Transcription of WRENCH OPENINGS FOR SQUARE NUTS AND HEX …
1 NUTSWRENCH OPENINGS FOR SQUAREAND HEX NUTSAPPENDIX (R1999)Nominal Sizeof WrenchAlso Basic(Maximum)Width AcrossFlats of Nuts7/16 ,NotesAllowanceBetweenNut Flatsand Jawsof FlatHex Flat JamHexHex JamHex SlottedHex ThickHex Thick SlottedHeavy SquareHeavy Hex FlatHeavy Hex Flat JamHeavy HexHeavy Hex JamHeavy Hex SlottedNominal Nut Sizes1/4 5/163/8 7/161/2 5/8 3/47/8 11-1/8 1-1/41-3/8 1-1/2 1/45/163/8 7/161/2 9/165/8 3/47/8 1 1-1/8 1-1/41-3/8 1-1/2 1/45/16 3/87/16 1/29/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/21-5/81-3/41-7/822-1/42-1/22-3/433-1 /43-1/23-3/44cD 22 NOTES:1.
2 Wrenches are normally marked with the "Nominal Size of WRENCH " which corresponds to the basic (maximum, inmost cases) width across flats dimension of the respective nut. For specific requirements applicable to wrenches,refer to the appropriate American National Standard, ANSI B107 document, which covers the particular WRENCH Allowance (minimum clearance) between maximum width across flats of the nut and jaws of WRENCH equals ( + ). Tolerance on WRENCH opening equals plus ( + from minimum). W equals nominal size ofwrench. 2003 Industrial Fasteners Institut
