RCU Forums - View Single Post - ASP 21 GOING CRAZY trying to find the propnut size and thread count??? HELP

07-11-2009 | 01:27 AM

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DarZeelon

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From: Rosh-HaAyin, ISRAEL

RE: ASP 21 GOING CRAZY trying to find the propnut size and thread count??? HELP

Quote:

ORIGINAL: Broken Wings

Allow me to correct you. The American Unified Standard Thread Series classifies UNC Unified National Course as the 1/4-20 size NOT UNEC
UNF is Unified National Fine 1/4-28 and UNEF Unified National Extra fine as 1/4-32

There is NO UNEC Unified National Extra Course designation for American Threads...

BW,

You are right about the nomenclature.

I could not find the UNEC thread title...

But between the UNF of 28 tpi and the UNC of 20 tpi, there is another tpi of 24... 1/4"x24 bolts, nuts and appropriate taps and dies do exist.

Here are [link=http://www.google.com/products?q=thread+tap+1/4%22+24&sourceid=navclient-ff&rlz=1B3RNFA_enIL241IL243&um=1&ie=UTF-8&ei=mC9YSoCXFI6InQPdiOXdCQ&sa=X&oi=product_result _group&ct=title&resnum=4]some taps[/link], for example. This size is quite common in Harley-Davidson motorcycles.

Common it is, even in hardware stores, but there seems not to be a title for it in charts... It is commonly called NS (National Standard)

Because of the huge difference between UNC and UNF, I was under the impression that the 24 tpi is worthy of the title UNC and that the 20 tpi is the UNEC...

I must have been wrong...

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