MIL-DTL-20277K
3. REQUIREMENTS
3.1 Specifications sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheet. In the event of any conflict between the requirements
of this specification and the specification sheet, the later shall govern.
3.2 First article. When specified (see 6.2), a sample, shall be subjected to first article inspection in
accordance with 4.5.
3.3 Materials. Materials shall be as identified herein or as approved by the acquiring activity.
However, when a specific material is not specified, a material shall be used which will enable the combat
knife and sheath to meet the performance requirements of this specification. Acceptance or approval of
any constituent material shall not be construed as a guarantee of acceptance of the finished product.
3.3.1 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered,
environmentally preferable, or biobased 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.
3.3.2 Hazardous substances. The use of hazardous substances, toxic chemicals, or ozone depleting
chemicals shall be avoided, whenever feasible.
3.3.3 Other materials. Materials not otherwise specified shall be in accordance with applicable
specifications and to the requirements specified herein. All materials that are not specifically described
shall be of the highest quality and suitable for the purpose intended.
3.3.4 Leather tanning. Leather shall be vegetable tanned in accordance with MIL-DTL-32068. Color
fastness not applicable.
3.3.4.1 Sheath leather. The leather used on the sheath shall be in accordance with MIL-DTL-32068,
type II, class 1.
3.3.4.2 Combat knife handle. Combat knife handle shall be leather in accordance with
MIL-DTL-32068, type I through IV, class1.
3.3.5 Fungus proof materials. All leather components shall be treated with a fungicidal agent in
accordance with MIL-DTL-32068 to render the material fungus-resistant, see 4.7.6.
3.3.6 Handle strap. The handle strap shall be closeable with combat knife inserted and shall restrain
the combat knife handle from movement, see MIL-DTL-20277/2.
3.3.7 Blade and tang material. Steel in accordance with ASTM A29/A29M, type 1095.
3.3.8 Pin, butt plate, and guard material. Steel in accordance with ASTM A29/A29M, type 1018 or
1020.
3.3.9 Blade hardening. The finished blade shall be hardened and tempered in accordance with SAE-
AMS-H-6875. The hardness of the steel shall be tested in accordance with 4.7.2. The Rockwell
hardness range shall be from C55 to C58. There shall be a hardness transition zone from the heel of the
blade to .75 inch (19.05 mm) onto the tang, having a Rockwell hardness of C35 to C45 at the midpoint.
The remainder of the tang shall have a maximum Rockwell hardness of C30. After hardening the blade
shall have a fracture grain size no courser than 8 when tested in accordance with ASTM E112.
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