Question on early bolts

[RCS]

Attachment 30941Attachment 30940When did SA discontinue polishing the bolt face and rear area of the bolt locking lugs ?

Received a data sheet from Joe W. on s/n 511125 that has a polished bolt face and rear locking lug area. Most data sheets will not indicate if this was done.

Photo show examples of two new revision 2 bolts J9A and RE2 with the polished areas

Information

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[cgroc09]

522,731 (lend lease) has a polished face and rear lugs.

[RCS]

Ever see any revision 1 bolts with a polished bolt face or rear lug area ?

[cgroc09]

Have not seen a rev. 1 bolt with polished lugs. The -2 bolts have a heat lot of REP2, REC5