Tangless CoilThread Inserts
Tangless CoilThread inserts are made of cold-rolled 304 stainless steel wire (AS7245), work-hardened to a tensile strength above 200,000 psi, and a hardness of Rc 43-50. The finished surface (8-16 micro-inches) is exceedingly smooth, virtually eliminating friction-induced thread erosion.
When assembled with STI-tapped holes, Tangless CoilThread inserts form Unified Coarse, or Unified Fine threads that conform to the National Bureau of Standards Handbook H-28, Screw-Thread Standards for Federal Services, Classes 2B and 3B. Assembled Tangless CoilThread inserts will also accommodate UNJ, MIL-S-8879, male threaded fasteners. Metric Tangless CoilThread inserts conform to National Bureau of Standards Handbook H-28/21, M Profile, Tolerance Classes 4H5H or 5H, as well as ISO standards 68, 261, R724 and 965/I. Assembled Metric Tangless CoilThread inserts will also accommodate MJ, AS1370, male threaded fasteners.