I'd like to ask you about a bolt on a pre-ban I bought some time ago, it reads "7790185" with just a "SA" underneath it. This leaves me to wonder where is the heat treatment code is. Any info will be much appreciated.
Quagmire is correct. The 85 bolts were produced under the drawing number ending in 85, which is a stripped bolt. 85 bolts were produced by SA, HRA, and WRA, but not TRW.
The 86 bolts were produced under the drawing number ending in 86, which treats the bolt as an assembly. With the bolt roller hassles, it was decided to stock, store, inventory and issue them as assemblies.
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