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## [TowerTalk] Stainless Bolts and Nuts on Tower

 To: [TowerTalk] Stainless Bolts and Nuts on Tower perring@texas.net (Bob Perring) Fri, 12 Nov 1999 07:53:09 -0600
 ```As but a few examples: For 316 SS bolts in the sizes of : 1/4", 5/16", 3/8". AA) Tightening to 65% of yield strength on the above sizes, using a 316 SS bolt, SA-193 Grade B8M, Class1, with bolts having a yield strength value of 30,000 lb/ sq. in., with a nickel based anti-seize compound being used on the fasteners: With a torque wrench: Use 2 ft-lb on 1/4-20UNC bolts and nuts Use 4 ft-lb on 5/16-18UNC bolts and nuts Use 8 ft-lb on 3/8-16UNC bolts and nuts If tightening dry, go to 5,9,17 ft-lb, respectively. Those are the values I use on offshore oil platforms. The low number always surprises people. We just about always tend to over tighten. BB) Without a torque wrench: Do This............... From page 113, Chapter X of "How to Keep your Volkswagen Alive" by John Muir. "A Manual of Step by Step Procedures for the Compleat Idiot" "OK, If you have or can borrow a torque wrench, no sweat, just torque the bolt to 9 ft. lbs. If you don't have a torque wrench, try this: It's kinda like bunting in baseball when you choke the bat. Choke the wrench by holding it and applying the turning force 6" (half a foot) from the center of the bolt. Now you can guess how much force is 18 pounds. Apply just that much at the 6" point and the torque will be right - at least as right as you guess about the 18 pounds. Set a bathroom scale up on its side and practice pushing 18 pounds." CC) Better yet, a 3/8" drive click style torque wrench (+ 4% accuracy) is about \$20.00 from Northern Tools in their latest catalogue. The flex handle style torque wrenches are even cheaper, and available at most automotive supply stores. 73, Bob, N5RP "zzzzzzz" __________ (E[__][__]|[_]\ | _ | _ |] =-(O)------(O)-= Home of: Casper, der freundliche Bus C. Robert Perring Consultant to Technology, ATD3 12715 Westmere Houston, Texas 77077 tele:(281) 493-5780 fax: (281) 493-5780 mailto:perring@texas.net http://perring.home.texas.net -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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