Standard Normal Type: Dimension and tightening torque table

Standard normal type

Standard materials and coatings

Size Material Coating
M8–M20 Class 10/chromium molybdenum steel (JIS SCM435)/hardness HRC 45–53 Black oxide
M22–M36 Class 8/medium-carbon steel (JIS S45C)/hardness HRC 30–43 Black oxide

Please contact us for other coating options.

Dimension and tightening torque table (M8–M36)

Unit: millimeters (mm)

Nominal size Pitch Set screw (1) Lock screw (2) Overall height (approx.) Hex socket (both 1 and 2) Unit weight Reference tightening torque (N·m)
(both the set and lock screws)
Proof torque (N·m)
H Tolerance 1 H1 Tolerance 2
S, S1 C: Coarse F: Fine B Tolerance (g)
M8 1.25 / 10 ±0.29 ≧2.5 10 ±0.29 ≧5 17.5 4 +0.02
+0.10
4 9–11 16
M10 1.5 / 12 ±0.35 ≧3 12 ±0.35 ≧6 21 5 +0.02
+0.14
8 16–20 30
M12 1.75 1.5 16 ±0.35 ≧5 16 ±0.35 ≧8 29 6 +0.02
+0.14
16 27–33 52
M14 2.0 1.5 16 ±0.35 ≧4 16 ±0.35 ≧8 28 6 +0.02
+0.14
22 27–33 52
M16 2.0 1.5 20 ±0.42 ≧6 20 ±0.42 ≧10 36 8 +0.03
+0.18
37 63–77 120
M18 2.5 1.5 20 ±0.42 ≧6 20 ±0.42 ≧10 36 8 +0.03
+0.18
47 63–77 120
M20 2.5 1.5 20 ±0.42 ≧7 20 ±0.42 ≧12 35 10 +0.03
+0.18
52 90–110 220
M22 2.5 1.5 25 ±0.42 ≧10 25 ±0.42 ≧15 45 12 +0.03
+0.18
79 150–190 370
M24 3.0 1.5 25 ±0.42 ≧9 25 ±0.42 ≧15 44 12 +0.03
+0.21
95 150–190 370
M30 3.5 1.5 30 ±0.42 ≧9 30 ±0.42 ≧15 54 17 +0.03
+0.21
161 530–650 980
M36 4.0 1.5 35 ±0.5 ≧8 35 ±0.5 ≧15 63 17 +0.03
+0.21
368 530–650 980

• External dimensions: Hex socket set screws JIS B1177(2007)/ISO 4026
• Screw thread tolerance: JIS B0209(2001)/ISO 965 6g
• The reference tightening torque is calculated at approximately 60% of the hex wrench proof load. (JIS B4648)
• Be advised that the dimensions and other specifications are subject to change without notice.