Pan Washer Head Thread Forming Screw

A thread forming tapping screw with wider spaced threads than a Type-AB and a gimlet point.

A thread forming tapping screw with spaced threads and a gimlet point.

A slotted hex washer head thread forming tapping screw with serrations on the underside of the washer face, spaced threads and a gimlet point.

A thread forming screw with a double-lead, consisting of a high and low thread. The lower thread varies in height from 1/3 to 1/2 that of the higher thread, which is sharper and flatter than a standard thread.

A thread forming tapping screw with spaced threads and a blunt point with incomplete entering threads.

For self starting in thin (.015-.050 thick) metal or resin-filled plywood. 18-8 Stainless steel tapping screws may be used in applications which require general atmospheric corrosion resistance. Fastening stainless steel parts to aluminum or steel can cause a type of corrosion known as a galvanic couple in some environments.

For self starting in thin metal or resin-filled plywood. Recommended over a Type-A, particularly in brittle materials.

The serrations on the underside of the washer face allow this part to perform two main functions: (1) act as a locking fastener, and

(2) break drive torque during installation which lessens the chance of reaming out the mating hole in the bearing surface. The

torque-breaking feature slows the rotation of the screw when it meets the mating surface. The serrations aloow for more pitch

body diameter under the head giving the mating sheet metal more travel so as not to snap over the last bit of major diameter

thread crest. Appliance manufacturers use these screws to reduce the thickness of the sheet metal they require, which reduces the

cost of production.