ASME B107.17-2020 pdf download

ASME B107.17-2020 pdf download.Gages and Mandrels for Wrench Openings.
SCOPE This Standard establishes final inspection gage sizes and test mandrel sizes for wrench openings and spark plugwrench openings forinch and metric sizes. This Stan- dard does not cover every available size, only those most commonly manufactured. 2 APPLICATION The gages covered by this Standard shall be used to ensure the manufacture of conforming products in inch and metric sizes. 3 REFERENCES The following document is referenced in this Standard. The latest edition shall be used. ASTM E18, Standard TestMethods for Rockwell Hardness 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 (www.astm.org) 4 REQUIREMENTS The gages shall be similar to those shown in Figure 4-1 forhexgages and Figure 4-2 forsquare gages. Dimensions in inch series tables are in inches, and dimensions in metric series tables are in millimeters, exceptas specified. 4.1 Material 4.1.1 Gages. The gages shall be made ofsteel, suitable for the purpose intended, and hardened to 60 HRC minimum. The hardness shall be tested using procedures outlined in ASTM E18. 4.1.2 Mandrels. The mandrels shall be made of steel, suitableforthepurposeintended,andhardenedto56HRC minimum. The hardness shall be tested using procedures outlined in ASTM E18. 4.2 Gage Use and Design The gages shall be of the sizes and tolerances given in Tables 4.2-1, 4.2-1M, 4.2-2, 4.2-2M, 4.2-3, and 4.2-3M. Formulas are provided for sizes not listed.
The gages shall be used in accordance with accepted practices. Manufacturers may use gages with tighter dimensions than those shown herein. The size for all limits (GO and NO GO) gages shall not exceed 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 the gage size specified within this Standard. Thus a gage that represents a minimum limit may be larger, but never smaller, than the minimum size specified; likewise, the gage thatrepresents a maximum limitmaybe smaller, but never larger, than the maximum size specified. 4.2.1 Rounding Method. A rounding method shall be usedfordeterminingdimensions forgages. Whenthenext digit beyond the last digit to be retained is (a) less than 5, the last digit to be retained is not changed (b) 5 or more, the last digit to be retained is increased by one 4.3 Mandrels Use and Design 4.3.1 Mandrels for Nut End Socket Openings. The hexagon mandrels shall be of the size and tolerances giveninTables 4.3.1-1 and4.3.1-1M. The squaremandrels shallbeofthesizeandtolerancegiveninTable4.3.1-2.The mandrel shall be inserted into the nutend socketopening to the depth indicated in the applicable table. 4.3.2 Mandrels for Wrench Openings. The hexagon mandrels shall be of the size and tolerances given in Tables 4.3.1-1, 4.3.1-1M, and 4.3.1-2. The mandrel shall be fully engaged to the thickness of the wrench head.Rounding and determination of the NO GO Gage C value for inch series shall be as follows: W is rounded to three decimal places for all calculations, numbers within parentheses are rounded to three decimal places before adding to the formula, and Wis added to the numbers within parentheses before addingthe lastvalue in the NO GO formula, with the gage dimension leftas a four-place decimal. Use the rounding method in para. 4.2.1. (e) Foradditional sizes notlisted in Table 4.2-1, dimensions are determinedas follows: To determine GO Gage Adimensions forWnominal sizes (all calculations mustbe done in inches), GO Gage A = W(value to four decimal places, notrounded) + incremental amountfrom Table 4.2-2. Round GO Gage A value to four decimal places. Use the rounding method in para. 4.2.1.