Metallics JQK21 10 x 1-1/4 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Steel Zinc - Each

No. The JQK21 is a sharp point self-piercing and tapping screw, so it pierces and forms its own thread in sheet metal without a pilot hole. Twin lead threads cut the driving torque, which matters when you are running a lot of them overhead into studs or box brackets.

Two options on the same screw. The head is a 1/4 inch hex measuring 0.244 to 0.25 inch across, so a 1/4 inch hex driver or nutsetter fits it, and the head is also slotted (slot width 0.045 to 0.054 inch, depth 0.052 to 0.074 inch) if you want to drive or back it out with a flat blade screwdriver.

It is a #10 diameter by 1-1/4 inch long screw with 12 threads per inch. That length gives you enough reach to go through a strap or bracket and still bite the sheet metal behind it; the undercut under the head adds usable thread engagement compared with a standard tapping screw head.

The screw is case hardened to Rockwell C28-38 and made from AISI 1018 to 1022 steel, which is what lets the sharp point pierce and form threads in sheet metal rather than stripping. It is a steel screw with zinc plating, so it is intended for dry interior electrical work, not wet or corrosive exposure.

Yes, the head has an integral washer measuring 0.384 to 0.414 inch outside diameter and 0.019 to 0.031 inch thick, with overall head height of 0.096 to 0.11 inch. That washer face spreads the load on thin sheet metal and over slotted or oversized holes in strap and brackets.

The JQK21 is flagged compliant for both ARRA and Buy American, with country of origin recorded as multiple. If your specification requires documentation on a per-lot basis, request it against the part number JQK21.

Not necessarily. Head dimensions on self-piercing screws differ from standard tapping screws, and there is no single industry standard for self-piercing screw dimensions, so the published values are a guide and some deviation can occur. If your clip, strap, or recess depends on an exact head profile, size it against the stated 0.244 to 0.25 inch hex width and 0.096 to 0.11 inch head height rather than assuming it matches a conventional #10 tapping screw.

They ship in a jar of 100, which is the order minimum (100 count). The packed jar weighs 0.82 lbs. Handy for a van stock item or an MRO shelf where you want a counted quantity rather than a bulk box.

The JQK series is offered in other sizes and quantities by request. The JQK21 itself is the #10 by 1-1/4 inch hex head slotted sharp point version in steel zinc.