Metallics JTEKDF1SS Screws 8 X 1 Fh Ph TS D-Pt2 SS (Jar 100)

Yes. The JTEKDF1SS is made to attach plywood, soft woods, or composition board to metal, and it will also fasten metal to metal. It drills its own hole and forms its own mating threads in one pass, so no pilot hole or tap is needed.

It is 410 stainless steel, hardened to Rockwell C38-46. That matters because 410 will drill through harder material than 18-8 stainless will. 18-8 has better corrosion resistance but is too soft to cut steel reliably, which is why self-drilling stainless screws are made in 410. These are usually supplied plain, with no added coating.

Torsional strength is 42 lb-in minimum, which is the point at which the shank twists off. Standard practice is a screw gun or drill set to a controlled speed and clutch; a high-torque impact will exceed 42 lb-in easily and break heads off. Minimum torques are the same for stainless and steel self-drill screws, and drill time runs about 2.5 seconds through a 1 mm plate, so let the point cut rather than leaning on it.

A #2 Phillips bit. The recess is 0.182 inch in diameter and 0.11 inch deep, so a #2 seats fully. Using a #1 will cam out and chew the recess, and a #3 will not bottom.

It is a flat countersunk head, 0.285 to 0.312 inch across and 0.084 to 0.100 inch high. In wood or composition board the head pulls itself flush as you drive. Into bare sheet metal with no countersink prep, expect the head to stand slightly proud unless you dimple the panel first.

Metallics lists the JTEKDF1SS as compliant for both Buy American and ARRA. Country of origin is recorded as multiple, so if your specification requires documented domestic melt and manufacture for a specific lot, request the certification for the lot you are shipped.

Dimensions are to ASME B18.6.3-2002 and the thread is to SAE J78 - 2013. Thread count is 18 per inch with a gaging diameter of 0.267 inch, which is the Type BSD spaced-thread drill screw form. Worth knowing for spec work: SAE J78 carries no specification for #7 diameter drill screws, so #8 is the smallest common size you can call out to that standard.

A Type BSD self-drilling and tapping screw drills the hole, cuts the thread, and clamps the joint in one operation. That cuts labor time and largely removes drill bits and taps from the job, which is the main reason electrical and metal-stud crews use them for mounting strut, boxes, and panel work. The tradeoff is the point is sized to a thickness window, so you pick the drill point to the gauge instead of using one bit for everything.

0.44 lbs per jar of 100. Handy if you are building out truck stock or a job kit and need to budget weight per box.