MSI Hybrid Quintuplex, Technical Manual, Page: 87 / 88

Appendix C FASTENER TORQUE DATA
GENERAL TORQUE TABLE
Cap screws, nuts & bolts Alloy Steel Studs & Nuts
SAE GRADE 5 SAE GRADE 7
Thread Diameter
& Thread Pitch
Dry Threads
Torque (ft*lbs)
Lubricated Threads
Torque (ft*lbs)
Dry Threads
Torque (ft*lbs)
Lubricated Threads
Torque (ft*lbs)
1/4-20 UNC 6.7 5.1
5/16-18 UNC 13.9 10.4
3/8-16 UNC 24.7 16.5
7/16-14 UNC 39.4 29.6
1/2-13 UNC 60.3 45.2
5/8-11 UNC 110 80
3/4-10 UNC 212 159
7/8-9 UNC 315 236 425 318
1-8 UNC 472 354 635 477
1-1/8- 7 UNC 633 475 900 675
1-1/4- 7 UNC 900 675 1270 955
1-3/8-8 UN 1660 1245
1-5/8-8 UN 2300
1-3/4-8 UN 2400
**Specific Installation Torques**
Connecting Rod Cap Nuts: Install 5/8”-11 castellated nuts using Loctite® Threadlocker Blue and torque to
150 ft-lbs of torque.
Connecting Rod Pin Screws : Install 3/8”-16 screws using Loctite® Threadlocker Blue and torque to 40 ft-lbs
of torque.
Crosshead Slide Screws : Install 5/8”-11 screws using Loctite® Threadlocker Blue and torque to 50 ft-lbs of
torque.
Fluid End Plungers : Install plungers using anti-seize compound and torque to 375 ft-lbs of torque.
Power End Plunger Screws : Install 1/2”-13 screws using Loctite® Threadlocker Blue and torque to 75 ft-lbs
of torque.
Revision K 03/12/2019 MSI - A Division of Dixie Iron Works, Ltd. All rights reserved. Page 84