Installation and Maintenance Manual

GEI-56128H
15
X. TIGHTENING TORQUE FOR SAE HARDWARE
General Notes related to fasteners:
1. Medium carbon steel fasteners per ASTM A449 Type 1.
2. Stainless steel fasteners per ASTM F593.
3. Threaded holes in parts for fasteners are per System 21, ASME/ANSI B1.3
Table 4A: Tightening Torque Range
Medium Carbon Steel SAE Hardware Grade 5 (Unless specified in below table)
Screw/Bolt Size Typical Application
Torque
(Inch-lbs)
Torque
(N-m)
#10 (Low Carbon Steel) Bearing Cap 15 - 25 1.7 – 2.8
1/4 in (Low Carbon Steel) Bearing Cap 35 - 60 4.0 – 6.8
1/4 in
All Parts, except Bearing Cap and
Fan Cover
70 – 96 7.9 – 10.8
1/4 in Grade 8 Fan Cover Mounting 100 - 145 11 – 16
5/16 in Bearing Cap 78 - 120 8.8 – 14
5/16 in All Parts, except Bearing Cap 170 - 250 19 – 28
3/8 (Low Carbon Steel) Conduit Box Cover 180 – 240 20 – 27
3/8 in
All Parts, except Conduit Box
Cover
250 – 370 28 – 42
1/2 in All Parts 610 – 920 70 – 100
3/4 in All Parts 2150 – 3200 240 – 360
Table 4B: Tightening Torque Range
Stainless Steel SAE Hardware Property Class 50
Screw/Bolt Size Typical Application
Torque
(Inch-lbs)
Torque
(N-m)
#10 Bearing Cap 15 – 25 1.7 – 2.8
1/4 in Bearing Cap 35 – 60 4.0 – 6.8
1/4 in All parts, except Bearing Cap 60 - 75 6.8 – 8.5
5/16 in Bearing Cap 78 – 120 8.8 – 14
5 /16 in All parts, except Bearing Cap 130 – 155 15 – 18
3/8 in All Parts 230 – 275 26 – 31
1/2 in All Parts 550 - 670 62 – 76
5/8 in All parts 1100 – 1340 120 – 150
3/4 in All Parts 2000 - 2360 230 - 270