Stub Acme or UN Threads
Stub Acme or UN Threads
(OP)
Hi folks,
Was just wondering if anyone could tell me the specific differences over Stub Acme Vs UN threads? As you know, you can design any thread size you like with these two types but why would you choose one over the other? I have heard in the past that stub acme threads have a tendency to back off easier - hence the reason that we usually use locking grub screws in conjunction with the SA threads.
Any help would be appreciated. My business sector is Oil/ Gas design
Thanks
Was just wondering if anyone could tell me the specific differences over Stub Acme Vs UN threads? As you know, you can design any thread size you like with these two types but why would you choose one over the other? I have heard in the past that stub acme threads have a tendency to back off easier - hence the reason that we usually use locking grub screws in conjunction with the SA threads.
Any help would be appreciated. My business sector is Oil/ Gas design
Thanks





RE: Stub Acme or UN Threads
RE: Stub Acme or UN Threads
RE: Stub Acme or UN Threads
RE: Stub Acme or UN Threads
I come up with my own thread sizes all the time. I gauge the pin using a three wire measure and then gage the box accordingly. This gets around the necessity of either designing and cutting gauges. Rarely do I have an interchangeability problem since I specify major, pitch and minor diameters on the print and measurement over wires for pins. You can get online calculators to do this for you, there are a number of good ones. But I prefer to write my own programs using the equations in the ASME specifications and developing make-up/break torques.
Regards,
Cockroach
RE: Stub Acme or UN Threads