MCCOY KT5500 - Page 67

80-0420-23 POWER TONG
Manual № TM12012
Section 5
Page 5.9
©2008-2017 McCoy Global
Maintenance
5.7 ASSEMBLY PRACTICES (CONTINUED):
TIGHTENING TORQUE GUIDE (DRY)
SAE GRADE 8 - FINE THREAD
SIZE CLAMP
LOAD
PLAIN PLATED
¼ - 28 (.250) 3,263 14 ft. lbs. 10 ft. lbs.
5
/
16
- 24 (.3125) 5,113 27 ft. lbs. 20 ft. lbs.
⅜ - 24 (.375) 7,875 49 ft. lbs. 37 ft. lbs.
7
/
16
- 20 (.4375) 10,650 78 ft. lbs. 58 ft. lbs.
½ - 20 (.500) 14,400 120 ft. lbs. 90 ft. lbs.
9
/
16
- 18 (.5625) 18,300 172 ft. lbs. 129 ft. lbs.
⅝ - 18 (.625) 23,025 240 ft. lbs. 180 ft. lbs.
¾ - 16 (.750) 33,600 420 ft. lbs. 315 ft. lbs.
⅞ - 14 (.875) 45,825 668 ft. lbs. 501 ft. lbs.
1 - 12 (1.000) 59,700 995 ft. lbs. 746 ft. lbs.
1 - 14 (1.000) 61,125 1019 ft. lbs. 764 ft. lbs.
1-⅛ - 12 (1.125) 77,025 1444 ft. lbs. 1083 ft. lbs.
1-¼ - 12 (1.125) 96,600 2012 ft. lbs. 1509 ft. lbs.
1-⅜ - 12 (1.375) 118,350 2712 ft. lbs. 2034 ft. lbs.
1-½ - 12 (1.500) 142,275 3557 ft. lbs. 2668 ft. lbs.
SAE GRADE 8 - COARSE THREAD
SIZE CLAMP
LOAD
PLAIN PLATED
¼ - 20 (.250) 2,850 12 ft. lbs. 9 ft. lbs.
5
/
16
- 18 (.3125) 4,725 25 ft. lbs. 18 ft. lbs.
⅜ - 16 (.375) 6,975 44 ft. lbs. 33 ft. lbs.
7
/
16
- 14 (.4375) 9,600 70 ft. lbs. 52 ft. lbs.
½ - 13 (.500) 12,750 106 ft. lbs. 80 ft. lbs.
9
/
16
- 12 (.5625) 16,350 153 ft. lbs. 115 ft. lbs.
⅝
- 11 (.625) 20,325 212 ft. lbs. 159 ft. lbs.
¾ - 10 (.750) 30,075 376 ft. lbs. 282 ft. lbs.
⅞ - 9 (.875) 41,550 606 ft. lbs. 454 ft. lbs.
1 - 8 (1.000) 54,525 909 ft. lbs. 682 ft. lbs.
1-⅛ - 7 (1.125) 68,700 1288 ft. lbs. 966 ft. lbs.
1-¼ - 7 (1.125) 87,225 1817 ft. lbs. 1363 ft. lbs.
1-⅜ - 6 (1.375) 103,950 2382 ft. lbs. 1787 ft. lbs.
1-½ - 6 (1.500) 126,450 3161 ft. lbs. 2371 ft. lbs.
NOTICE
IMPORTANT ASSEMBLY INFORMATION
DO NOT TORQUE NYLOCK NUTS. NYLOCK NUTS ARE NOT USED FOR CLAMPING PURPOSES AND
SHOULD ONLY BE TIGHTENED UNTIL METAL-TO-METAL CONTACT IS MADE AND VERTICAL MOTION
IS ELIMINATED. OVER-TIGHTENING WILL RESULT IN PREMATURE BUSHING FAILURE AND WILL
INHIBIT ROTATION, AND MAY IMPART EXCESS STRESS ON ROTATING COMPONENTS.
NYLOCK NUTS ARE A ONE-TIME USE ITEM AND MUST BE DISCARDED AND REPLACED AFTER USE.