Dimension a Screw 3

[janandk]

I am trying to call out a screw spec. on a drawing. It is a M4 X 0.7 screw. Is there any other spec. to a screw other than the "M4 X 0.7" callout. What happened was the supplier sent us the screws as per the M4 X 0.7. But it failed our testing gages because they were a different "D" spec. I checked on various drafting standards. I could not find anymore information about a "D" spec. for screws. I would appreciate if anybody can give me soem information about this. Thank you.

 

[israelkk]

Yes,

http://www.tech.volvo.se/standard/docs/508115.pdf

You will find there the ISO metric screw threads Limits of sizes.

 

[ajack1]

I cannot speak for the rest of the world but in Europe in the automotive trade it is normal to specify a DIN or ISO number to cover things like material, tolerance and finish/ coating.

Even if none of these matter, length is normal.

These might help.

http://www.rapoole.com/fasteners/table.asp

http://mdmetric.com/fastindx/inxtst.htm

 

[Heckler]

You might also want to consider using a NAS, MS, or AN spec to control your mechanical hardware. Although, the per piece price will increase some industries mandate that type of control.

Best Regards,

Heckler
Sr. Mechanical Engineer
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