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Old 12-13-2018, 11:04 AM   #1
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Pin box bolt torque

I want to adjust my pin box down so I can lower the ball on my Andersen Ultimate. The bolts are most likely 5/8", as the bolt heads are 15/16". Does anyone know for sure what the proper torque is for them? I've searched the net and the forum, and haven't found a conclusive answer. (I have 7" of clearance between the bed rails and the 5er so that's not a concern.) Thanks!
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Old 12-13-2018, 11:16 AM   #2
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This is what was on Etrailer, I will say this I tried 275lbs on 3/4 #5 bolts and lock washers, it broke my lock washers. I also had an RV tech tell me 120lbs, they use air impact wrenches set to 120 ft lbs. I went with 225 ft lbs using Grade 5 3/4 bolts, I check mine twice a year.

1/2 inch Bolts GR5 90 ft-lbs
5/8 inch Bolts GR5 150 ft-lbs
3/4 inch Bolts GR5 275 ft-lbs

Here is the link - https://www.etrailer.com/question-138310.html

Here is another link - http://americanboltcorp.com/tech/techtorque.pdf
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Old 12-13-2018, 11:23 AM   #3
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Do you know which pin box you have.

Here's what etrailer says about the 1621 pin box torque specs.

Quote:
Pin box bolt torque is based on the size of the bolts.
1/2 inch Bolts GR5 90 ft-lbs
5/8 inch Bolts GR5 150 ft-lbs
3/4 inch Bolts GR5 275 ft-lbs
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Old 12-13-2018, 12:49 PM   #4
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Thanks. That was the number I came up with based on size. Just wasn't sure what Lippert wanted.
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Old 12-13-2018, 01:11 PM   #5
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That's a big torque wrench to get to 275ft/lbs.
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Old 12-13-2018, 01:52 PM   #6
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Here are recommended torque specs for bolts from a manufacturer.


Size Recommended Torque
Grade 2 Grade 5 Grade 8 18-8 S/S Bronze Brass
Coarse Fine Coarse Fine Coarse Fine Coarse Fine Coarse Fine Coarse Fine
#4* - - - - - - 5.2 - 4.8 - 4.3 -
#6* - - - - - - 9.6 - 8.9 - 7.9 -
#8* - - - - - - 19.8 - 18.4 - 16.2 -
#10* - - - - - - 22.8 31.7 21.2 29.3 18.6 25.9
1/4" 4 4.7 6.3 7.3 9 10 6.3 7.8 5.7 7.3 5.1 6.4
5/16" 8 9 13 14 18 20 11 11.8 10.3 10.9 8.9 9.7
3/8" 15 17 23 26 33 37 20 22 18 20 16 18
7/16" 24 27 37 41 52 58 31 33 29 31 26 27
1/2" 37 41 57 64 80 90 43 45 40 42 35 37
9/16" 53 59 82 91 115 129 57 63 53 58 47 51
5/8" 73 83 112 128 159 180 93 104 86 96 76 85
3/4" 125 138 200 223 282 315 128 124 104 102 118 115
7/8" 129 144 322 355 454 501 194 193 178 178 159 158
1"† 188 210 483 541 682 764 287 289 265 240 235 212
* Sizes from #4 to #10 are in lb-in.
Sizes from 1/4" up are in lb-ft.
† Fine thread figures are for 1"-14.
Grade 2, 5, and 8 values are for slightly lubricated bolts.


EDIT: That formatting made it a little hard to read.
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Old 12-13-2018, 03:13 PM   #7
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Quote:
Originally Posted by Gsykora View Post
That's a big torque wrench to get to 275ft/lbs.
I've got one. Seriously. 1" drive. Sombitch is three and a half feet long. Goes up to 500 ft lbs. Ya need two men, a boy, and a donkey to carry it.
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