MIL-DTL-40137F
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection (see 4.2 and 6.3).
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements and promotes
economically advantageous life cycle costs.
3.3 Materials and components. Materials and components used shall conform to the
documents and standards referenced in PS70085, PS70086, and PS70087.
3.4 Construction. Fabrication of the components and assembly of the clevises shall
conform to the requirements of this document and the design details shown or specified in
PS70085, PS70086, or PS70087, as applicable.
3.4.1 Cross section dimensions. Cross sections of forged components may be cut
unsymmetrical or out of round due to die mismatch, flash trim, and cleaning processes. The
cross section contour at any point shall be within the maximum and minimum material condition
limits set by the dimensions and tolerances specified.
3.4.2 Heat treatment. Forged clevis components shall be heat treated as specified in the
applicable standard.
3.5 Finish.
3.5.1 Surface defects and roughness. Forged components shall be free from scale, burrs,
sharp edges, fins, cracks, and laps. Forging flash shall be removed substantially flush with the
adjacent surfaces. Surface roughness shall not exceed values specified on the applicable standard.
3.5.2 Protective finish. Unless otherwise specified (see 6.2), the protective finish for
metal components shall be as specified on the applicable standard.
3.6 Performance. Clevises shall be capable of withstanding proof loads specified in the
applicable standard without developing any evidence of failure, visible permanent deformation, or
defects that would interfere with disassembly when tested in accordance with 4.3.4.
3.6.1 Functional performance. The hardware shall meet all functional test and assembly
requirements specified in the applicable standard.
3.7 Marking for identification. Each clevis body shall be marked for identification with
the part number and the manufacturer's name or readily identifiable trademark. Forged clevis
pins shall be marked with the part number only. The marking shall be the size and in the
location shown in the applicable standard. The manufacturer may, at their option, utilize either
raised or indented marking. If raised marking is used, the height of the characters shall be
sufficient to insure legibility but shall not exceed 0.02 inches.
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