TORQUE LIMITS - TM-9-2320-302-20-21021

TM 9-2320-302-20-2

TORQUE LIMITS

SCOPE

This work package lists standard torque values and provides general information for applying torque. Special torque val-

ues and tightening sequences are indicated in the maintenance procedures for applicable components.

GENERAL

Always use torque values listed in Table 1 when a maintenance procedure does not give a specific torque value.

Unless otherwise indicated, standard torque tolerance shall be 10%.

Torque values listed are based on clean, dry threads. Reduce torque by 10% when engine oil is used as a lubricant.

Reduce torque by 20% if new plated cap screws are used.

Cap screws threaded into aluminum may require reductions in torque of 30% or more of Grade 5 cap screw torque. Cap

crew threaded into aluminum must also attain two cap screw diameters of thread engagement.

If the maintenance procedures do not specify a tightening order, use the following guides:

Unless otherwise specified, lubricate threads of fasteners with oil (Item 21 or 22, WP 0305 00).

When tightening fasteners above 30 lb-ft (41 Nm), use the torque pattern but only tighten to 70 percent of final

value (multiply final value by 0.7). Repeat pattern until final value is reached.

Tighten circular patterns using circular torque pattern. Tighten straight patterns using straight torque pattern.

CAUTION

If replacement cap screws are of higher grade than originally supplied, use torque specifications for the orig-

inal. This will prevent equipment damage due to overtorquing.