TM 1-1500-204-23-2
Table 4-5. Torque Values for MS21921 Coupling Nut Based on Lubrication Method, or Dry (Lubrication -
None) as Directed in Applications Column and Appropriate Lubricant Column, Table 4-6 - CONT
Tube
Code1
Alum (6061-T6) tubing
wall thickness (in)
heavy
thin
Torque (lb in.)
min.
max.
-20
-20
D
0.049
1000
1100
-20
A, B
1520
1680
-20
-24
-24
-24
A, B
1900
2100
-24
-32
-32
-32
A, B
2660
2940
-32
A Steel, corrosion-resistant or titanium nut tube or fitting.
B Aluminum fittings or nuts used with cres tubing.
C Aluminum fittings or nuts used with heavy wall aluminum tubing (6061-T6).
D Aluminum fittings or nuts used with thin wall aluminum tubing (6061-T6).
Table 4-6. Packing and Lubricant Selection.
Application
Hydraulic (Petroleum Base)
Hydraulic (Phosphate Ester)
Pneumatic
Engine Lubricant (Petroleum Base)
Engine Lubricant (Synthetic Base)
Engine fuel (Gasoline: JP-3, -4,
-5, -6; RJ-1; RP-1; HEF-2)
Oxygen
Vacuum
Coolant (Ethylene Glycol)
Coolant (Silicate Esters)
Specification number
MS28778,
MIL-R-83248/1,
MS 3393, MIL-R-83248/2
NAS1612
MS 9385
MS 9387
MS 9385
NAS 1596
MS28778
Appropriate lubricant
System Fluid
System Fluid
MIL-G-4343
System Fluid
None
None
None
4-22
