DIN/ISO/ANSI/JIS What are they?

DIN - Deutsches Institut für Normung (German Institute for Standards)
The vast majority of metric fasteners are presently manufactured to this standard which was created long before ISO standards. There are DIN standards for just about everything. DIN standards are currently being revised to more closely match ISO standards. For ordering fasteners all you need is:
  1. The DIN( which defines the style of the fastener)
  2. The material desired (i.e. 8.8 Steel, 316 Stainless, Hastelloy C276)
  3. The coating or plating (if any)
ISO - International Standard Organization
Founded in 1946 this organization publishes standards which individual countries have to vote on and are asked to apply. Currently ISO is comprised of more than 90 member countries. ISO’s standards for metric fasteners are rapidly gaining more recognition and in the years to come will probably become the world standard.
ANSI - American National Standard Institute
A US organization that has developed standards which are essentially in agreement with ISO standards.
JIS - Japanese Industrial Standard
Although mainly based on DIN, some standards have been modified based on the needs of the Japanese market. Fasteners used in most electronic equipment manufactured in Japan fall under the JIS standard.

All of the standards listed above detail an items’ dimensional specifications and material content. These standards are accepted worldwide and ensure you that any items that are ordered according to a particular standard will meet the specifications in compliance to the listed standards regardless of the manufacturer. Although there are many different standards for metric they are all manufactured to the same thread. The DIN spec may call for a certain head dimension and ANSI spec another but a 10x1.25 ANSI hex bolt will always thread into a DIN 10x1.25 hex nut and vice versa.

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What is thread pitch?

Metric screw threads are identified by the capital letter M, followed by the nominal diameter which can be further defined by the thread pitch. If no thread pitch is specified the thread is assumed to be coarse thread.

Metric Coarse Thread Metric Fine Thread
M10 M10x1.25
M12 M12x1.25

The pitch is the distance from one crest of the thread to the crest of the next thread.

Please see our Technical Information section for thread pitch identification charts.

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What do the markings on the head of a fastener indicate?

For metric fasteners there are usually 2 pieces of information.

  1. A manufacturer marking which simply indicated the company that manufactured the fastener.
  2. The strength class which consists of two numbers separated by a decimal point. Common classes are 4.8, 8.8, 10.9, and 12.9. The number of the left indicates 1% of the tensile strength in MPa, or N/mm2. The number on the right indicates the proportion of the yield strength in relation to the tensile strength.
Example for Class 12.9
Left Digit 12 (Tensile Strength) Right Digit .9 (Yield Strength)
12 x 100 = 1200 MPa = 1200 N/mm2 .9 x 1200 = 1080 MPa = 1080 N/mm2
Conversion factor for psi = 145
1200 MPa x 145 = 174000 psi
Conversion factor for psi = 145
> 1080 MPa x 145 = 156600 psi
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Are you ISO certified?

Yes.  Fuller Metric Parts Ltd. is ISO 9001:2008 certified (certificate number CA1617). As a distributor, we have always taken great care in purchasing to ensure that our vendors supply goods which conform to quality standards.  Information on our quality system.


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