Metallics JQK22 10 x 1-1/2 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Steel Zinc - Each

No pilot hole needed in sheet metal. The JQK22 is a sharp point self-piercing and tapping screw, so the point pierces the material and the thread taps its own hole as you drive. Twin lead threads cut driving torque, which helps when you are running a lot of them overhead or into light gauge steel.

It takes a 1/4 inch hex socket. The head is hex with a measured width across flats of 0.244 to 0.250 in. and a head height of 0.096 to 0.110 in. There is also a slotted drive cut in the top, slot width 0.045 to 0.054 and slot depth 0.052 to 0.074, so a flat blade screwdriver works when a socket will not reach.

The JQK22 is flagged compliant for both Buy American and ARRA. Country of origin is listed as multiple, so if your specification demands a single documented origin, confirm the origin on the lot you receive.

12 threads per inch, on a #10 diameter shank 1-1/2 inches long. The area under the head is undercut, which gives you more thread engaged in the material than the raw length suggests.

It stands off. The head has an integral washer face with an outside diameter of 0.384 to 0.414 in. and a washer thickness of 0.019 to 0.031 in., so it bears on the surface rather than countersinking. That spread is what lets it hold thin sheet or a strap without pulling through, but it will not sit flush in a counterbored hole.

They ship in a jar of 100, and 100 count is the order minimum. Other sizes and quantities are available by request.

The JQK22 is carbon steel with a zinc plated finish. Zinc plating handles indoor and sheltered conditions, dry mechanical spaces, ceiling grid and interior duct or strut work. For direct weather exposure, coastal air, or anywhere washdown chemicals hit the fastener, go to a stainless or hot dip galvanized fastener instead.

Case hardness runs Rockwell C28-38 on AISI 1018 to 1022 steel. That is a sheet metal and light gauge fastener, it taps its own thread in thin stock. It is not a self-drilling screw for structural plate or heavy bar, which needs a drill point and higher case hardness. For thicker material, drill and use a tapping screw or a bolted connection.

No. Head dimensions on self-piercing screws differ from standard tapping screws, and there is no single industry standard for self-piercing screw dimensions. The figures given for the JQK22 are a guide and some deviation can occur, so if a hole or a grommet has to match the head exactly, measure a sample rather than working off a tapping screw chart.