Fastener Torque Sequences

ATTENTION:
Risk of equipment damage exists.
Components can be damaged if the tightening procedure is not performed to specification.
These figures illustrate the initial and final torque sequences for components that are fastened to a heatsink by using two, four, and six screws. The initial torque is 1/3 (33%) of the final torque, except six-point mountings, which require a 0.7 N•m (6 lb•in) initial torque. The numeric illustration labels are for your assistance. Drive components do not contain these labels.
Two-point Mounting
Image with callouts of a two-point torquing sequence.
Four-point Mounting
Image with callouts of a four-point torquing sequence.
Six-point Mounting
Image with callouts of a six-point torquing sequence.
Torque Sequences
Item
Description
A
Fastener pattern
B
Initial torque sequence
C
Final torque sequence
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