Comments on: Rolled vs Cut Thread Bolts

By: Greg Lindsay

Greg Lindsay — Tue, 23 Aug 2011 19:34:44 +0000

@akhil Unfortunately, this question is beyond our expertise as we only manufacture bolts with Imperial dimensions.

By: akhil

akhil — Tue, 09 Aug 2011 05:58:17 +0000

please let me know the basic diameter used for M16, in thread rolling machinem

By: Barry

Barry — Fri, 13 May 2011 13:36:16 +0000

My company bought US$200,000 worth of 16mm to 24mm rolled anchor bolts from a supplier in China.
Our engineer claims that the narrower shank (in the case of 20mm goes down to 18.3mm) will not comply with ASTM standards. Is he correct? as I understand that the narrower diameter will have no adverse effect mechanical properties. Note we use our anchor bolts for Pre Engineered Buildings.
Your expert advise will be appreciated. Rgds Barry

By: James Olson

James Olson — Tue, 26 Oct 2010 19:35:38 +0000

Great Info! Thank you, I use alot of B7 Studs in the water utility industry and this just enlightened me. Any info in the future is much appreciated. Thanks, Jim

By: Jonathan Waltner

Jonathan Waltner — Wed, 06 Jan 2010 16:20:41 +0000

@Freddy Keener – Cutting the threaded portion of the bolt won’t have any effect on the strength of the bolt. The only factor to worry about in a situation like that is that you leave the amount of thread needed to achieve minimum thread engagement.

By: Freddy Keener

Freddy Keener — Tue, 05 Jan 2010 01:24:22 +0000

Does a rolled thread fastener become weaker than its equivalent cut thread fastener when cut to a shorter length?

By: Ken Rollston

Ken Rollston — Wed, 11 Nov 2009 00:53:43 +0000

why don’t you roll thread anything over 150KSI??

By: Liz

Liz — Sat, 27 Jun 2009 12:56:55 +0000

Is there a visible difference between rolled and cut threads? I’ve heard that it may be possible to tell based on the curvature of the thread root, but I can’t find a source anywhere that says so either way.

By: Adam Oakley

Adam Oakley — Thu, 19 Mar 2009 18:11:36 +0000

ASTM allows full body A325 bolts to be roll threaded. However, reduced body roll thread, which is the process that Portland Bolt uses and is the topic of this article is not allowed. ASTM states that A325 and A490 structural bolts must meet the dimensional tolerances of ANSI 18.2.6 that would not allow the use of reduced body pitch diameter material. For A449 fasteners it references ANSI 18.2.1 for the dimensional tolerances. This specification allows a reduced body diameter to be used if the manufacturer and purchaser agree. Since the reduced body pitch diameter material is between the major and minor thread dimensions, it is usually allowed for most applications.

By: Jerry Hickey

Jerry Hickey — Thu, 19 Mar 2009 17:22:45 +0000

If you’re stating that A325 bolts should not be roll threaded. What is you opinion on roll threading non-head A449 bolts and A449 fully threaded studs?