MIL-STD-1660A
4.5.1.1 Overhang. Unit loads shall be made up so as to ensure stability, to provide for efficient strapping application, and not to cause excessive bending force on those containers or items which may be structurally weak. When standard pallets are used (see 4.8.3), the recommended overhang should not exceed 2 inches per edge. Overhang greater than 2 inches can be allowed depending upon peculiarities of the commodity being unitized and identifiable factors that influence total cost effectiveness throughout the ammunition logistics system.
4.5.1.2 Underhang. Underhang shall not be permitted. When standard pallets are used, spacers, battens, or cap assemblies shall fill out the unit load so that the overall nominal view dimensions are at least flush with the pallet dimensions. The strength and dimensions of the materials shall be adequate to permit shipment by all means of transport, e.g., cap assemblies shall be of such size that it will withstand all loads imposed on it by adjacent unit loads under impact conditions. When non-standard pallets or skid bases are used, the overall plan view size shall be tailored not to exceed the load dimensions. Skid bases shall be in accordance with U.S. Army Defense Ammunition Center Drawing AMC 19-48-4116-20PA1002.
4.5.2 Transportability limitations. Unit loads shall be designed to be economically compatible with the methods by which they will be transported or stored. Guidance concerning the preferred length, width, and height characteristics for the more common conditions is given in table I.
4.5.3 Gross weight. Gross weight of an ammunition unit load shall not exceed 4,000 pounds unless specifically authorized by each using activity.
4.5.4 High density ammunition. Where optimization in all three dimensions produces a gross weight greater than 4,000 pounds, the number of complete layers of unit packs shall be reduced until the gross weight is less than
4,000 pounds.
4.5.5 Special rule for amphibious assault ammunition. Certain ammunition items are intended to be used in amphibious operations. This ammunition, at least during the assault phases, must be capable of being efficiently handled in specialized ships with fixed size elevators and horizontal or vertical conveyors. Maximum dimensions for these unit loads are:
a. Maximum length and width: 45 by 54 inches b. Maximum height: 44 inches
c. Maximum weight: 3,000 pounds
4.6 Stability. Item placement shall be such that the assembled unit load is stable on a motionless level surface without depending on strapping. This criterion shall also apply following the rough handling tests of 5.4.2 to 5.4.9 if the assembly is not distorted by more than 2 inches.
4.7 Stacking capability. Unless otherwise specified by the design activity (see 6.2), unit loads shall be designed to ensure safe, stable, long-term stacking to an overall height of 16 feet.
4.8 Materials. Standard parts and materials shall be used unless they are technically or economically impractical. The material used shall not adversely affect the unitized items because of incompatibility of hydroscopic or chemical properties.
4.8.1 Strapping. All strapping shall be in accordance with ASTM D3953, Type 1, Heavy Duty, Finish B (Grade 2), brite or slit edges shall have Finish A overlay. Typical strapping size used for unit loads is % inch or 11/4 inch wide by 0.035 inch or 0.031 inch thick. Current approved clipless tools for U.S. Army Ammunition loads are specified in U.S. Army Defense Ammunition Center Drawing ACV00617.
4.8.2 Strapping seals. All seals for metallic strapping shall be in accordance with ASTM D3953, Class H, Finish B (Grade 2), double notch type, Style I, II, III, or IV. If all surfaces are painted, an allowable alternative seal finish Signode or Delta painted seal may be used. Gritted backing is not permitted. Designs shall be based on the use of a single seal, double notched. Use of crimped seals is authorized with non-lubricated strapping provided two seals are used, each double crimped.
Source: https://assist.dla.mil -- D9ownloaded: 2014-09-28T13:04Z Check the source to verify that this is the current version before use.
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