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johnneilson · 03-22-2023, 07:19 PM

Interesting subject, fasteners.

I was looking thru the 1919 Machinery Handbook

Not sure when the S.A.E specs came into existence except to mention it replaced the A.L.A.M specs of April 1906 (association of licensed automobile manufacturers)

So, Class fits did not exist in the SAE specifications.
Specs given as the body of the fastener to be .001 less than the nominal diameter, nor smaller than .002 smaller than nominal dia. That is not the case today at all.
The nut to be .002 - .003 larger than nominal dia (major dia of thread)

materials for screws and plain nuts steel min 100,000 psi tensile with elastic limit of 60,000 psi
castle nuts to be case hardened.

John

03-22-2023, 07:19 PM	#32
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,064	Re: Rear axle nut Interesting subject, fasteners. I was looking thru the 1919 Machinery Handbook Not sure when the S.A.E specs came into existence except to mention it replaced the A.L.A.M specs of April 1906 (association of licensed automobile manufacturers) So, Class fits did not exist in the SAE specifications. Specs given as the body of the fastener to be .001 less than the nominal diameter, nor smaller than .002 smaller than nominal dia. That is not the case today at all. The nut to be .002 - .003 larger than nominal dia (major dia of thread) materials for screws and plain nuts steel min 100,000 psi tensile with elastic limit of 60,000 psi castle nuts to be case hardened. John __________________ As Carroll Smith wrote; All Failures are Human in Origin.