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Metric Fastener Specifications

Metric Fastener Specifications

Metric Fastener Specifications

(OP)
Hopefully this is not an off the wall question, I come from a background of specifying hardware by using a MIL-Spec and dash number to describe exactly the part I want. For example, in the old days I would call out MS51957-3 and I knew I was going to get a "Screw, Machine, Pan Head, 2-56 x .250L" part. I could reference the MS number on a BOM and I knew that the purchasing department could source this part from anywhere.

Currently, my career takes me down the path of metric hardware. I am trying to get my purchasing department to buy some ISO specifications so I can familiarize myself with them but wanted to know if someone could tell me if Metric specifications are somewhat similar to a Mil-Spec. Specifically, do metric specifications detail parts like the example above? Are there dash numbers detailing out thread sizes, length, etc..? Or are they vague?
I appreciate any input you may have.
 

RE: Metric Fastener Specifications

The following is an example designation from ISO 14583:

A hexalobular socket pan head screw with thread M5, nominal length l = 20 mm and property class 4.8 is designated as follows:

Hexalobular socket pan head screw ISO 14583 - M5 x 20 - 4.8

 

RE: Metric Fastener Specifications

zora65, from memory I don't think they specify them quite as explicitly as the MS standards.  However I worked British Standards and some of the older ones may not have been fully aligned with the actual ISOs.

I have the same frustration here, we don't define our hardware properly, certainly don't call up MS etc.

KENAT,

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