Swage-locking pins and collars provide permanent, uniform high shear and tensile strength fastening for structural joints in hull structure, shipboard superstructure, ordnance, launchers, vehicles, ground support equipment, building assembly and structural steel erection, of which the following are typical examples:

(a) Superstructure connections, deckhouse attachment, joiner doors, lockers, ladders, vents, air ducts, and general shipboard maintenance.

(b) Structure fastenings: gunwale angles, shear strake, crack arrestors, bilge strakes, bilge keel, deck straps, bulwarks, access plates, smoke stacks.

(c) Gun shields, davits, life boats, loading and landing equipment, missile and rocket launcher equipment.

(d) Storage tanks, structural steel erection, prefab building assembly, and industrial cranes.

Types of pins and collars should be selected to effect proper joining and sealing by the use of suitable head contour in relation to the application, (see figure 8 for pin and collar detail). Fasteners conforming to this specification are intended to pull joint surfaces together to minimize gaps.

Where strength permits, carbon-steel type III, wide grip range pins (which were not covered in MIL-P-23469B) are preferred for new design because of their wider grip range over carbon steel type I pins. Type III pins have superior tensile strength to type I pins in all sizes, but inferior shear strength for ¼ inch through ⅜ inch nominal diameters.

This specification does not cover all the styles and sizes of codified swage-locking pins and collars commercially available. It is intended to cover only those styles, classes, and sizes which, are suitable for shipboard applications.