thread class - 3A screw in 2B hole?
thread class - 3A screw in 2B hole?
(OP)
hello,
i'm wondering if anybody can share some thoughts on mixing thread classes. specifically, what would be the potential problems versus a 'proper' class 2 or class 3 thread. thanks!
i'm wondering if anybody can share some thoughts on mixing thread classes. specifically, what would be the potential problems versus a 'proper' class 2 or class 3 thread. thanks!





RE: thread class - 3A screw in 2B hole?
Class 2 in class 2 always has a certain amount of clearance.
A class 3 screw in a class 2 hole will have a fit somewhere between these 2. So, simplistically, it will be 'tighter' than a 2 in a 2 but looser than a 3 in a 3.
It will be more tolerant of 'contamination' in between threads than a 3-3, but not as tolerant as a 2-2.
Take a look at ASME B1.1 to better understand unified thread tolerances.
What is your application?
KENAT, probably the least qualified checker you'll ever meet...
RE: thread class - 3A screw in 2B hole?
Chris
"In this house, we obey the laws of thermodynamics." Homer Simpson