Fastener Torque Specifications

Fastener Torque Recommendations

Listed below are the recommended torque values for most ARP fasteners. Recommended torque value is 75% of the fastener's yield strength.
 
THE TORQUE VALUES REPRESENTED ON THIS PAGE ARE INTENDED TO BE FOR GENERAL INFORMATION ONLY, AND NOT FOR SPECIFIC INSTALLATIONS!
 
In special instances where supplied instructions deviate from the torque values listed here, always go with the enclosed instructions. Stud torque values are based upon coarse thread yield strength and torque being applied to the fine thread. (Example: a 7/16"-14 in the block and a 7/16"-20 threaded nut).
 
Recommended Torque to Achieve Optimum Preload (clamping force) Using ARP Moly Assembly Lubricant or 30-wt oil
Torque = (ft/lbs.),  Preload = (lbs.) 
 
 NOTE: For those using Newton/meters as a torquing reference, you must multipy the appropriate ft/lbs. factor by 1.356
  

Thread Size and Type

Fastener Tensile Strength (PSI)

170,000 (1171N/mm²)

190,000 (1309 N/mm²)

220,000 (1515N/mm²)

Torque w/30wt oil

Torque w/ARP Moly

Preload

Torque w/30wt oil

Torque w/ARP Moly

Preload

Torque w/30wt oil

Torque w/ARP Moly

Preload

1/4" Stud 12 10 3,804 14 11 4,280 15 12 4,755
1/4-20 13 10 3,804 14 11 4,280 16 13 4,755
1/4-28 14 11 4,344 16 13 4,887 18 14 5,430
5/16" Stud 25 20 6,264 28 22 7,047 32 25 7,830
5/16-18 26 21 6,264 29 23 7,047 32 26 7,830
5/16-24 28 22 6,948 32 25 7,817 35 28 8,685
3/8" Stud 45 35 9,276 50 39 10,436 56 44 11,595
3/8-16 46 36 9,276 51 41 10,436 57 45 11,595
3/8-24 50 39 10,512 57 44 11,826 63 49 13,140
7/16" Stud 71 56 12,720 80 63 14,310 89 70 15,900
7/16-14 73 58 12,720 82 65 14,310 91 72 15,900
7/16-20 80 62 14,220 90 70 15,998 100 78 17,775
1/2" Stud 108 84 16,992 122 95 19,116 135 105 21,240
1/2-13 111 88 16,992 125 99 19,116 138 110 21,240
1/2-20 122 95 19,164 137 107 21,560 152 119 23,995
9/16" Stud 156 122 21,792 175 137 24,516 195 152 27,240
9/16-12 159 126 21,792 179 142 24,516 199 158 27,240
9/16-18 174 136 24,312 196 153 27,351 217 170 30,390
5/8" Stud 214 167 27,072 241 187 30,456 268 208 38,840
5/8-11 220 174 27,072 247 196 30,456 275 217 38,840
5/8-18 243 189 30,660 273 212 34,493 303 236 38,325
10mm Stud 54 42 10,680 61 48 12,015 68 53 13,350
11mm Stud 80 63 14,220 90 71 15,998 100 79 17,775
12mm Stud 97 77 15,540 109 86 17,483 122 96 19,425
 
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