MIL-DTL-21338B
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of
a conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws
and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Materials. Materials used in the manufacture of washers shall be homogeneous in
structure, free from laminations, inclusion of nonmetallic impurities, and such other defects as
would render the material unsuitable for its intended purpose and shall be in accordance with
3.1.1, 3.1.2, or 3.1.3, as applicable.
3.1.1 Carbon steel. Type I, Class 1 washers shall be made from carbon steel conforming
to SAE AIR4127 Steel Numbers 1005 to 1035, inclusive.
3.1.2 Corrosion-resisting steel. Type I, Class 2 washers shall be fabricated from corrosion-
resisting steel conforming to SAE AIR4127 Steel Numbers 302, 303, or 304.
3.1.3 Alloy steel. Type II, Class 1 washers shall be made from an alloy steel conforming to
SAE AIR4127 Steel Number 8735.
3.2 Surface roughness. Surface roughness of Types I and II washers shall not be greater
than a minimum roughness height rating of 250. Surface roughness shall be interpreted in
accordance with the provisions of ASME B46.1.
3.3 Tolerances. Tolerances for Type I and II washers shall be plus or minus 0.010 inch for
linear dimensions and plus or minus 2 degrees for angular dimensions.
3.4 Design, sizes, and dimensions. Unless otherwise specified in the contract or order,
washers shall conform to the designs, sizes, dimensions, and other requirements specified
herein and on MS19069 and MS19070.
3.5 Tangs. The tangs shall be equally spaced, uniform and symmetrical with respect to
size, shape, and angle.
3.6 Bending. Washers shall be capable of being bent without fracture, as specified in test
method 4.4.1.
3.7 Protective coating and treatment. Unless otherwise specified in the contract or order
(see 6.2), washers shall be plated, coated, or treated in accordance with 3.7.1, 3.7.2, or 3.7.3.
3.7.1 Zinc plating. Zinc plating shall be in accordance with ASTM B633, Class 5, Type II.
3.7.2 Phosphate coating. Phosphate coating shall be in accordance with MIL-DTL-16232,
Type Z, Class 2.
3.7.3 Passivation. Corrosion-resisting steel shall be passivated in accordance with SAE
AMS2700, Method 1, Type II.
3.7.3.1 Other methods of passivation may be substituted in lieu of 3.7.3 only upon prior
approval of the procuring activity.
3.8 Hardness.
3.8.1 Carbon steel. The hardness of carbon steel washers in the annealed condition shall
be Rockwell B50 minimum to Rockwell B81 maximum.
3.8.2 Corrosion-resisting steel. Corrosion-resisting steel washers shall be in the annealed
condition and at a hardness of 70 Rockwell B minimum to 90 Rockwell B maximum.
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