Machine Screw with Yield Stress Rating
Machine Screw with Yield Stress Rating
(OP)
Does anyone know a good supplier where I can purchase machine screws with a certificate giving the yield stress rating?
We are working on an ATEX listing and the agency is requesting the yield stress rating for a screw we are using. The cert we recieved from our vendor only gives the tensile rating. The agency will not accept this. Our vendor is a distributor, who recieves the screws from another distributor, and another, and so on. They couldn't get any yield information for us.
We tried to have the screws tested, but they are too small.(#10 x 1" Phillips Pan Head Screw, Self-Tapping, Type A)
We have been unable to find any other vendors that can supply us with screws including a cert with the yield rating. Any ideas?





RE: Machine Screw with Yield Stress Rating
RE: Machine Screw with Yield Stress Rating
The agency won't accept anything other than a cert from the manufacturer with the yield rating, or a test report from a certified lab.
RE: Machine Screw with Yield Stress Rating
We supply ATEX certified equipment where fasteners might have some significance in the evaluation and we have never been requested to supply this level of information.
RE: Machine Screw with Yield Stress Rating
RE: Machine Screw with Yield Stress Rating
RE: Machine Screw with Yield Stress Rating
RE: Machine Screw with Yield Stress Rating
As TVP says, small size screws are usually tested in torsion rather than in tension. Even though the final user is asking for the yield strength of the screws, he is not going to be able to use these values in any kind of meaningful analysis of the screw's performance.