RE: Bolt Thread Engagement

B31.3 (asme not astm) says
"... if the lack of full engagement is not more than one thread." Note the word "full" and then get a sample of a stud bolt and nut. Take a closer look at the first few pitches of the thread/nut and what do you notice. Right. Its only partially formed because of the chamfer, etc.

It has to "stick-out" (in the words of Christopher) a min. of one thread just to meet the lack of one full thread engagement. But why look at the last sentence when its just easy to meet the first sentence - bolt should extend completely through their nuts. By so doing, you at least avoid thread stripping(says Bill Eccles of boltscience.com).

-----Original Message-----
From: m.apte@ticb.com [mailto:m.apte@ticb.com] Sent: 19 March, 2002 5:32 PM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Bolt Thread Engagement

The ASTM B 31.3 states that the bolting is acceptable even if the amount of dis engagement is upto 1 thread.
i.e. the bolt can be inside the nut by not more than one thread. it means even if it does not come out of nut it is acceptable ( though not prefered.)

Have a nice day.
-Mandar.

> Does anyone know of a ASTM on ANSI standard that
> discusses the number of<BR>
> threads that must be engaged in a bolt
Received on Thu Mar 21 02:03:00 2002