ASME B107.35M:1997 pdf download NUT DRIVERS (SPIN TYPE SCREWDRIVER GRIP) (METRIC SERIES)
4 REQUIREMENTS
4.1 Illustrations The illustrations shown herein are descriptive and not restrictive, and are not intended to preclude the manufacture of nut drivers which are otherwise in accordance with this Standard.
4.2 Materials The materials used in the manufacture of nut drivers shall be such as to produce tools conforming to the requirements specified in this Standard.
4.3 Marking Each item shall be marked in a legible manner with the manufacturer’s name, country of manufacture, product number, and nominal socket opening size. The method of marking shall be such that.it will endure the normal usage for a nut driver for an extended period of time.
4.4 Hardness The socket shall be hardened to not less than 35 HRC, or case hardened 0.13 mm deep (minimum) to a hardness not less than 89 HRl5n. When surface preparation is necessary, the amount of material removed in the area contacted by the indenter shall not exceed 0.18 mm.
4.5 Test Loads When tested as specified, nut drivers shall be capable of withstanding the test loads specified in the applicable tables without failure or permanent deformation (set) which might affect durability or serviceability.
4.6 Socket Opening The nut or engaging surfaces (load bearing) of the socket shall be well defined single hexagon (6 point). The socket opening dimensions and tolerances shall conform to the gauging requirements of ASME B107.17M before and after testing, as set forth in paras. 5.3.1 and 5.3.2. The socket opening shall be single hexagon (6 point). Manufacturing process or pilot holes, if present in the socket openings, shall not exceed the minimum allowable across flats dimension times 1.04.
4.7 Finish
4.7.1 Coatings. The external surfaces of sockets, shanks, and internal drivers shall be treated in a manner to resist rust or corrosion (see para. 4.8.3). There shall be no evidence of peeling or chipping of external finishes.
4.7.2 Surface Roughness. The socket and shank shall have a maximum of 3.2 pm in accordance with ANSUASME B46.1. All edges and comers which may be potentially injurious shall be smooth.
4.8 Handles The handles shall be of suitable material capable of withstanding the handle tests specified in para. 5.4.
4.8.1 Color Coding. When specified, handles and/ or shanks shall be color coded in accordance with the following chart.
4.8.2 Handle Shape,md Finish. Handles shall be suitably shaped and finished to provide a comfortable grip. They shall be free from rough edges, sharp comers, or tool marks that affect the appearance and comfort of the tool. They shall meet the dimensional requirements specified in the applicable tables.
4.8.3 Handle with Internal Drive. When speci- fied, handles shall be provided with a 6.3 or 10 mm square internal drive opening. Square drive dimensions and tolerances shall be in accordance with ASME