ASME B18.2.2 pdf free download
ASME B18.2.2 pdf free download Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)
1INTRODUCTION1.1 Scope
1.1.1 This Standard is intended to cover the com-plete general and dimensional data for the various typesof inch series square and hex nuts,including machinescrew nuts and coupling nuts, addressed by this Stan-dard. Also included are appendices covering gaging ofslots in slotted nuts, wrench openings for nuts, formulason which dimensional data are based,and measurementof bearing surface runout. It should be understood thatwhere questions arise concerning acceptance of product,the dimensions in the tables shall govern over recalcula-tion by formula.
1.1.2 The inclusion of dimensional data in thisStandard is not intended to imply that all of the productsdescribed herein are stock production sizes.Consumersare requested to consult with manufacturers concerninglists of stock production sizes.
1.2 Comparison to lso Standards
There are no comparable ISO inch fastener standards.1.3 Dimensions
Unless otherwise indicated, units of measurement areexpressed in inches.
1.4Options
Where options are allowed, they shall be selected atthe manufacturer’s discretion unless otherwise specifiedby the purchaser.
1.5 Terminology References
For definitions of terminology not specifically definedin this Standard, refer to ASME B18.i2.
REFERENCES
Unless otherwise specified, the standards referencedshall be the latest edition at the time of order placement.ASME B1.1,Unified Inch Screw Threads (UN and UNRThread Form)
ASME B1.3，Screw Thread Gaging Systems forAcceptability: Inch and Metric Screw Threads (UN,UNR,UNJ,M, and MJ)
ASME B18.12,Glossary of Terms for MechanicalFasteners
ASME B18.18,Quality Assurance for Fasteners
ASME B18.24,Part ldentifying Number (PIN) CodeSystem for B18 Fastener Products
ASME B107 Series,Standards for Hand Tools
Publisher: The American Society of MechanicalEngineers (ASME),Two Park Avenue, New York, NY10016-5990 (www.asme.org)
ASTM A563,Standard Specification for Carbon andAlloy Steel Nuts
ASTM F467 ,Standard Specification for Nonferrous Nutsfor General Use
ASTM F594,Standard Specification for Stainless SteelNuts
ASTM F1941,Specification for ElectrodepositedCoatings on Threaded Fasteners [Unified Inch ScrewThreads (UN/UNR)]
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)
SAE J995,Mechanical and Material Requirements forSteel Nuts
Publisher: SAE International,400 Commonwealth Drive,Warrendale, PA 15096 (www.sae.org)
3GENERAL DATA
3.1 Width Across Flats
The width across flats of nut shall be the overall dis-tance measured, perpendicular to the axis of nut,between two opposite sides of the nut in accordancewith the notes on respective dimensional tables.
Maximum width across flats shall not be exceeded,except as stated below. No transverse section throughthe nut between 25% and 75% of the actual nut thicknessas measured from the bearing surface shall be less thanthe minimum width across flats.
NOTE: Nonferrous milled-from-bar hex nuts: The minimumacross flats dimensions of nonferrous milled-from-bar hex nutsshall not be less than the values tabulated in Tables 1-1 through13.The maximum across flats size may be greater than the tabu-lated values in Tables 1-1 through 13, but shall not be equal to or greater than the minimum wrench opening shown in Table B-1, Nonmandatory Appendix B.
3.2 Corner Fill A rounding or lack of fill at junction of hex corners with chamfer shall be permissible, provided the width across corners is within specified limits at and beyond a distance equal to 175% of the basic thread diameter from the chamfered face.
3.3 Tops of Nuts and Chamfers Tops of nuts shall be flat and chamfered. Unless otherwise speified by the purchaser or in this Standard, nuts in sizes % in. nominal size and smaller shall be double- chamfered. Larger size nuts shall be double-chamfered or have washer-faced bearing surface and chamfered top.
3.3.1 Single-Chamfered Nuts and Washer-Faced Nuts. Diameter of the chamfer circle shall be equal to the maximum width across flats within a tolerance of -15%. The length of chamfer at hex corners shall be from 5% to 15% of the basic thread diameter. The surface of the chamfer may be slightly convex or rounded.
3.3.2 Double-Chamfered Nuts. Diameter of the chamfer circle shall be equal to the maximum width across flats with a -10% tolerance.
3.4 Countersink Unless otherwise specified in this Standard, tapped holes shall be countersunk on the bearing faces. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for % in. nominal size nuts and smaller, and 1.08 times the basic major diameter for nuts larger than %g in. No part of the threaded portion shall project beyond the bearing surface.
3.5 Nut Thickness The nut thickness shall be the overall distance, mea- sured parallel to the axis of nut, from the top of the nut to the bearing surface and shall include the thickness of the washer face where provided.
3.6 Washer Face Diameter Unless otherwise specified, the outside diameter ol washer face shall be equal to the maximum width across flats with a – 10% tolerance.
3.7 Slots When speified in the respective dimensional table, slots shall be normal to nut flats. Contour of bottom of slots shall be at manufacturer’s option. Requirements for gaging slots are specified in Mandatory Appendix I.
