Hello, new guy, question about surface discontinuities in fasteners
Hello, new guy, question about surface discontinuities in fasteners
(OP)
Hello,
I'm a QC Material Specialist for large underwater communications systems manufacturer. I've run into an issue with regard to some surface features in small stainless steel screws and as to whether they are conforming to the ASTM specs we use. Particularly I'd like some direction on opinions on what the differences are between bursts, seams, quench cracks or forge cracks. I am using primarily ASTM F788 to inspect to. I have photos I can upload if that is allowed and would help. I believe that what we are seeing in the heads of these very small screws (.086-56 UNC 2A)is likely conforming but I'm getting push back.
Any help is appreciated.
Scott
I'm a QC Material Specialist for large underwater communications systems manufacturer. I've run into an issue with regard to some surface features in small stainless steel screws and as to whether they are conforming to the ASTM specs we use. Particularly I'd like some direction on opinions on what the differences are between bursts, seams, quench cracks or forge cracks. I am using primarily ASTM F788 to inspect to. I have photos I can upload if that is allowed and would help. I believe that what we are seeing in the heads of these very small screws (.086-56 UNC 2A)is likely conforming but I'm getting push back.
Any help is appreciated.
Scott





RE: Hello, new guy, question about surface discontinuities in fasteners
RE: Hello, new guy, question about surface discontinuities in fasteners
RE: Hello, new guy, question about surface discontinuities in fasteners
http://www.indfast.org/info/free-technical-info.as...
RE: Hello, new guy, question about surface discontinuities in fasteners
RE: Hello, new guy, question about surface discontinuities in fasteners
It seems to hinge on the statement in F879 that says, "10.2.1 The surface discontinuities for these products shall conform to Specification F788 and the additional limitations specified herein."
F788 makes it clear that it's specifications that are similar to F879 with regard to head discontinuities only apply to screws greater than .125". So does this mean that any screw smaller than .125" is exempt from F879's call outs or to do they apply. At this point we are erring on the side of caution and just discarding anything with a head discontinuity that runs from the socket to the edge just to be sure. But for future reference I'd like to know what the experts think.
RE: Hello, new guy, question about surface discontinuities in fasteners
RE: Hello, new guy, question about surface discontinuities in fasteners