Metallics QK16W8M 8 x 1-1/4 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Gray - Steel Zinc - Each

The QK16W8M sharp point self-piercing and tapping screw ships in a box quantity of 8,000 pieces, which is also the order minimum. That is a bulk carton, not a handful of screws, so it suits crews standardizing one fastener across a lot of openings or a long run of work rather than a one-off repair.

No pilot hole needed in thin sheet material. The QK16W8M has a sharp point that pierces and taps its own thread as it drives, and the twin lead threads cut driving torque. The screw body is hardened to Rockwell C28-38 from AISI 1018-1022 steel, which is what lets the point bite rather than skate.

It is a #8 diameter screw, 1-1/4 inches long, at 15 threads per inch. The 1-1/4 inch length is the figure to check against your stack-up: you need enough of it past the material to get full thread engagement in the substrate once the point has pierced through.

Metallics lists the QK16W8M as both Buy American compliant and ARRA compliant, which is what a government, school district or municipal procurement officer needs on the submittal. Country of origin is listed as multiple.

Two options, which is the point of this head. It is a 1/4 inch hex head measuring 0.244 to 0.25 inch across, so a 1/4 inch nutdriver or hex socket fits it; it also has a slot across the top, 0.045 to 0.054 inch wide and 0.052 to 0.074 inch deep, so a flat blade works where you cannot get a socket in. Head height runs 0.096 to 0.11 inch.

Yes, there is an integral washer under the hex head with an outside diameter of 0.322 to 0.348 inch and a thickness of 0.019 to 0.031 inch. That spreads load on sheet metal and thin panels so the head does not pull through. There is also an undercut beneath the head, which gives more usable thread length on the shank.

The QK16W8M is steel with a zinc finish. Zinc plating is a general corrosion coating suited to dry interior and protected work, electrical boxes, raceway, framing and panel fastening. For sustained weather exposure, wet locations or coastal air, specify a stainless or heavier coated fastener instead.

No. Head dimensions on self-piercing screws differ from standard tapping screws, and there is no single industry standard governing self-piercing screw dimensions. Metallics publishes the QK16W8M figures as a guide, and deviations can occur. If you are matching an existing hole prep or a countersink, work from the stated head range of 0.244 to 0.25 inch across and 0.096 to 0.11 inch high rather than a generic tapping screw table.

A box runs 45.57 lbs and measures 11.5 by 11.5 by 10.75 inches. Worth knowing before you send one up a lift or stage it on a floor, and worth splitting into smaller buckets for the crew.

The QK16W8M is the #8 by 1-1/4 inch hex head slotted sharp point screw in the Metallics JQK series. Metallics states that other sizes and quantities in this line are available by request, so if you need a shorter or longer screw in the same head and point style, it can be sourced within the series.