21. STANDARD TIGHTENING TORQUES
21.3 HYDRAULIC TUBES AND FITTINGS
The torque figures are recommended for plain, cadmium or zinc plated fittings, dry or wet installations. Swivel nuts
either swaged or brazed. Figures are for tube nuts used with 37” flared fittings and JIC - 37” seat O-Ring boss plugs
and swivel nuts.
21.4 HOSE CLAMPS 21.5 SPLIT FLANGE CONNECTIONS
The following chart provides the tightening torques for
hose clamps used in all rubber applications (radiator, air
cleaner, operating lever boots, hydraulic system, fuel
systems etc.).
The following chart provides the tightening torques for
split flange connections used in hydraulic systems.
Flanges and fitting shoulders should fit squarely. Install
all bolts, finger tight, then torque evenly. Over torquing
bolts will damage the flanges and/or bolts, which may
cause leakage.
I
TORQUE f 0.6 Nom (5 Ibf in)
CLAMP
RADIATOR, AIR
TYPE AND
CLEANER, BOOTS,
SIZE
HYDRAULIC
SYSTEM
Nom 1 Ibf in
T Bolt
Worm Drive -
1-X in Open
Diameter
and Under
Worm Drive
- Over 1-X in
Open Diame-
ter
Worm Drive -
All Ultra-Tite
6.2 to 7.3
2.2 to 3.3
4.5 to 5.6
10.7 to 112
55 to 65
20 to 30
40 to 50
95 to 105
4.5 to 5.6
4.5 to 5.6
-_--_
40 to 51
40 to 5(
FLANGE
SIZE
112
BOLT
SIZE
5/l 6
BOLT TORQUE
Nom Ibfft
20 to 24 15tol8
II
314
I
318 1 30 to 37 1 22 to 27 11
1 318 37 to 47 27 to 35
l-l/4 7116 47 to 61 35 to 45
l-l/2 II2 62 to 79 46 to 58
II 2 I “2
l 75 to 88 1 55 to 65 11
3-l 8
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