Metallics JQK25 10 x 3/4 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Steel Zinc - Each

No pre-drilling. The JQK25 is a sharp point self-piercing and tapping screw, so it pierces and forms its own thread in thin sheet metal as it drives. Twin lead threads cut the driving torque, which matters when you are running a lot of them overhead.

Two options, because the head is both hex and slotted. Drive it with a 1/4 inch hex socket or nutsetter, or use a #8 slotted bit if you can't get a socket into the space. Head width runs 0.244 to 0.25 in. and head height 0.096 to 0.11 in. The slot measures 0.045 to 0.054 wide and 0.052 to 0.074 deep.

It's a #10 diameter by 3/4 inch long screw with 12 threads per inch. The undercut beneath the head gives you more thread engagement in the sheet than a standard tapping screw of the same length.

No. The JQK25 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. If your specification carries a domestic sourcing requirement, you'll need a different fastener.

Yes, this is the standard sheet metal fastener for electrical, plumbing, heating and air conditioning work. Contractors use it for duct seams, strap and hanger attachment, and fastening into enclosures and sheet metal boxes.

There's an integral washer under the head, 0.384 to 0.414 in. outside diameter and 0.019 to 0.031 in. thick, which spreads the clamp load over thin sheet. The finish is zinc plating on steel, which handles indoor and protected locations. Zinc plate is not a marine or long-term weather-exposed coating, so for sustained outdoor exposure look at a stainless or coated fastener instead.

They ship in a jar of 100, which is the order minimum. Jar weight is 0.51 lbs. Other sizes and quantities can be arranged by request.

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. The published figures (head width 0.244 to 0.25 in., head height 0.096 to 0.11 in.) are a guide and small deviations can occur. If the head has to seat in an existing counterbore or under a fixed clearance, check it against the part you're replacing.

Case hardness is Rockwell C28-38, made from AISI 1018 to 1022 low carbon steel. That's hard enough to pierce and tap light gauge sheet without the point rolling over, while keeping enough ductility that the screw doesn't snap off at the head when you drive it.