Metallics JQK17WV 8 x 1-1/2 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Gray - Steel Zinc - Each

The JQK17WV ships in a jar of 500, and 500 count is also the order minimum, so that jar is the smallest buy. One jar weighs 3.55 lbs.

Either. It's a #8 x 1-1/2 in. screw with a 1/4 in. hex washer head that also has a slot cut in it, so a 1/4 in. magnetic nut setter or a flat blade both drive it. Head width measures 0.244 to 0.25 in. and head height 0.096 to 0.11 in.; the slot runs 0.045 to 0.054 in. wide and 0.052 to 0.074 in. deep, so use a cabinet-tip flat blade rather than a wide carpenter's bit if you go that route.

No pilot hole. The JQK17WV is a sharp point self-piercing and tapping screw, so it punches and forms its own thread in sheet metal. Twin lead threads cut the driving torque, and the undercut under the head gives you more usable thread engagement than a standard tapping screw head allows.

They are heat treated to Rockwell C28-38 and made from AISI 1018 to 1022 carbon steel, which is the usual range for a case hardened piercing screw. The sharp point and 15 TPI thread are intended for thin gauge metal; for thick structural steel you want a self-drilling screw with a drill point instead.

Yes, it is a hex washer head. Washer outside diameter runs 0.322 to 0.348 in. with a washer thickness of 0.019 to 0.031 in. That flange spreads the load on sheet metal and over slotted or oversized holes without adding a loose washer to the job.

Metallics lists the JQK17WV as ARRA compliant and Buy American compliant, with country of origin China. On a federally funded project, confirm which compliance clause your contract actually invokes, since the two standards are not interchangeable.

Not exactly. Metallics states that head dimensions on self-piercing screws differ from standard tapping screws, and that there is no single industry standard for self-piercing screw dimensions, so the published figures are a guide and deviations occur. If you are driving into an existing hole pattern or need a head to seat in a counterbore, check the actual head width of 0.244 to 0.25 in. against what you have.

The screw is zinc plated carbon steel, which is a dry interior finish, fine for indoor boxes, strut, enclosures and panel work. For exterior or wet locations, step up to a stainless or coated exterior fastener.