Metallics QK254M5V 10 x 3/4 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Steel Zinc - Each

No pilot hole needed. The QK254M5V is a sharp point self-piercing and tapping screw, so it pierces thin sheet material and forms its own thread as it drives. Twin lead threads cut the driving torque, and the undercut under the head gives you more thread engagement once seated.

They ship in a box at a 4500 piece minimum, so it is a bulk jobsite or stockroom quantity rather than a handful. Total box weight is 22.95 lbs.

The QK254M5V is flagged as both ARRA compliant and Buy American compliant in the manufacturer data, with country of origin recorded as multiple. If your spec requires documented domestic origin on a specific shipment, that is confirmed at the lot level.

It takes a 1/4 inch hex driver or a flat blade. The head measures 0.244 to 0.25 in. across and 0.096 to 0.11 in. high, with a slotted drive 0.045 to 0.054 in. wide and 0.052 to 0.074 in. deep, so a standard 1/4 in. magnetic nut setter seats cleanly and the slot gives you a hand-screwdriver backup in tight work.

They are the general fastening screw for electrical, plumbing, heating and air conditioning work: hanging strap and clamps, securing boxes and brackets, duct and sheet metal attachment. The #10 x 3/4 in. length with 12 threads per inch suits thin-gauge sheet and light channel where the screw forms its own thread.

The head includes a washer face 0.384 to 0.414 in. outside diameter and 0.019 to 0.031 in. thick, which spreads bearing load over a pierced hole in thin sheet so the head does not pull through. It is a bearing surface, not a gasket, so it is not a weather seal.

The QK254M5V is steel with a zinc finish. Zinc plating handles indoor and sheltered damp conditions, but it is not a stainless or hot-dip coating, so for sustained exterior exposure or corrosive wash-down areas choose a stainless or galvanized fastener instead.

Case hardness is Rockwell C28-38 on AISI 1018 to 1022 steel, which is what lets the sharp point pierce and tap thin-gauge steel without a pilot. That hardness is aimed at light sheet and strap work, not at thick structural steel, where a self-drilling point with a heavier core is the right call.

Order Metallics QK254M5V, from the JQK series of self-piercing and tapping screws: #10 diameter, 3/4 in. long, 12 TPI, 1/4 in. slotted hex washer head, sharp point, steel with zinc finish. Other sizes and quantities in the series are available by request.

Not directly. 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 (0.244 to 0.25 in. head width, 0.096 to 0.11 in. head height) are a guide and small deviations occur. If a fixture has a tight counterbore, verify against the part in hand.