STANDARD BOLT IDENTIFICATION MARKINGS
1⁄4 thru 4 −− −− Low‐ or Medium‐ Carbon Steel 1⁄4 thru 3⁄4 Over 3⁄4 thru 1 ½ 55,000 33,000 57,000 36,000 74,000 60,000 ASTM A193 Grade B5 Bolts, Screws, Studs for High‐ Temperature Service ASTM A193 Grade B6 Bolts, Screws, Studs for High‐ Temperature Service ASTM A193 Grade B7 Bolts, Screws, Studs for
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STANDARD BOLT IDENTIFICATION MARKINGS
www.aptp.comGrade 1 No Grade Mark Bolts, Screws, Studs 60,000 Bolts, Screws, Studs ASTM A307 Grades A&B 60,000 STANDARD BOLT IDENTIFICATION MARKINGS Identification Grade Mark Specification Fastener Description Material Nominal Size Range (in.) This technical information is supplied as a courtesy.
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