Metallics JQK30 10 x 1 in. 1/4 Hex Head Slotted Sharp Point Self-Piercing & Tapping Screws - Steel Zinc - Each

No. The JQK30 is a sharp point self-piercing and tapping screw, so it pierces and forms its own thread in sheet metal without a pre-drilled hole. Twin lead threads cut the driving torque, which is what keeps it from walking or stalling when you start it on light gauge steel.

Two choices, because the head is dual drive. The hex head measures 0.244 to 0.250 in. across, so a 1/4 in. nut driver or hex socket seats it. It is also slotted, with a slot width of 0.045 to 0.054 in. and slot depth of 0.052 to 0.074 in., taking a #8 slotted driver. Electricians usually run the hex for speed and keep the slot for tight spots where a socket will not fit.

No. The JQK30 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your spec carries a domestic sourcing clause, this screw will not satisfy it.

It is a #10 diameter screw, 1 inch long, with 12 threads per inch. The undercut beneath the head gives you more usable thread length than a standard tapping screw of the same nominal length, so more of that inch actually engages the material.

It is case hardened to Rockwell C28-38 and made from AISI 1018 to 1022 steel, which is the standard range for a self-piercing fastener driven into light gauge sheet. That hardness is what lets the sharp point form its own hole rather than skate.

Yes, the head carries an integral washer with a 0.384 to 0.414 in. outside diameter and 0.019 to 0.031 in. thickness. That spreads the clamp load wider than the 1/4 in. hex alone, which matters when you are fastening thin strap, box ears, or duct flange and do not want the head pulling through.

They ship in a jar of 100, and 100 is the order minimum. The jar runs 3 x 3 x 2.15 in. and weighs 0.61 lbs, so it drops into a tool bag or a van bin without repacking.

Head height is 0.096 to 0.11 in., so the profile sits low. Worth knowing if a cover plate, panel, or piece of trim has to lay flat over the fastener. Note that self-piercing screw head dimensions are not the same as standard tapping screw heads, and there is no single industry standard for them, so treat these as guide values.