TM 5-3805-261-20
APPENDIX E. (cont.)
TORQUE LIMITS. (cont.)
d.
TABLE E-4. TORQUE LIMITS FOR AIR FITTINGS, HOSE CLAMPS AND PLUGS.
(1) SAE Flareless Fitting. Bottom tube into fitting body and tighten nut until sleeve grips tube firmly enough to
prevent movement. Tighten nut 1 to 1 1/4 additional turn. For reassembly, tighten until a sharp rise in
torque is felt, then tighten an additional 1/6 to 1/3 turn.
(2) High-duty (Shear Sleeve) Tube Fittings. Bottom tube into the fitting body and tighten nut until a slight
yield is felt, indicating that the sleeve has been sheared from the nut. Tighten nut an additional 1/2 turn.
(3) Flex Fittings. Slide nut and sleeve over tubing. Bottom tube in counterbore of fitting body. Tighten nut
until it bottoms on hex part of fitting body.
TABLE E-4.
TORQUE LIMITS FOR FLARELESS FITTINGS
Tube O.D.
Torque for Non-Metallic
Optional Turn Tightening--
(Inch)
and Copper Tubing
Turns After Finger Tightening
LB-IN
Tubing
Tubing
Non-Metallic
Copper
.250
75-125
3 Turns
2 Turns
.375
150-200
4 Turns
2 Turns
.500
250-350
4 Turns
2 Turns
.625
300-400
3 1/2 Turns
3 Turns
.750
400-500
3 1/2 Turns
3 Turns
E-4
