bore diameter in a 1/4-36 UNS-2A thread
bore diameter in a 1/4-36 UNS-2A thread
(OP)
I need to bore a hole in a male 1/4-36 threaded feature. The thread is about 0.6 inches long. The minor diameter on a 1/4-36 thread is about 0.212 inches. I need the largest possible bore. The material is 6061-T6.
Question: what is the largest bore I can get away with given the 212 mil minor diameter and without compromising the structural integrity of the thread?
Any help is always appreciated.
Question: what is the largest bore I can get away with given the 212 mil minor diameter and without compromising the structural integrity of the thread?
Any help is always appreciated.





RE: bore diameter in a 1/4-36 UNS-2A thread
RE: bore diameter in a 1/4-36 UNS-2A thread
RE: bore diameter in a 1/4-36 UNS-2A thread
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RE: bore diameter in a 1/4-36 UNS-2A thread
This is not a dimensioning and tolerancing question.
Try forum725: Welding, Bonding & Fastener engineering or forum404: Mechanical engineering other topics.
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JHG
RE: bore diameter in a 1/4-36 UNS-2A thread
The largest hole that could be bored while keeping the stress levels acceptable for your application is unknown as you have not provided any information that would allow anyone to even make a guess.
RE: bore diameter in a 1/4-36 UNS-2A thread
I will try 725 or 404.
Thanks for the time.
RE: bore diameter in a 1/4-36 UNS-2A thread
My very quick and dirty estimate is that a 1/4-32UN thread out of aluminium 6061-T6 can take around 60lb.in of torque. This is affected drastically by friction, a problem with aluminium, and by the safety factor you must use on this relatively brittle material.
If your torque is 8lb.in, you can reduce the strength of your screw by quite a lot. Still, this is a structural calculation. On this forum, you ask us how to specify the location of the drilled hole.
Are you screwing this into another aluminium piece? Aluminium galls, especially if it is not anodized.
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JHG
RE: bore diameter in a 1/4-36 UNS-2A thread
RE: bore diameter in a 1/4-36 UNS-2A thread
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: bore diameter in a 1/4-36 UNS-2A thread
Take a look at http://www.efunda.com/designstandards/screws/unifi... for many other thread pitches.
RE: bore diameter in a 1/4-36 UNS-2A thread
In the world of microwave connectors, 1/4-36 is one of the more common threads shared by 3.5mm, 2.92mm and SMA connectors. The latter may be the most ubiquitous microwave connector in the world. They are staples in the cell, web and radar infrastructure, and in virtually all forms of modern communication.
RE: bore diameter in a 1/4-36 UNS-2A thread
Jim