Page 27 - SELECTA • FASTENERS PLUS... CATALOG

Mechanical & Performance Requirements
FASTENERS
Self-Tapping Screws s Thread Forming s Type A

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

Applications/ For self starting in thin (.015-.050 thick) metal or resin-filled plywood.
Advantages 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 galvanic
couple in some environments.

Self-Tapping Screws s Thread Forming s Type AB
Description A thread forming tapping screw with spaced threads and a gimlet point.

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

Self-Tapping Screws s Self-Piercing

Description A slotted hex washer head thread forming tapping screw with a single lead
thread rolled to the tip of an extra sharp point, and a second thread spaced
180º apart.

Applications/ May be used in thin metal (less than .050 thick). Eliminates need for pre-
Advantages DRILLED OR PRE PUNCHED HOLES 5NDERCUT AREA BENEATH THE HEAD ALLOWS GREATER
length of thread engagement. Twin lead threads help to reduce driving torque.

SELECTA PRODUCTS, INC. s Tehachapi, CA s Memphis, TN s 800-722-6445 s 800-433-4319 FAX s www.selectainc.com s orders@selectainc.com D-7