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▣ JIS B1173 Unit : mm
Diameter M8 M10 M12 (M14) M16 (M18) M20
d3 Tolerance 0
-0.15
0
-0.18
0
-0.21
S Basic 18 20 22 25 28 30 32
Tolerance +1.9
0
+2.2
0
+2.6
0
+3
0
+5
0
t Class1 Basic   12 15 18 20 22 25
Tolerance +1.1
0
+1.3
0
Class2 Basic 11 15 18 21 24 27 30
Class3 Basic 16 20 24 28 32 36 40
Tolerance +1
0
+1.3
0
+1.6
0
L Basic 20-30
32-50
55-80
90-120
140-150
Tolerance ±0.42
±0.5
±0.6
±0.7
±0.8
 
Nominal Size or Diameter of Stud D Tolerances on Stud Lengths-in.
L Equal to 6 in. and Under L Over 6 in.
No. 8 to 5/16 in. incl.
  Over 5/16 in. to 3/4 in.
Over 3/4 in. to 1-1/4 in.
Over 1-1/4 in.
±1/32
±1/16
±1/8
±1/4
±1/16
±1/8
±3/16
±1/4