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Bolt identification

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03 Mar 2021 14:01 #42477 by Curt Schulze
Replied by Curt Schulze on topic Bolt identification
Do not forget "30" . They are very prevalent on 34-36 Auburns. Plain heads
(no marks) were also used. The old bolts have a 'high hex' the newer style , came after WWII. This is also true for steel and brass fittings.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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05 Mar 2021 18:02 #42511 by johnmereness
Replied by johnmereness on topic Bolt identification
Yes, lots of 30 bolts.

I usually find N's on the frame and attachment for the fenders. I really have no rule of thumb though other than I find N's where there does not need to be a torque.

JMM

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  • DONALD.ELMER
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06 Mar 2021 03:40 #42522 by DONALD.ELMER
Replied by DONALD.ELMER on topic Bolt identification
Interesting... are there specific bolts when torque is required?

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06 Mar 2021 14:31 #42526 by Curt Schulze
Replied by Curt Schulze on topic Bolt identification
No, torque wasn't used for automotive applications until WWII

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
The following user(s) said Thank You: Jonathan Richards

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11 Mar 2021 23:45 #42598 by johnmereness
Replied by johnmereness on topic Bolt identification
I would agree to disagree with Curt on that - Curt is very correct in that it is not that they used grade 3, 5, and 8 like today - it was that they had certain diameters of bolt and certain thickness of head to allow for the equivalent. Thus, an N bolt that you see more often on a frame is different from say a 30 bolt - even though there is not formal grade 3, 5, 8, or ... designation.

JMM

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12 Mar 2021 15:42 #42609 by Curt Schulze
Replied by Curt Schulze on topic Bolt identification
John, I would like to see metallurgy tests on 'W' , 'N' , '30' and Plain head high hex bolts. The only place that I know the factory was consistent was the head bolts .

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
The following user(s) said Thank You: Jonathan Richards

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