Marine Grade 316 (A4) Stainless Steel Bi-Metal Self-Drilling Screws

EJOT^® SUPER-SAPHIR JT6 Self-Drilling Screws

EJOT® SUPER-SAPHIR JT6 self-drilling screws are made from Marine Grade 316 Stainless Steel Bi-Metal. They feature a screw head and threads that are made of 316 stainless steel, providing exceptional corrosion protection and superior ductility. SUPER-SAPHIR JT6 self-drilling screws have a classic drill point and are designed to drill, form the thread and fasten components in one work step. The drill point is made of hardened carbon steel that is welded to the body. This allows JT6 fasteners to drill and tap steel up to 1/2 thick.  EJOT® SUPER-SAPHIR JT6 self-drilling screws are completed by an optional pre-assembled sealing washer.

EJOT^® SUPER-SAPHIR Self-Drilling Screws Features

• High-quality grade 316 stainless steel, ISO group A4, DIN 1.4401
• High-quality case hardened carbon steel drill point to DIN standard 10666
• Available with pre-assembled stainless steel EPDM vulcanized sealing washer for a safe seal every time
• Free spin zone (near the head of the screw) for a reliable positive connection (only side lap screws)
• Drill point with small dead center prevents misalignment on the component surface

Proper Selection of SUPER-SAPHIR JT6 Self-Drilling Screws

To properly select your SUPER-SAPHIR JT6 Self-Drilling Screws, you must take into account the clamping thickness and required drilling performance.

Clamp Thickness

To calculate the clamp thickness, you take the thickness of the attachment (a) PLUS (+) the strength of the substructure.

The following formula can be used: Clamp Thickness Greater than or Equal to (a) + 6mm.

Drilling Performance

The drilling performance is calculated from the thickness of the components to be drilled.

The following formula can be used for Direct Bearing Surface (trapezoidal profile to steel substructure): t = component (tI) + component (tII).

The following formula can be used for Sandwich Panels: t = component (tII).

Get Increased Reliability with Sealing Washers

EJOT recommends using the sealing washers with SUPER-SAPHIR JT6 Self-Drilling Screws that are used in unweathered areas. The risk of damaging the screw joint with improper installation (excessive tightening torque, slightly sloped clamping) is significantly reduced when sealing washers are used. Clamp load and tensile stress, are also limited in the screw when using the sealing washers. The sealing washer will also help eliminate a direct exposure of the joint (protective surface coating damaged by the fastening process) – significantly dropping the risk of operational, hydrogen-induced embrittlement failure.

Correctly Install JT6 Self-Drilling Screws with Sealing Washers

When installing SUPER-SAPHIR JT6 Stainless Steel Self-Drilling Screw with Sealing Washers, depth control must be used. Adjustable depth control will prevent the deformation of the sealing washer (washer with elastomer seal). If the sealing washer is properly installed, you may see the rubber seal overlap. But if the metal back of the sealing washer changes from convex to concave, the screw was installed too tight.