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ASME B107.21-2005 pdf download

ASME B107.21-2005 pdf download.Wrench, Crowfoot.
1 SCOPE This Standard provides performance and safety requirements for crowfoot wrenches having a wrench component of the open end type or flare nut type. Each type is designed to receive the external drive end of a socket wrench handle. Inclusion of dimensional data in this Standard is not intended to imply that all of the products described herein are stock production sizes. Consumers are requested toconsultwithmanufacturersconcerninglists of stock production sizes. 2 CLASSIFICATION Type I: Crowfoot wrench, flare nut Class 1: Standard duty (see Fig. 1) Class 2: Heavy duty (see Fig. 2) Type II: Crowfoot wrench, open end Class 1: Standard duty Class 2: Heavy duty 3 NORMATIVE REFERENCES The following is a list of publications referenced in this Standard. ASME B107.4M-1995, Driving and Spindle Ends for Por- table Hand, Impact, Air, and Electric Tools (Percussion Tools Excluded) ASME B107.17M-1997, Gages, Wrench Openings, Ref- erence Publisher: The American Society of Mechancial Engi- neers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 ASTM B 117-97, Standard Practice for Operating Salt Spray (Fog) Apparatus ASTM B 537-70 (1997), Standard Practice for Rating of Electroplated Panels Subjected to Atmospheric Exposure ASTM B 571-97, Standard Test Methods for Adhesion of Metallic Materials ASTM D 968-93, Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive ASTM E 18-2000, Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials Publisher: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 1 Guide to Hand Tools — Selection, Safety Tips, Proper Use and Care Publisher: Hand Tools Institute (HTI), 25 North Broad- way, Tarrytown, NY 10591 4 REQUIREMENTS The illustrations shown herein are descriptive and not restrictive, and are not intended to preclude the manufacture of wrenches that are otherwise in accor- dance with this Standard. 4.1 Marking Each wrench shall be marked in a permanent manner with the nominal wrench opening size and the manufac- turer’s name or trademark of such known character that the manufacturer may be readily determined. 4.2 Materials Thematerials used inthe manufactureofthewrenches shall be such as to produce wrenches conforming to this standard. 4.3 Hardness The wrench shall be heat treated to a hardness of 38 HRC to 54 HRC. 4.4 Proof Torque When tested as specified, wrenches shall withstand the proof torque specified in the applicable tables with- out failure or permanent deformation (set), which might affect durability or serviceability of the wrenches. 4.5 Wrench Openings 4.5.1 Wrench openings shall be such as to ensure acceptancewhengagedwithgagesconformingto ASME B107.17M. 4.5.2 Internal drive end dimensions shall conform to ASME B107.4M, except as noted in para. 4.7. Two sides of the internal drive square shall be parallel to the longitudinal axis of the socket wrench within ±3 deg.
When the internal drive end is furnished with a hole or recess for engagement of the ball/plunger on corres- ponding external drive end and the length of engage- ment of the external drive tang is less than twice the dimension of D f in Table 7 of ASME B107.4M, the hole or recess shall be central in the corresponding internal drive. 4.7.1 Type I, Flare Nut. Type I wrenches shall have the flare nut design (see Figs. 1 and 2). The wrench shall have an internal drive opening at one end and a wrench opening to drive hexagonal fasteners. See Tables 1 through 4M. The slotted opening may be rotated from the center- line of wrench. 4.7.2 Type II, Open End. Type II wrenches shall have the open end design (see Fig. 3). The wrench shall have an internal drive opening at one end and open wrench end at the other end. See Tables 5 through 7. 5 TEST PROCEDURES The tests specified herein are inherently hazardous and adequate safeguards for personnel and property shall be employed in conducting these tests. 5.1 Hardness Hardness shall be tested in accordance with ASTM E 18. When surface preparation is necessary, the amount of material removed shall not exceed 0.007 in. (0.18 mm) in the area contaced by the indenter.

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