49 CFR Part 231 - RAILROAD SAFETY APPLIANCE STANDARDS

Source:
33 FR 19663, Dec. 25, 1968, unless otherwise noted.
Note:

Where rivets or bolts are required in this part 231 a two-piece steel rivet may be used consisting of:

(a) A solid shank of one-half ( 1/2) inch minimum diameter steel or material of equal or greater strength having cold forged head on one end, a shank length for material thickness fastened, locking grooves, breakneck groove and pull grooves (all annular grooves) on the opposite end.

(b) A collar of similar material which is cold swaged into the locking grooves forming a head for the opposite end of item (a) after the pull groove section has been removed.