Page 21
25-20-00
MB680
Martin-BakerMISSION SEAT ETSO
MAINTENANCE MANUAL
TABLE OF TO
RQUE LOADS
GENERAL
1 If the torque load is not specified in the maintenance procedure, use the standard torque load specified
in Table 1 thru Table 6. Calculate the torque load for a self locking nut as follows:
- Measure the running torque when you install the self locking nut.
- Torque load = standard torque load + measured running torque.
2 If the torque load is specified in the maintenance procedures, use the specified torque load. Calculate
the torque load for a self locking nut as follows:
- Measure the running torque when you install the self locking nut.
- Torque load = specified torque load + measured running torque.
RUNNING AND BREAKAWAY TORQUES
3 The running and breakaway torques are specified in Table 1:
NOTES
(1) Maximum Running Torque - The highest permitted self-locking torque measured during the installation
or removal of a nut, with no axial load on the base of the nut. Do not use a nut that has a running torque
more than the maximum specified in the tables.
(2) Minimum Breakaway Torque - The torque necessary to start a nut to turn counter-clockwise from a
fixed position with no axial load on the base of the nut. Measure minimum breakaway torque during
installation. Do not use a nut that has a breakaway torque less than the minimum specified in the tables.
TORQUE LOAD TABLES
:
TABLE 1: RUNNING AND BREAKAWAY TORQUES
Type Thread Size AF Maximum Running Torque Minimum Breakaway Torque
H42-L02 2-56 UNC 1/8 in. 0.3 Nm (2.5 lbf/in.) 0.02 Nm (0.2 lbf/in.)
H42-L04 4-40 UNC 5/32 in. 0.6 Nm (5.0 lbf/in.) 0.06 Nm (0.5 lbf/in.)
H42-L06 6-32 UNC 3/16 in. 1.1 Nm (10.0 lbf/in.) 0.11 Nm (1 lbf/in.)
H42-L08 8-32 UNC 7/32 in. 1.7 Nm (15.0 lbf/in.) 0.17 Nm (1.5 lbf/in.)
H42-3 10-32 UNF 1/4 in. 2.0 Nm (18.0 lbf/in.) 0.23 Nm (2.0 lbf/in.)
H42-4 1/4-28 UNF 5/16 in. 3.4 Nm (30.0 lbf/in.) 0.40 Nm (3.5 lbf/in.)
H42-5 5/16-24 UNF 3/8 in. 6.8 Nm (60.0 lbf/in.) 0.70 Nm (6.5 lbf/in.)
H42-6 3/8-24 UNF 7/16 in. 9.0 Nm (80.0 lbf/in.) 1.10 Nm (9.5 lbf/in.)
H42-7 7/16-20 UNF 1/2 in. 11.0 Nm (100.0 lbf/in.) 1.60 Nm (14.0 lbf/in.)
H42-8 1/2-20 UNF 9/16 in. 17.0 Nm (150.0 lbf/in.) 2.00 Nm (18.0 lbf/in.)
To Next Page
Loading...