ASME B107.17 pdf download Gages and Mandrels for Wrench Openings
This Standard establishes final inspection gage sizesand test mandrel sizes for wrench openings and sparkplug wrench openings for inch and metric sizes. ThisStandard does not cover every available size,but onlythose most commonly manufactured.
The gages covered by this Standard shall be used toensure the manufacture of conforming products in inchand metric sizes.
Standard. The latest edition shan be usea. RockwellASTME18,stantaarc Materials.ialeHardness of Metallic Materials
Publisher: American Society for Testing and Materials(ASTM International)，100 Barr Harbor Drive,P.O.Box C700,West Conshohocken, PA 19428-2959
The gages shall be similar to those shown in Fig. 1for hex gages and Fig. 2 for square gages. Dimensionsin inch series tables are in inches,and dimensions inmetric series tables are in millimeters,except asspecified.
4.1.1 Gages.The gages shall be made of steel, suit-able for the purpose intended and hardened to 60 HRCminimum. The hardness shall be tested using proce-dures outlined in ASTM E18.
4.1.2 Mandrels.The mandrels shall be made ofsteel,suitable for the purpose intended, and hardened to 56HRC minimum. The hardness shall be tested usingprocedures outlined in ASTM E18.
4.2 Gage Use and Design
The gages shall be of the sizes and tolerances givenin Tables 1,1M,2,2M, 3, and 3M. Formulas are providedfor sizes not listed.
The gages shall be used in accordance with acceptedpractices. Manufacturers may use gages with tighterdimensions than those shown herein.
The size for all limits (GO and NO GO) gages shall notexceed the extreme limits specified herein. All variations(manufacturing tolerance, calibration error, wear allow-ance , etc.) in the gages, whatever their cause or purpose,shall bring these gages within the extreme limits of thisgage size specified within this Standard. Thus a gagethat represents a minimum limit may be larger, but neversmaller, than the minimum size specified; likewise, thegage that represents a maximum limit may be smaller,but never larger, than the maximum size specified.4.2.1 Rounding Method. Rounding method is to beused for determining dimensions for gages. When thenext digit beyond the last digit to be retained is
(a) less than 5, the last digit to be retained is notchanged
(b)5 or more,the last digit to be retained is increasedby one
4.3 Mandrels Use and Design
4.3.1 Mandrels for Nut End Socket Openings.Thehexagon mandrels shall be of the size and tolerancesgiven in Tables 4 and 4M. The square mandrels shall beof the size and tolerance given in Table 5. The mandrelshall be inserted into the nut end socket opening to thedepth indicated in the applicable table.
4.3.2 Mandrels for Wrench Openings.The hexagonmandrels shall be of the size and tolerances given inTables 4, 4M, and 5.The mandrel shall be fully engagedto the thickness of the wrench head.