This specification covers boxes that are intended to be used for the protection, stowage and storage of supply support items for mechanical, electrical and electronic equipment.

Type M boxes are intended for the protection of on board supply support items stowed in boxes aboard ship. The type M box is also intended for use where permanent storage facilities for supply support items accompanying an equipment are not available at shore installations.

Type W boxes are intended for the protection of on board supply support items stowed on ships where a low magnetic signature is important (such as wood hulled minesweepers). Type W boxes are not intended for use as a shipping container to be disposed of after use.

This specification is not intended to cover the types of boxes used as shipping containers and boxes from which supply support items are removed for stowage in bin or drawer type stowage systems on board ship.