Preventing galling with Stainless insert nuts

CaptainAhab

Super Anarchist
1,046
386
South Australia
I was assembling something yesterday using a 5/8” 316 bolt and nylon insert nut.

Damn if that thing didn’t gall right before the final tightening turn.

I was tightening with hand tools.
Is there any way to prevent galling when using insert nuts?
Any lubricant helps. You don't need tef gel or antisieze. Using the proper length bolt is a good idea. Don't by bolts that are 1" too long. Every rotation of the nut increases the chance of galling. Cheap bolts gall easier. The thread tolerance can be bad.
 

DDW

Super Anarchist
7,144
1,554
There is absolutely no science to back this up but more often than not if I have a issue it's with a standard fastener, we use almost exclusively metric hardware and the profile of threads is much less.
I've had it happen on both Imperial and Metric. But it does seem to come in batches, which suggests that the thread tightness tolerance may be key. Commercial fasteners in SS are ALL from China now, and their performance to ANSI or SAE spec is questionable. I didn't have many problems 20 years ago when I could get domestically produced or even European fasteners.
 

CaptainAhab

Super Anarchist
1,046
386
South Australia
I've had it happen on both Imperial and Metric. But it does seem to come in batches, which suggests that the thread tightness tolerance may be key. Commercial fasteners in SS are ALL from China now, and their performance to ANSI or SAE spec is questionable. I didn't have many problems 20 years ago when I could get domestically produced or even European fasteners.
I'm calling BS on this entire comment. First stop using caps. Second the majority of stainless fasteners were and are made in Taiwan. That has been the case for the last 20 odd years. The US setup a bunch of companies in Taiwan to make stainless and several other expensive manufactured goods in the 80's and 90's. If you are old enough to remember paying obscene amounts of cash for a few 1/4-20's made in the USA in the 80's.

Yes, China has started making some stainless. It is rubbish. Lot's of 302 that rusts while you stare at wondering if 302 is really stainless. Many inexpensive shackles are marked 316, but are not strong. I work in both the construction and marine industries. The majority of ss is still of reasonable quality made in Taiwan. If you read labels many good hand tools are made in Taiwan as well. They are like Asian heirloom.
 

DDW

Super Anarchist
7,144
1,554
I buy lots of stainless fasteners. I read the label of origin on the box. It is possible that the vendor is lying, and putting China on there when they are really Taiwan sourced, but that is highly doubtful. You are in OZ, maybe different than the USA. I can only speak for the latter.

For awhile, I would get fasteners from Taiwan, they weren't bad but not as consistent as the ones from USA or Germany. The ones I get now are visibly cockeyed. Heads not concentric with shafts, hex broach not in the middle of the head and/or the wrong size, etc. I can still get US fasteners custom make but they are expensive.
 

SloopJonB

Super Anarchist
74,829
16,087
Great Wet North
I've never experienced any of the problems you guys list.

I usually get my S/S from an industrial supplier and the quality is always good - dunno the origin though.
 

IStream

Super Anarchist
11,131
3,292
I'm a habitual user of stainless nyloc nuts and have never had one gall on me. Maybe I'm just lucky or maybe the fasteners I've been buying are at too sloppy. I seldom use tef-gel unless it's stainless into aluminum and I almost never grease my stainless-on-stainless connections.

The only thing I can think of is that I pretty much always tighten by hand rather than using a drill or impact driver.
 

RubbishDude

New member
23
24
Galling might be due to the producer having worn tooling and not cutting the thread right Or some other error in manufacture. Speaking of which when using Sta-lok swageless fittings, if it is older fitting, put a bit of oil on the threads and cable. I had two gall up on my completely. Had to cut them off.
 

Jules

Super Anarchist
10,393
4,851
Distopia SE, USA
I was assembling something yesterday using a 5/8” 316 bolt and nylon insert nut.

Damn if that thing didn’t gall right before the final tightening turn.

I was tightening with hand tools.
Is there any way to prevent galling when using insert nuts?
Don't know how it would work in your application but I coat threads with beeswax.
 



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