ASME B18.16.4-2008 pdf download.Serrated Hex Flange Locknuts 90,000 psi (Inch Series).
1 SCOPE This Standard covers the general, dimensional, and mechanical performance requirements for low strength carbon steel, case hardened, regular and large serrated flange locknuts (inch series), recognized as American National Standard. 2 COMPARISON TO ISO STANDARDS There is no inch series ISO standard for these products at this time. 3 TERMINOLOGY For definitions of terms relating to fasteners or component features used in this Standard, refer to ASME B18.12. 4 REFERENCE STANDARDS The following is a list of publications referenced in this Standard. ASME B1.1, Unified Inch Screw Threads ASME B1.3, Screw and Thread Gaging Systems for Dimensional Acceptability — Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME Y14.5M, Dimensioning and Tolerancing Publisher: The American Society Of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2300, Fairfield, NJ 07007-2300 ASTM F 606, Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets ASTM F 812, Specification for Surface Discontinuities of Nuts, Inch Series ASTM F 1941, Electrodeposited Coatings on Threaded Fasteners [Unified Inch Screw Threads (UN/UNR)] ASTM F 2282, Standard Specification for Quality Assurance Requirements for Carbon and Alloy Steel Wire, Rods, and Bars for Mechanical Fasteners
ASTM F 2328, Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws, and Studs Publisher: ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 5 DIMENSIONS (a) Unless otherwise specified, all dimensions in this Standard shall be as specified in Tables 1 and 2, and sections 6 through 9. All dimensions in this Standard are in inches and apply before plating or coating is specified. When a plating or coating is specified, the finished product dimensions shall be agreed upon between the supplier and purchaser. (b) Symbols specifying geometric characteristics are in accordance with ASME Y14.5M. 6 SERRATIONS The configuration of the serrations shall be at the discretion of the manufacturer, provided the perform- ance requirements as specified in para. 12.2 are met. 7 TOPS OF NUTS Tops of nuts shall be flat and chamfered. The length of chamfer at hex corners shall be from 5% to 15% of the basic thread size. The surface may be slightly convex or rounded. 8 TRUE POSITION OF HEXAGON TO TAPPED HOLE At maximum material condition (MMC), the axis of the hexagon shall be located attrue position with respect to the axis ofthe thread pitch diameterwithina tolerance zone having a diameter equivalent to 4% of the maxi- mum width across flats. 9 COUNTERSINK Tapped hole shall be countersunk on the bearing face and may be countersunk on the top.
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement of Need and Background Information. The request should identify the standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the standard to which the proposed Case applies.