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Anchor Bolts. Is there a difference between cut and rolled thread?

  
  

Functionally, there is no difference between a cut thread and a rolled thread. The difference enters in the manufacture of the bolt.  Using 1” anchor bolts as an example the processes are:

Cut thread is created by a process that cuts away the steel from the round bar to form the threads. To cut thread, the process begins with a full 1” diameter round bar. The threads are cut into the round bar resulting in an anchor bolt with 1” diameter threads and a body of 1” diameter. 

Rolled thread is created by a process that extrudes steel from the surface of the round bar to form the threads. To roll thread, the process begins with .912” round bar. The round bar is rolled through a set of dies that displace the steel to form the threads. The result is a bolt with 1” diameter thread and a .912” body. 

Cut thread meets all ASTM specifications. Rolled thread meets ASTM specifications with the exception of A325 and A490. However, one thing to remember is that Architects and Engineers often specify cut thread for anchor bolts. Cut thread can always be substituted for rolled thread but the opposite may not always be true.

Rolled v Cut copy

Comments

Is there a maximum diameter you can bend?
Posted @ Wednesday, April 18, 2012 8:31 AM by Emily
Thanks for this. Our customers ask this question all the time!
Posted @ Wednesday, December 19, 2012 11:18 AM by Wire Forming
The rolled threads have lower stress concentration factor and will behave stronger in fatigue cases.
Posted @ Thursday, November 14, 2013 8:22 AM by P.Deravi
We have seen the information regarding the benefits of rolled threading. Maintaining the consistency of the grain would apparently add strength. As well, in the re-working process the steel typically hardens which would also add strength, but may also cause the steel to become more brittle. While it makes sense, we have not seen any test results proving the benefits of roll threading.
Posted @ Thursday, November 14, 2013 4:58 PM by Barbara Obeid
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