- 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:
- The DIN( which defines the style of the fastener)
- The material desired (i.e. 8.8 Steel, 316 Stainless, Hastelloy
C276)
- 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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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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For metric fasteners there are usually 2 pieces of information.
- A manufacturer marking which simply indicated the company that
manufactured the fastener.
- 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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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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