Special/Thin Hollow Type: Dimension and tightening torque table

Special/Thin Hollow Type

Standard materials and coatings

Size Material Coating
M14–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) Unit weight Reference tightening torque (N·m)
(both the set and lock screws) (shared material and strength)
Proof torque
H Tolerance H1 Tolerance
S, S1 Fine B Tolerance (g)
M12 1.5 10 ±0.29 10 ±0.29 17 6 +0.02
+0.14
7 27–33 52
M14 1.5 10 ±0.29 10 ±0.29 17 6 +0.02
+0.14
12 27–33 52
M16 1.5 10 ±0.29 10 ±0.29 17 8 +0.03
+0.18
15 63–77 120
M18 1.5 10 ±0.29 10 ±0.29 17 8 +0.03
+0.18
16 63–77 120
M20 1.5 12 ±0.35 12 ±0.35 20 10 +0.03
+0.18
28 90–110 220
M24 1.5 12 ±0.35 12 ±0.35 20 12 +0.03
+0.21
35 150–190 370
M30 1.5 12 ±0.35 12 ±0.35 20 17 +0.03
+0.21
57 530–650 980
M36 1.5 18 ±0.35 18 ±0.35 31 17 +0.03
+0.21
162 530–650 980

• 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.