A question of hardness - Page 2 - Fiberglass RV

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Old 02-08-2013, 03:00 PM   #15
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Grade 5 has three lines on the head.

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Old 02-08-2013, 04:34 PM   #16
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Originally Posted by Steve Hilby View Post
Don't use stainless nuts with stainless bolts. I was amazed at how fast and firm they can seize. I spun a stainless nut by hand onto a stainless bolt once to check something, and the darn thing froze solid. I couldn't get it loose, even with a wrench, and eventually ended up throwing the bolt/nut away. It was quite surprising.
Interesting, galling is usually associated with heat and tightening too tight. Perhaps they were different alloys? I have never had an issue and tend to use stainless a lot for low load applications. Raz

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Old 02-08-2013, 04:46 PM   #17
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I have read that how fast you spin the nut affects galling. Slower is better. What I was reading referred to the use of power tools, so may not apply here. A grain of sand can also cause galling.
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Old 02-08-2013, 05:26 PM   #18
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Slower speed, boelube, or anti-seize. If they don't want to go together by hand, don't force it. If the threads are a bit off and you try to make it work, they will gall easily. I use a lot of stainless, and have very few problems. I've put thousands of them in (or out) in a single day at work.
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Old 02-09-2013, 09:51 AM   #19
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If you want stainless bolts to stay stainless you MUST use SS nuts. SS Bolts will quickly rust when mated with non-stainless nuts, washers etc. I can't say that I have ever had ss fasteners sieze though.... I don't think that's a common problem, but there is always anti-sieze compound to use if there is any concern.

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