Standard Hollow Type: Dimension and tightening torque table

Standard hollow type

Standard materials and coatings

Size Material Coating
M12–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 (M12–M36)

Unit: millimeters (mm)

Nominal size Pitch Set screw (1) Lock screw (2) Overall height (approx.) Hex socket (both 1 and 2) Hole dia. Unit weight Reference tightening torque (N·m)
(both the set and lock screws) (shared material and strength)
Proof torque (N·m)
H Tolerance 1 H1 Tolerance 2
S, S1 C: Coarse F: Fine B Tolerance A, A1 Tolerance (g)
M12 1.75 1.5 16 ±0.35 ≧2 16 ±0.35 ≧5 29 6 +0.02
+0.14
6 ±0.2 13 27–33 52
M14 2.0 1.5 16 ±0.35 ≧2 16 ±0.35 ≧6 28 6 +0.02
+0.14
6 ±0.2 18 27–33 52
M16 2.0 1.5 20 ±0.42 ≧4 20 ±0.42 ≧8 36 8 +0.03
+0.18
8 ±0.2 29 63–77 120
M20 2.5 1.5 20 ±0.35 ≧5 20 ±0.35 ≧10 35 10 +0.03
+0.18
10 ±0.2 44 90–110 220
M24 3.0 1.5 25 ±0.42 ≧6 25 ±0.42 ≧12 44 12 +0.03
+0.21
12 ±0.2 81 150–190 370
M30 3.5 1.5 30 ±0.42 ≧9 30 ±0.42 ≧15 54 17 +0.03
+0.21
17 ±0.2 134 530–650 980
M36 4.0 1.5 35 ±0.5 ≧8 35 ±0.5 ≧15 63 17 +0.03
+0.21
17 ±0.2 293 530 ~ 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.