pre plenum checklist
Legend
Joined: Jul 2007
Posts: 7,843
Likes: 13
From: DFW, Texas
A 5\16 x 18 zinc plated grade 5 bolt max torque to clamp force is 17 ft/lbs. Lubed is 13 ft/lbs.
Using the same standard zinc plated grade 5 bolt with anti-seize is 20% less than lubed, so the proper torque is actually 11.4 ft/lbs. I hardly doubt that torquing them the extra 7 inch/lbs is going to stress them to the point of failure, and they are reusable.
The real rub is finding the right bolt length. The stock TTY bolt is 2.25". If you go to the hardware store and try to buy 5/16 x 18 grade 5 bolts, you'll notice that the entire bolt is not threaded. In fact, those bolts will run out of thread before they reach the proper torque. A 2" bolt will grab, but there are only like 3 or 4 threads grabbing, and it never seemed to hold torque for me. You need to find the 2.25" bolts with full threading, it's a specialty bolt, and I found ordering from Richard was a better deal than buying them individually. Otherwise, I'd have had to order 100 bolts to make it effectively cheaper.
Using the same standard zinc plated grade 5 bolt with anti-seize is 20% less than lubed, so the proper torque is actually 11.4 ft/lbs. I hardly doubt that torquing them the extra 7 inch/lbs is going to stress them to the point of failure, and they are reusable.
The real rub is finding the right bolt length. The stock TTY bolt is 2.25". If you go to the hardware store and try to buy 5/16 x 18 grade 5 bolts, you'll notice that the entire bolt is not threaded. In fact, those bolts will run out of thread before they reach the proper torque. A 2" bolt will grab, but there are only like 3 or 4 threads grabbing, and it never seemed to hold torque for me. You need to find the 2.25" bolts with full threading, it's a specialty bolt, and I found ordering from Richard was a better deal than buying them individually. Otherwise, I'd have had to order 100 bolts to make it effectively cheaper.
