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Metric Bolt Conversion

Approximate Equivalency Chart Metric/US Roughly Equivalent US Bolt Materials


Metric Nut ClassSAE J429 Normally UsedGradesASTM Grades
4.6 4 or 5 1 A307,Grade A
4.8 4 or 5 2 .
5.8 5 2 .
8.8 8 5 A325,A449
9.8 9 5+ A193,B7 and B16
10.9 10 or 12 8 A490,A354, Grade 8D
12.9 10 or 12 . A540;B21 through B24

 

Common DIN Numbers for Metric Fasteners


DINHex Capscrews
931 Coarse thread pitch partially threaded (specify grade)
933 Coarse thread pitch fully threaded (specify grade)
930 Fine thread pitch partially threaded (specify grade)
961 Fine thread pitch fully threaded (specify grade)
DINNuts
934 Hex nuts (specify pitch and class)
985 Nylon insert locknuts (specify pitch and class)
980V All metal locknuts (specify pitch and class)
DIN Washers
125 Flatwashers
127 Lockwashers
DIN Socket Products
912 Socket head capscrews (normally GR 12.9 and coarse thread)
7991 Flat head socket capscrews (normally GR 12.9 and coarse thread)
916 Socket setscrews (normally GR 12.9 and coarse thread)
DIN Machine Screws
7985 Pan head Phillips drive zinc plated
965 Flat head Phillips drive zinc plated
DIN Threaded Rod
975 All threaded rod (normally 1 meter lengths, specify grade and pitch)