Originally Posted by
lysander
Black oxide vs black phosphate.
If your dealing with quality spring pins, you are dealing with either ASME B18.8.2 or NASM16562 spring pins (tubular slotted). The two specifications are comparable in regards to strength, and quality. The major differences are B18.8.2 has more sizes available and the finish specified.
NASM16562 allows three types of finish, phosphate, cadmium, or passivated CRES. B18.8.2 does not specify any finish, allowing the purchaser to request any finish desired. Normally, for steel pins, that black oxide.
B18.8.2 also discusses beryllium copper spring pins.
Is phosphate superior to the ASME B18.82 finishes?
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