DRESSTA TD-25M EXTRA - Split Flange Connections; Hydraulic Tubes and Fittings

INTRODUCTION SECTION 1
Page 15
DRESSTA TD-25M EXTRA
STANDARD TORQUES
12. SPLIT FLANGE CONNECTIONS
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.
Flange Size
[in]*
Bolt Size
[in]
Bolt Torque Newton Meter
[Nm]
1/2 5/16 20 - 24
3/4 3/8 30 - 37
1 3/8 37 - 47
1-1/4 7/16 47 - 61
1-1/2 1/2 62 - 79
2 1/2 75 - 88
2-1/2 1/2 107 - 123
3 5/8 187 - 203
3-1/2 5/8 159 - 180
(*) – Inside diameter of hydraulic tube or hose fitting
13. 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. These torques are not recommended for tube
with wall thickness of 0.89 [mm] or less.
Size
Tubing O.D.
[in]
Thread size
[in]
Torque values for
37 [°] flared fittings
[Nm]
Torque values for O-ring boss
plugs, locknuts and 37 [°] flared
fittings [Nm]
4 1/4 7/16–20 12–16 8–14
5 5/16 1/2 –20 16–20 14–20
6 3/8 9/16–18 29–33 20–27
8 1/2 3/4 –16 47–54 34–42
10 5/8 7/8–14 72–79 47–54
12 3/4 1-1/16–12 104–111 81–95
14 7/8 1-3/16–12 122–138 95–109
16 1 1-5/16–12 149–163 108–122
20 1–1/4 1-5/8–12 190–204 129–156
24 1–1/2 1-7/8–12 217–237 163–190
32 2 2-1/2–12 305–325 339–407