In order to be able to order industrial fasteners (to be specific) without any ambiguity, we must first understand a fastener and all its attributes. Lets start defining a fastener as a piece of machinery used to connect two of more components given its size, shape and structure, with a help of interlocking thread mechanism.
Fastening component includes a pair of externally threaded part usually called a bolt or machine screw and a supplementary female threaded part; called a nut with interlocking thread profile.
Fasteners are handy and comes with variety of shapes, size and thread profile coupled with material of construction and surface coating depending upon the application requirement.
Type, Size and Thread profile; these three attributes clears the basics of any industrial fastener. However there are some other critical attributes such as material of construction, dimensional reference, and coatings. To complete one may also specify types of tests needs to be done on the product as their application environment may demand.
We shall decipher a fastener description. For example,
Hex Bolt, M12-1.75P x 75MM, DIN 931, ASTM A193 Grade B7, PTFE Coated.
Let us segregate each attribute.
Hex Bolts - Type of Bolt Fastener
M12 - Defines the size of the bolt body.
1.75P - Defines the thread profile of the externally threaded bolt.
75MM - It is the length of the bolt required by the application.
Further DIN 931 refers to the construction parameters of the said bolt to which it must comply with tolerance state if any.
ASTM A193 is an industry standard specification with B7 as one of its grade (alloy steel origin) which must fulfilled.
PTFE stands for Carbon Polymer termed as PolyTetraFluoroEthylene. The bolt must be duly coated with reference to suitable industry standards.
Usually fasteners are produced and tested under the a material standard (here, ASTM A193), which already states chemical and mechanical requirement. And so the fasteners are tested for compliance and supply with a inspection certificate.
If the customer need addition test, the same can be requested followed inline with the basic fastener details.
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