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MIL-S-21041C
*Class 1. Primer or phosphatized base and baked-on synthetic enamel of high grade commercial
quality. The method of paint application shall be at the discretion of the supplier provided it assures a
strong bond with the base metal. Color shall be DOD Gray, approximating chip 36321, unless otherwise specified
(see 6.2.2), in accordance with FED-STD-595.
*Class 2. Protective zinc coat per QQ-Z-325, Type 1, Class 3, electrodeposition, applied after
perforating, or by Hot Dipping process, per ASTM A-123 applied before or after perforating as specified (see 6.2).
Nuts and bolts shall be coated after machining is completed. Items manufactured from QQ-S-775, Class d material
will not require further coating to comply with this paragraph.
*Class 3. Same as Class 2 finish with the exception that a coating thickness of not less than 0.001" is
to be applied after perforating. The surface finish shall conform to Type 1, Class 1 of QQ-Z-325. The nuts and
bolts shall be coated after machining per QQ-Z-325, Type I, Class 3.
Class 4. Surface treatment in accordance with MIL-C-5541 (for aluminum alloy angle).
3.6
Handbook of Instructions. The contractor shall furnish one copy of instructions with each unit package
(see 6.2.1) of material under this specification. The instructions will cover assembly, illustrations, and technical
data concerning specified rating capacity using a safety factor of two for the horizontal and vertical length
according to the application and dimensions. (Deflection occurring at manufacturers' rated loads will also be
shown for the normal applications in the horizontal plane.) Additional copies may be ordered as required.
3.7
Workmanship. The finished material shall be first class in quality and appearance; free of defects,
blemishes, burrs, ragged or sharp edges, or breaks in coating or plating which would detract from appearance or
impair serviceability.
4.
QUALITY ASSURANCE PROVISIONS
*4.1
Responsibility for Inspection. Unless otherwise specified in the contract or purchase order, the supplier
is responsible for the performance of all inspection requirements as specified herein. Except as otherwise
specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government.
The Government reserves the right to perform any of the inspections set forth in the specification where such
inspections are deemed necessary to assure that supplies and services conform to prescribed requirements.
*4.1.1.
Component and Material Inspection. In accordance with 4.1 above, components and materials shall be
inspected and tested in accordance with all the requirements of reference specifications, drawings, and standards
unless otherwise excluded, amended, modified, or qualified in this specification or applicable purchase document.
4.2
Sampling for lot acceptance.
4.2.1
Inspection lot. All similar material of one kind offered for delivery at one time shall be considered a lot
for purposes of inspection.
4.2.2
Sampling for examination. A random sample of units shall be selected from each lot offered to the
Government in accordance with MIL-STD-105 at inspection level II. The acceptable quality level shall be 2.5
percent defective for major defects and 6.5 percent defective for minor defects.
5

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