A-A-54554
Style, design and dimensions. The finger ring saw shall be designed to manually cut metal finger rings from the human hand without damage to patient’s fingers. The assembly shall consist of a blade that is accurately fitted to a bearing hub and bearing washer that is secured to the handle properly by means of a thumbpiece. The hub shall be designed to form a tight to interference fit (maximum 0.002 inch) with the blade. The thumbpiece shall be readily removed from the handle and bearing hub for easy replacement of the blade. The lever shall be removable, secured to the handle and designed to slip under a finger ring for cutting of the finger rings by manually turning the thumbpiece. The lever slot shall be in alignment with the blade, without the blade butting, jamming or hitting the lever when the lever is moved toward the blade. The washer, blade and hub components shall be readily assembled to each other in any order (i.e. both blade surfaces and both washer surfaces shall be capable of being placed onto the hub). For saws of style 1 design, the blade shall be prevented from cutting through the level by having the lever tip coming to a stop at the saw hub and washer. For saws of style 2 design, the lever shall be capable of restraining the blade for blade replacement, by manually turning the thumbpiece in a counter-clockwise direction. The blade shall possess well defined teeth, consistent depth and be in accordance with good manufacturing practice. The finger ring saw assembly, including the blade shall be in accordance with Defense Personnel Support Center (DPSC) Drawing No. 1820 for style 1 or style 2 design.
Finish. The finish of the finger ring saw assembly shall be smooth and uniform, free from cracks, burrs, sharp edges (except for blade teeth), pits, scale and corrosion.
Passivation. All components fabricated from austenitic or martensitic steel shall be properly passivated.
Corrosion resistance. The plating and corrosion requirements for components fabricated from copper alloy shall be in accordance with ASTM Standard B117, except that the corrosion test shall be the boil test only in accordance with ASTM F1089. Except for the blade, components fabricated from carbon steel shall comply with corrosion tests in accordance with ASTM F1089, except that the boil test only shall apply. Components fabricated from austenitic or martensitic steel shall show no corrosion or plating of copper when tested in accordance with ASTM F1089. Components fabricated from austenitic steel shall show no corrosion when subjected to boil test in accordance with ASTM F1089.
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