ASME B107-12 pdf download Nutdrivers
4.1.3 Type II: Stubby Length. Type II nutdrivers shall consist of round steel shaft with socket at one end and a handle at the other end. A bolt clearance hole shall be provided in the shaft of the socket end. The nutdriver shall be similar to Fig. 3 and conform to Table 3 or 3M for the size specified. Style A nutdrivers shall be provided with a conventional color-coded handle and/ or shaft. Style B nutdrivers shall be provided with a cushion grip handle and need not be color-coded.
4.1.4 Type III: Miniature Handle. Type III nutdrivers shall consist of a round steel shaft with a socket at one end and a handle at the other end. A bolt clearance hole shall be provided in the shaft socket end. The nutdriver shall be similar to Fig. 4 and conform to the Table 4 or 4M for the size specified. Handle and/or shaft shall be color-coded.
4.2 Materials The materials used in the manufacture of nutdrivers shall be such as to produce tools conforming to the requirements specified herein.
4.3 Marking Nutdrivers shall be marked in a plain and permanent manner with manufacturer’s name or with a trademark of such known character that the manufacturer shall be readily determined. Marking shall include the product number and nominal socket opening size. Marking shall be as permanent as the normal life expectancy of the nutdriver to which it is applied (providing the marked surface has not been subjected to a fretting or abrading action) and be capable of withstanding the cleaning procedures normally experienced during its intended use.
4.4 Hardness The socket shall be hardened to not less than 35 HRC, or case-hardened 0.005 in. (0.127 mm) deep (minimum) to a hardness not less than 89 HR15n when tested in accordance with ASTM E 18. When surface preparation is necessary, the amount of material removed in the area contacted by the indenter shall not exceed 0.007 in. (0.178 mm).
4.5 Tests Nutdrivers shall pass the tests specified in paras. 5.1 and 5.2 and the applicable tables without failure or permanent deformation (set) that might affect durability or serviceability.
4.6 Socket Opening Socket openings shall be 6-point and conform to the gaging requirements of ASME B107.17M. Manufactur- ing process or pilot holes, if present in the socket openings, shall not exceed the minimum allowable across flats dimension times 1.04.
4.7 Shaft Finish
4.7.1 Surface Finish. Socket and shaft surfaces shall have a rust preventive treatment and be essentially free from pits, nodules, burrs, cracks, and other conditions that would adversely affect the performance or safety of the tool. When provided, coatings shall be adherent, smooth, continuous, and free from any conditions that would interfere with their protective value, safety, and function. The socket and shaft shall have a maximum of 125 ?in. (3.18 ?m) [arithmetic average] finish when tested in accordance with ASME B46.1. All edges and corners shall be smooth.