° lead-in point having a slightly rounded contour but with pinch-off marks on its surface. Used for aligning several sheets or assembling several parts requiring pilot action.
nail point Nail Point (Pinched) Usually supplied with an approximate 45° included angle having a sharp point and slightly squared surface. Used for impinging or locking against wood or other soft material. Other degrees of included angle and sharpness also available.
cupped point Cupped Point A special cup section supplied on the end of the threaded member having a depression in the end to reduce the area in contact with the surface which increases its holding and locking power under pressure.
round point Round Point A dome-like rounded surface applied to the end of a threaded member in order to offer pressure without disfigurement. Used for adjusting members where friction without cutting action is desirable.
cone point Cone Point A precision forming operation to provide any required included angle. Offers a smooth surface, accurate length, and a sharp point which can be produced to any desired contour to fit your particular requirements.
u drive point Type U Drive Point A thread forming screw with round head metallic drive screws having multiple start threads of large helix angle, with a pivot. featuring case-hardened threads, designed to be harder than the mating part. The Type U-Drive Screw is used when an attachment is not meant to be removed. It is driven into an undersized hole for great adherence, usually in metals or plastics. U-Drive Screws also have a round, unslotted head, again intended for a permanent fixture.

Tanner Introduces FLEXVOLT™ – The Battery that Will Change How You Work Forever

Worlds First Battery that Automatically Changes Voltages when You Change Tools

Tanner & DEWALT Bring You Next Level Power with FLEXVOLT™

DEWALT has revolutionized the modern battery to bring you the FLEXVOLT™ battery system. The revolutionary FLEXVOLT™ battery system brings you the future of power with cordless tools unlike anything you’ve ever experienced. With a highly innovative voltage-changing battery and a lineup of groundbreaking 60V MAX* and 120V MAX* tools to match, FLEXVOLT™ tools have the power that will change the way work gets done. FLEXVOLT™ gives you the power of corded with the freedom of cordless. The full line of FLEXVOLT™ batteries and tools will be available soon for pre-order at Tanner, call us at 800-456-2658 for more information.3 Voltage Platforms in 1 Battery

20V & 60V Capabilities in One Battery

The FLEXVOLT™ battery is backwards compatible with all DEWALT 20V MAX* tools so you get up to 4x the runtime**. The FLEXVOLT™ battery is the only battery that automatically changes voltages when you change tools, so you can slide the battery into a whole new lineup of 60V MAX* and 120V MAX* tools from DEWALT. Support 3 tool platforms all with one battery! Check out Tanner’s list of compatible DEWALT 20V MAX* tools here.

Go From a Corded to a Fully Cordless Jobsite with FLEXVOLT™

Tanner with the help from DEWALT and FLEXVOLT™ want to make working on the jobsite easier and more convenient than ever. The FLEXVOLT™ battery’s ability to automatically change between two voltages gives users a serious advantage when it comes to efficiency. It’s the battery that not only powers, but improves the runtime** of DEWALT 20V MAX* tools, so you don’t have to invest in a whole new system. It’s the battery that brings the power of corded to a new lineup of 60V MAX* and 120V MAX* DEWALT tools so you can finally work on a fully cordless jobsite. This revolutionary battery will change the way things get done. Improve jobsite productivity with your own set of FLEXVOLT™ tools, available for pre-order soon at Tanner, call us at 800-456-2658 for more information.

**With FLEXVOLT™ 60V MAX* battery when used with DEWALT 20V MAX* tools

 DEWALT FLEXVOLT™ Cordless Power Tools & Accessories Offered at Tanner

  • 20V / 60V MAX* FLEXVOLT Battery – 6.0 Amp Hours of Capacity in 20V Max* Tools
    • Battery Chargers
    • Power Stations
  • 60V MAX* Cordless Circular Saw – Up to 339 Cuts Per Charge
    • Circular Saw Blades
  • 60V MAX* Cordless VSR Stud & Joist Drill – Up to 138 Holes Per Charge
    • Hole Saws
  • 60V MAX* Cordless Table Saw – Up to 302 Linear Feet Per Charge
    • Table Saw Blades
  • 60V MAX* Cordless Reciprocating Saw – Up to 158 Cuts Per Charge
    • Reciprocating Saw Blades
  • 60V MAX* Cordless Grinder – Up to 126 Cuts Per Charge
    • Flap Discs
    • Grinding Wheels
  • 120V MAX* Cordless / Corded Miter Saw – Up to 289 Cuts Per Charge
    • Miter Saw Blades
    • 120V Corded Power Supply

How To Measure a Blind Rivet

One of the most common questions we’re asked is, “How do you measure a rivet?”

Let’s use a common code description and break it down, we’ll use ABL6-8A as our example.

The first letter “A” indicates the rivet material. For instance, “A” for aluminum, “S” for steel, “C” for copper and “SS” for stainless steel.

The second letter tells us the head style, “B” for button head, “C” for countersunk.

If there’s a third letter in the description, it’ll be an “L” for large flange head.

The first number in the description is for body diameter, in 32nds.

The second number indicates maximum grip length in 16ths. Grip Range is the “working range” that the rivet can handle to meet the strengths designated in the IFI 114 Standards. Grip Range is not actual length. As a general rule, you would want to subtract 1/8″ off the length of the barrel for the barrel to be able to expand and lock the material together. So using your math skills and reducing 8/16″ to 1/2″ and subtracting 1/8″ you would have a grip range of 3/8″ and your rivet would have a size of 6-8.

The final letter is the mandrel (nail or stem} material. “A” for aluminum, “S” for stainless steel, “B” for brass, “C” for copper. No letter indicates a steel mandrel.

Find Addition Information on Blind Rivets & Shop Our Full Rivet Selection Now

Measuring A Rivet

Visit the Blind Rivets section of

5 Tips for Using Blind Rivets Effectively

Fastening with blind rivets can be a cost-efficient method for fastening… some tips are


#1. The shear and tensile strength of the blind rivet selected and the number of blind rivets used in the application should equal or exceed the joint strength requirements.

#2. The blind rivet body material should be compatible with the materials to be joined to resist galvanic corrosion that may result in a reduction of joint strength. If dissimilar materials are widely separated on the galvanic chart, it is advisable to separate them with a dielectric material such as paint or other coatings.

#3. The total thickness of materials to be joined must be considered. Select the rivet “grip range” which includes the total thickness of materials to be joined.

#4. Use recommended hole sizes for each blind rivet. An undersized hole will not allow insertion of rivet body and an oversize hole may cause rivet failure, joint failure and could adversely affect rivet shear and tensile strengths.

#5. Various head styles are offered to accommodate different assembly needs. The most popular is the button head, whose lower-profile head is twice the diameter of the rivet body. This provides an adequate bearing surface for nearly all applications. The large flange rivet provides a greater bearing surface for fastening soft or brittle facing materials. The countersunk head rivet is available for applications where a flush appearance is required.

Visit the Blind Rivets section of

Sleeve Anchor Solution


Just recently, a customer contacted us from the field looking for a 12” wall anchor to install a metal door frame into a hollow block wall. No local supply house carried such an item. Tanner stocks a sleeve anchor extender that allows for a standard 5″ or 6″ sleeve anchor to be extended in 1-1/4″ increments.


The customer used 5 extenders per anchor hole to reach his required minimum anchor length. And he was able to finish the job quickly and easily – without what he thought would be additional masonry or metal work. Smart suppliers will work with you and customize a solution to your needs. There is no reason to feel locked into standard products, which will deliver disappointing results.

Philosophically speaking, in any modern industry, problems are to be expected. That is simply a reflection of our fast-changing world. What is more important are the solutions  we come up with — not just flimsy “band-aid fixes,” but solutions of substance like the one described above. They translate into significant savings in time, money and materials.


Reciprocating Saw Blades-How do I know which teeth per inch (TPI) I need?

Reciprocating Saw Blades

Match the Correct Tooth Size to the Work.

As with all other toothed linear edge cutting tools, it is very important to match the correct tooth size with the material being cut in order to get the maximum blade life and efficiency from your reciprocating saw blades.

The rule of thumb is that at least three teeth should be engaged in the work at all times. Six to twelve teeth engaged in the work is optimum.

If the tooth being used is too large, for instance cutting thin-walled electrical conduit with a 10 tooth per inch blade, the teeth tend to straddle the thin section and it is relatively easy to strip teeth.

If the teeth are too small for the work, there is not enough room in the tooth gullets to pull out the chips. This can cause premature dulling and tooth stripping.

• For very hard materials, more teeth per inch may improve performance.

• Use more teeth per inch for a smoother finish.

• For faster cutting, use fewer teeth per inch but maintain a minimum of 3 teeth in

contact with the work at all times.

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