Textron Aviation 680A - Page 34

Page 23
25-20-00
MB680
Martin-BakerMISSION SEAT ETSO
MAINTENANCE MANUAL
3/8-2
4 UNF 25.0 - 27.4 Nm 220 - 240 lbf/in.
7/16-20 UNF 34.0 - 37.0 Nm 300 - 330 lbf/in.
1/2-20 UNF 50.0 - 55.0 Nm 440 - 485 lbf/in.
TABLE 5: NUTS ON RIGID AND FLEXIBLE HOSES AND PIPE COUPLINGS (STEEL FITTINGS)
Type Thread Size AF Minimum Torque Load Maximum Torque Load
- 4 7/16-20 UNF 9/16 in. 15.5 Nm (135 lbf/in.) 16.0 Nm (150 lbf/in.)
- 5 1/2 UNF 5/8 in. 19.2 Nm (170 lbf/in.) 22.5 Nm (200 lbf/in.)
- 6 9/16 UNF 11/16 in. 30.5 Nm (270 lbf/in.) 34.0 Nm (300 lbf/in.)
TABLE 6: NUTS ON RIGID AND FLEXIBLE HOSES AND PIPE COUPLINGS (ALUMINIUM FITTINGS)
Type Thread Size AF Minimum Torque Load Maximum Torque Load
- 3 20 UNF 7/16 in. 3.0 Nm (25 lbf/in.) 3.9 Nm (35 lbf/in.)
- 4 7/16-20 UNF 9/16 in. 6.0 Nm (50 lbf/in.) 7.4 Nm (65 lbf/in.)
- 5 1/2 UNF 5/8 in. 8.0 Nm (70 lbf/in.) 10.2 Nm (90 lbf/in.)
TABLE 4: STUDS (THAT BOTTOM OUT) IN ALUMINIUM ALLOY
Thread Size
Torque Load
SI Units - Nm)
Torque Load
(Imperial Units - lbf/in.)
ICA-680A-25-80003A
Sep 4/2020