FASTENER IDENTIFICATION GUIDE
B 8 M X Symbol for identification of grade, i.e., "B8M", applied to head. Line stamped under "B8M". Manufacturer's identification mark, e.g., "X" ( on head of bolts and screws and on one end of studs and stud bolts). ASTM A 307* Grade A Grade B Regular 'series and Heavy Series A or B 67614 B only 67613 Galv. A or B 67614
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