1 - Tightening torques: hydraulic unions with 37° flare
Tensile grade
SAE J 514
Outside diameter
of pipe, metric
Outside diameter
of pipe, in inches
Thread
Torque
mm
inch
inch
Min.
Max.
4
1/8
5/16 - 24 UNF
8 Nm
9 Nm
5
3/16
3/8 - 24 UNF
11 Nm
12 Nm
6
1/4
7/16 - 20 UNF
15 Nm
16 Nm
8
5/16
1/2 - 20 UNF
19 Nm
21 Nm
10
3/8
9/16 - 18 UNF
24 Nm
28 Nm
12
1/2
3/4 - 16 UNF
49 Nm
53 Nm
16
5/8
7/8 - 14 UNF
77 Nm
85 Nm
20
3/4
1-1/16 - 12 UN
107 Nm
119 Nm
22
7/8
1-3/16 - 12 UN
127 Nm
140 Nm
25
1
1-5/16 - 12 UN
147 Nm
154 Nm
32
1-1/4
1-5/8 - 12 UN
172 Nm
181 Nm
(40)
1-1/2
1-7/8 - 12 UN
215 Nm
226 Nm
50
2
2-1/2 - 12 UN
332 Nm
350 Nm
IMPORTANT:
The unions for pipes must not be tightened using a pipe wrench or a torque wrench. Special pipe
wrenches, flat open-end wrenches and Allen keys of the appropriate size must be used to avoid crushing
the pipes and unions and tearing the threads.
2 - Tightening torques: EO2 hydraulic unions
Pipe dimension
10%
mm
6 x 1
17 Nm
8 x 1
25 Nm
10 x 1
35 Nm
12 x 1
45 Nm
12 x 1.5
48 Nm
15 x 1.5
70 Nm
18 x 2
105 Nm
22 x 2
160 Nm
25 x 2
210 Nm
28 x 2
205 Nm
1. Introduction
1-21
ACX2831410
