MIL-DTL-20277K
4.7 Test methods.
4.7.1 Visual examination. Continuous examination shall be performed to assure compliance with the
following requirements:
a.
Design, construction and physical dimensions (see 3.4).
b.
c.
Color (see 3.5).
Marking (see 3.7).
d.
e.
Workmanship (see 3.8).
hardness of the steel shall be determined as specified in ASTM E18, hardness scale C. The following
details shall apply:
a. The hardness of the blade shall be determined at the heel, center and point not less than .25
inch (6.35 mm) from the cutting edge.
b. The hardness of the tang in the transition area shall be determined in the center on the
opposite side to the marking.
c. Three hardness determinations shall be made on the remaining portion of the tang evenly
distributed along its length.
4.7.3 Holding of the knife by strap (see 3.6.2). The effectiveness of the strap in holding the knife in
the sheath shall meet the requirements of 3.6.2. The following details shall apply:
a. With the strap snapped shut over the handle of the sheathed knife, grasp the sheath near the
tip end without pinching the blade; raise the arm overhead with the knife butt in the uppermost,
then suddenly swing the arm downward through an arc in a rapid motion, stopping suddenly at
the bottom of the arc.
b. The guard of the knife shall not have moved away from the sheath at the completion of this
hurl.
blade is tested by cutting at least ten shavings, not less than .0625 inch (1.59 mm) thick, from a strip of
oak or other wood of similar hardness. The following details shall apply:
a. The blade shall enter into the wood at an angle of not less than 30° and all portions of the
cutting edge shall be capable of producing a clean cut without undue effort.
b. After ten shavings have been cut, the blade, shall have no defects in the cutting edge.
4.7.5 Flexibility (see 3.6.4). The knife shall meet the requirements of 3.6.4 when tested for flexibility.
The following details shall apply:
a. The tip of the blade shall be secured by inserting the tip into a contoured metal fixture to a
depth of 1.5 inches (38 mm) from the point.
b. Pressure shall be of such magnitude that it shall cause bending of the blade through an angle
of 9°.
c. The blade shall not break during the bending and when the pressure is removed, the blade
shall return to the original shape with no deformation.
4.7.6 Fungicide (see 3.3.5). When tested in accordance with MIL-DTL-32068 the amount of
thiocyanomethylthio benzothiazole, Ortho-phenyl phenol or diiodomethyl para tolysulfone shall be in
accordance with MIL-DTL-32068.
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