BSI BS A 232 Specification for 100 Degree Countersunk Head Steel Bolts (160 000 Lbf/Square Inches (110 hbar) with Torq-Set Recesses) - AMD 197: January 30, 1969; AMD 1108: February 7, 1973; AMD 2131: October 29, 1976; AMD 2813: April 30, 1979
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