TM 5-3895-379-23-2
0284
GENERAL TORQUE VALUES - Continued
Metric 24 O-Ring Seal DIN 20078 Service Recommendations
NOTE
In this style of fittings, there are "heavy" and "light" designs. Usually "heavy" is used for
pressure lines and "light" for return lines.
Some "heavy" and "light" sizes can be threaded together but do not seal properly. Be
sure not to mix "heavy" and "light" fittings.
These fittings are also referred to as EO and EO-2 Bite Type or Ermeto style fittings.
1.
Inspect the fitting sealing surfaces. They must be free of dirt scratches, nicks, and burrs.
2.
Inspect the O-ring. It must be free dirt, cuts, cracks, swelling or flatten condition.
3.
Lubricate O-rings using a thin film of clean oil. Refer to LO 5-3805-294-13.
4.
Align an adjustable fitting with the tube.
5.
Hold connections together while tightening nut to ensure proper seal.
6.
Tighten nut (Figure 25, Item 1) hand tight so O-ring contacts seat and then an additional 1/4-1/3 turn using a
wrench.
1
M1340SWR
Figure 25.
Metric 24 Degree O-Ring Seal DIN 20078.
7.
Table 25 lists the Metric 24 Degree O-Ring Seal DIN 20078 Torque Values.
Table 25.
Metric 24 Degree O-Ring Seal DIN 20078 Torque Values.
Fitting Tube OD Size
Heavy Fitting Size (mm) Light Fitting Size (mm)
Torque (Turns)
(mm)
6
-
M12 x 1.5
Hand tighten so O-ring
contacts seat plus an
additional 1/4-1/3 turn
8
M16 x 1.5
M14 x 1.5
using a wrench.
10
M18 x 1.5
M16 x 1.5
12
M20 x 1.5
M18 x 1.5
14
M22 x 1.5
-
03/15/2011Rel(1.8)root(torquewp)wpno(M00222)