Metallics JQK25V 10 x 3/4 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Steel Zinc - Each

No pilot hole needed in thin sheet metal. The JQK25V is a sharp point self-piercing and tapping screw, so it pierces 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 in the material.

The JQK25V is flagged compliant for both Buy American and ARRA. Country of origin is listed as multiple, which is normal for a fastener line produced across more than one plant.

You have two options on the same screw. The head is a 1/4 inch hex with a slotted drive, so a 1/4 inch nut driver or a flat blade both work. The slot runs 0.045 to 0.054 inch wide and 0.052 to 0.074 inch deep, and the head measures 0.244 to 0.25 inch across with a head height of 0.096 to 0.11 inch.

Yes, the head carries an integral washer face measuring 0.384 to 0.414 inch outside diameter with a thickness of 0.019 to 0.031 inch. That bearing surface spreads the load over the hole, which is what you want when you are fastening straps, clips or covers to thin sheet metal enclosures.

#10 diameter by 3/4 inch long, with 12 threads per inch. The coarse twin lead thread is what lets it tap its own hole rather than needing a machine-threaded hole waiting for it.

They ship as a 500 count jar, and 500 is the order minimum, so it is bought by the jar rather than by the piece. Jar weight is 2.55 lbs. Metallics does make other sizes and quantities in this self-piercing line on request.

These are carbon steel with a zinc plating, which is an indoor and protected-location finish. It handles a dry mechanical room, panel room or ceiling space fine. For outdoor, wet, or corrosive exposure, specify a stainless fastener instead rather than relying on zinc plate.

They are case hardened to Rockwell C28-38 and made from AISI 1018 to 1022 carbon steel, which is what gives the sharp point enough hardness to pierce and tap sheet steel without the tip rolling over. Thicker structural stock is a different job, use a self-drilling point screw there.

No. Head dimensions on self-piercing screws differ from standard tapping screws, and there is no single industry standard governing them. The figures Metallics publishes for the JQK25V, such as the 0.244 to 0.25 inch head width, are a guide and small deviations can occur. If a cover plate or clearance hole is tight, check against an actual sample.