Any specifications for MIL-SPEC hardware (such as AN, MS and NAS parts)
includes the tests that parts are required to pass to qualify as
MIL-SPEC parts. As a service to its valued customers,WCL offers the
following as a general guide to test and certification requirements
for the MIL-SPEC hardware items it sells.
Flat Washers
MIL-SPEC designations for flat washers include, but
are not limited to,AN960, MS15795, MS27183,NAS620, and
NAS1252.
These are covered by military procurement specification
FF-W-92 which has, as minimum requirements.
1. Chemical analysis
2. Process certification on protective finish
3. Workmanship
4. Magnetic permeability (stainless steel only)
Helical Spring Lock Washers
MIL-SPEC designations include, but are not limited to,
MS35338, MS35340, MS51848, NAS1640 and NAS1676. These
are covered by military procurement specification ASME
B18.21.1 or FF-W-84 which has some, or all, of the following.
1. Interlinking test
2. Free height test
3. Twist test
4. Pressure test
5. Hardness test
6. Chemical analysis (mill certification acceptable)
7. Magnetic permeability (on stainless steel)
8. Process certification on protective finish
9. Decarb test (on carbon steel)
10. Embrittlement test (electro plated)
Spring Washers - Curved,Wave and Belleville
MIL-SPEC designations for spring washers include but
are not limited to, M12133/1 and M12133/2 and are covered
by military specification MIL-W-12133 which has, as minimum
requirements:
1. Chemical analysis
2. Process certification on protective coating
3. Inspection for cracks
4. Hardness test
5. Decarburization (carbon steel only)
6. Load Deflection and surface treatment
7. Permanent set
8. Repeated loading
Tooth Lock Washers
MIL-SPEC designations for tooth lock washers include,
but are not limited to MS35333, MS35335, MS35336, MS35790
and MS45904. These are covered by military procurement
specification ASME B18.21.1 or FF-W-100 which has some
or all of the following.
1. Hardness test
2. Process certification on protective finish
3. Chemical analysis
4. Compression and flattening test
9. Embrittlement test (electro plated)
5. Spread test
6. Twist test
7. Temper test
8. Decarb test (on carbon steel)
The above list provides a guide relating to the most
popular types of MIL-SPEC washers. It should not be construed
as a complete list of all military specifications and
documents pertaining to washers or as a list of all tests
or analysis that may be required.
Many OEM’s also have special requirements (including
testing) that must be met to be in compliance with their
part specifications and purchase requirements.
Review all relevant documents carefully before requesting
quotations to avoid unexpected costs for testing and
analysis. When in doubt, discuss the requirements with
your WCL sales associates.
Remember, if it has not been properly tested, it is
not MIL-SPEC hardware.
View, download, or print the PDF file
which contains the specifications: Flat Washers - Military Specifications |
WCL
stocks one of the nation’s most comprehensive lines
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leading manufacturers. With our state-of-the-art information
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in stock that’s similar to what you need. We know
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