HARDLOCK Set Screw - Tightening Torque

hls tightening torque table

Size Pitch Reference tightening torque (N·m)
Both concave (setting) and convex (lock) screws Proof torque
M8 Coarse 9 ~ 10 16
M10 Coarse 17 ~ 20 30
M12 Coarse･Fine 29 ~ 34 52
M14 Coarse･Fine 29 ~ 34 52
M16 Coarse･Fine 66 ~ 78 120
M18 Coarse･Fine 66 ~ 78 120
M20 Coarse･Fine 121 ~ 143 220
M22 Coarse･Fine 204 ~ 241 370
M24 Coarse･Fine 204 ~ 241 370
M30 Coarse･Fine 539 ~ 637 980
M36 Coarse･Fine 539 ~ 637 980
Note: The concave (setting) screw can be tightened to the torque required for the target application (low or high)

Installation procedure and handling precautions

  1. Tighten the concave (setting) screw with the torque required for the target application. The convex (lock) screw must be tightened to the HARDLOCK specified torque.
  2. Refrain from using tools that are the wrong size, worn out or otherwise improper. Using such tools may result in damage during tightening.
  3. The HLS should not be welded. Doing so reduces the screw strength.
  4. Do not apply surface treatment or coating without guidance from HARDLOCK. The HLS is heat treated, and surface treatments may cause degradation in strength or hydrogen embrittlement.