MIL-DTL-27235B
4.4.3 Shear strength. Pins taken as specified in 4.2.2.2 shall be subjected to a shear
strength test to determine conformance to 3.4. The pin shall be placed in a hole that passes
through a shear block and a plunger within the block. The maximum clearance between the
shearing planes of the block and the plunger shall be 0.005 inch. The block and plunger shall be
constructed so that the shear planes are normal to the longitudinal axis of the pin being tested.
The block and plunger shall be made of hardened steel or shall have steel inserts with a minimum
shearing surface hardness of Rockwell C65. The clearance or interference between the pin and
pinhole of the block and plunger shall be within the limits of Table II. The pin to be tested shall be
assembled to the block and plunger, with the two ends of the pin at least one pin diameter away
from the shear planes. For pins covered by MS35810, the load applied to the plunger shall be as
shown on tihe standard for minimum double shear. For other pins, the load applied to the plunger
shall be calculated from the minimum ultimate shear specified in 3.1.1, 3.1.2 or 3.1.3, as
applicable. If fracture occurs in the pin under the applied shear load, the pin shall be considered
defective. Pins too short to be tested in double shear shall be tested by applying the test to two
pins simultaneously in single shear. Pins shall be tested in full size (diameter) whenever
practicable. If it is not practical to test the full size pin, a test specimen shall be cut from the pin
and machined to the diametrical dimensions of a smaller size pin, and tested as above.
TABLE II. Pin Clearance and Interference.
Pin size (Inch)
Max. Clearance (Inch)
Max. Interference (Inch)
1/16 to 3/16
0.0003
0.0002
1/4 to 7/16
0.0004
0.0003
1/2 to 5/8
0.0005
0.0003
3/4 to 1
0.0006
0.0004
4.4.3.1 Alternate shear test. If so desired by the supplier, pins may be tested in single shear
provided that all requirements, other than double shear, of 4.4.3 are met.
4.4.4 Passivation. Each pin selected as specified in 4.2.2.3 shall be subjected to a
passivation test conducted in accordance with SAE AMS-QQ-35.
4.5 Rejection and resubmission. Rejection and resubmission of lots shall be in accordance
with ASQ Z1.4.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity
to ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system commands. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but
is not mandatory.)
6.1 Intended use. Clevis pins are intended for use in equipment for fastening clevises and
eyes.
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