Torque specification for setting thread rings vs. "Finger Force" and "Snug"

F

frantisek

#11
I am currently having this kind of issue when the customer rejected our studs with argument that they are not gauging. I was going through many reference books of forums like this but didn't succeeded.

At last ai found a possible answer:confused::
ISO 6157-3:1988 (Fasteners-Surface discontinuities) standard says about thread damages:

::Cause I:
Damages, for example dents, scrapes, nicks and gouges, are produced by externai action during manufacture and handling of bolts and screws, for example during loading.

::Appearance:
No precise geometrical shape, location or direction, identifiable as external action.

::Limits:
Damages as described above shall not Cause rejection unless it tan be shown that they impair function or usability.

Dents, scrapes, nicks and gouges on the first three threads shall be such that they allow the screwing on of a go-ring gauge with torque values of 0,001 d3 max., in newton metres.

A specific agreement on packaging, for example, may be necessary in Order to avoid darnage during transport.
 
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