John King Chains

19.4 Assembly of Solid Bearing Screwed Pattern Master Links

Chain master links which incorporate a screw thread and locknut fixing should be assembled generally as follows:
1. Secure the chain on both ends at the position of work.
2. Where applicable apply lubricant to chain bearing pin body and threaded end.
3. Introduce new link into adjacent chain pitch points.
4. Position loose link plate over threaded bearing pin end section and support the back face of the chain with a solid object to give support.
5. The loose chain link plate should be a light tap fit on each bearing pin end projection. The link plate should then be lightly tapped up to the shoulder of the pin in equal measure. Introduce the locknuts to the screwed end section of the bearing pin and lightly tighten.
6. Use a torque wrench to fully secure the locknuts.
7. Check chain joint for full articulation after final assembly.
8. Do not use the screwed locknut to position the link plate against the bearing pin shoulder. The locknut is only used to secure the link plate after assembly as above.
9. The following are correct torque setting figures for thread sizes as listed. For other screw thread diameters please enquire or seek local additional information:

TABLE 19.4.1

Thread Size

Tightening Torque

Tightening Torque

Nm

Lb.Ins

M4 – 0.1875”

3.00

26.553

M6 – 0.250”

10.00

88.510

M8 – 0.3125”

25.00

221.270

M10 – 0.375”

50.00

442.540

M12 – 0.500”

94.00

831.975

M16 – 0.625”

225.00

1991.430

M20 – 0.750”

430.00

3805.844

M22 – 0.875”

630.00

5576.000

M25 – 1.00”

774.00

6850.192