ISO 9974 Part 3: Stud ends with metal-to-metal sealing (type B)
ISO 9974-3:1996 specifies dimensions, performance requirements and test procedures for heavy-duty (S series), light-duty (L series) and extra-light-duty (LL series) stud ends with ISO 261 threads and metal-to-metal sealing, which also known as Cutting Face or Type B. This design creates a seal by means of a sharp “cutting face” at the base of the male thread that cuts into the flats or “spotface” surrounding the port when the fitting is threaded and tightened.
Except for Metric (ISO 9974- 3), cutting Face Type B is available in BSPP (ISO 1179-4) too , although it is commonly mis-identified as regular BSPP or Metric port fitting with the seal missing. Look for a raised outer section on the male fitting where the bonded washer or seal would go; if it exists this indicates the fitting is Cutting Face.
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