Page 22
25-20-00
Martin-Baker
MB680
MISSION SEAT ETSO
MAINTENANCE MANUAL
TABLE 2: SELF-LOCKING NUTS ON
BOLTS OR SCREWS
Type Thread Size AF
Standard Torque Load
(SI Units - Nm)
Standard Torque Load
(Imperial Units - lbf/in.)
H42-L02 2-56 UNC 1/8 in. 0.4 - 0.6 Nm 4 - 5 lbf/in.
H42-L04 4-40 UNC 5/32 in. 0.8 - 1.0 Nm 7 - 8 lbf/in.
H42-L06 6-32 UNC 3/16 in. 1.4 - 1.6 Nm 12 - 14 lbf/in.
H42-L08 8-32 UNC 7/32 in. 2.6 - 2.8 Nm 22 - 25 lbf/in.
H42-3 10-32 UNF 1/4 in. 3.6 - 4.0 Nm 32 - 36 lbf/in.
H42-4 1/4-28 UNF 5/16 in. 10.2 - 11.0 Nm 90 - 96 lbf/in.
H42-5 5/16-24 UNF 3/8 in. 19.0 - 20.5 Nm 170 - 180 lbf/in.
H42-6 3/8-24 UNF 7/16 in. 38.5 - 41.0 Nm 340 - 360 lbf/in.
H42-7 7/16-20 UNF 1/2 in. 55.5 - 59.0 Nm 490 - 520 lbf/in.
H42-8 1/2-20 UNF 9/16 in. 82.5 - 87.0 Nm 730 - 750 lbf/in.
TABLE 3: SELF-LOCKING NUTS ON STUDS IN ALUMINIUM ALLOY
Type Thread Size AF
Standard Torque Load
(SI Units - Nm)
Standard Torque Load
(Imperial Units - lbf/in.
H42-L04 4-40 UNC 5/32 in. 0.5 - 0.6 Nm 4 - 5 lbf/in.
H42-L06 6-32 UNC 3/16 in. 0.9 - 1.0 Nm 8 - 9 lbf/in.
H42-L08 8-32 UNC 7/32 in. 1.8 - 2.0 Nm 16 - 18 lbf/in.
H42-3 10-32 UNF 1/4 in. 2.3 - 2.6 Nm 20 - 23 lbf/in.
H42-4 1/4-28 UNF 5/16 in. 8.0 - 8.6 Nm 70 - 76 lbf/in.
H42-5 5/16-24 UNF 3/8 in. 14.0 - 15.6 Nm 126 - 136 lbf/in.
H42-6 3/8-24 UNF 7/16 in. 22.5 - 25.0 Nm 200 - 220 lbf/in.
H42-7 7/16-20 UNF 1/2 in. 30.5 - 34.0 Nm 270 - 300 lbf/in.
H42-8 1/2-20 UNF 9/16 in. 45.0 - 50.0 Nm 400 - 440 lbf/in.
TABLE 4: STUDS (THAT BOTTOM OUT) IN ALUMINIUM ALLOY
Thread Size
Torque Load
SI Units - Nm)
Torque Load
(Imperial Units - lbf/in.)
4-40 UNC 0.5 - 0.6 Nm 5 - 6 lbf/in.
6-32 UNC 1.0 - 1.1 Nm 9 - 10 lbf/in.
8-32 UNC 2.0 - 2.3 Nm 18 - 20 lbf/in.
10-32 UNF 2.5 - 2.9 Nm 22 - 26 lbf/in.
1/4-28 UNF 8.8 - 9.4 Nm 78 - 84 lbf/in.
5/16-24 UNF 15.6 - 16.8 Nm 138 - 150 lbf/in.
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