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ASME B18.16M-2004 pdf download

ASME B18.16M-2004 pdf download.Prevailing- Torque Type Steel Metric Hex Nuts and Hex Flange Nuts.
1 SCOPE This Standard covers the complete general, dimen- sional, mechanical, and performance data for metric prevailing-torque hex nuts and hex flange nuts of prop- erty classes 5, 9, and 10 as defined in ASTM A563M. The inclusion of dimensional data in this Standard is not intended to imply that all of the nut sizes in con- junction with the various options described herein are stock items. Consumers should consult with suppliers concerning lists of stock production prevailing-torque hex and hex flange nuts. 2 COMPARISON WITH ISO STANDARDS 2.1 Coordination With ISO Standards Hex and hex flange nuts as covered in this Standard have been coordinated to the extent possible with ISO 2320, ISO 7040, ISO 7041, ISO 7042, ISO 7043, ISO 7044, ISO 7719, and ISO 7720. The dimensional differences are few, except those of the M10 size. None affect the func- tional interchangeability of nuts manufactured to the re- quirements of either. The clamp torque values in Table 4 of this Standard are significantly different compared to the applied torques in ISO 2320 Annex C. ISO 2320 does not make any coating distinctions. 2.2 Letter Symbols Letter symbols designating dimensional characteris- tics are in accord with those used in ISO standards, ex- cept that capitals have been used instead of lower case letters used in ISO standards. 2.3 ISO Width Across Flats M10 hex and hex flange nuts with 15 mm width across flats are currently being produced and used in the U.S. and many other countries. This width across flats is not ISO standard for hex nuts, but is ISO standard for hex flange nuts. The ISO standard for M10 hex nuts speci- fies 16 mm width across flats. Unless M10 hex nuts with 15 mm width across flats are specifically ordered, M10 hex nuts with 16 mm width across flats shall be fur- nished. ASME B18.16M-2004 1 3 REFERENCE STANDARDS The following is a list of publications referenced in this Standard. Unless otherwise specified, the reference standard(s) shall be the most recent issue at the time of order placement. ASME B1.3M, Screw Thread Gaging Systems for Di- mensional Acceptability—Inch and Metric Screw Threads (UN, UNR, UNJ, M and MJ) ASME B1.13M, Metric Screw Threads—M Profile ASME B18.2.3.1M, Metric Hex Cap Screws ASME B18.12, Glossary of Terms for Mechanical Fas- teners ASME B18.18.1, Inspection and Quality Assurance for General Purpose Fasteners ASME B18.18.2, Inspection and Quality Assurance for High Volume Machine Assembly Fasteners ASME B18.24, Part Identifying Number (PIN) Code Sys- tem Standard for B18 Fastener Products ASME Y14.5M, Dimensioning and Tolerancing Publisher: The American Society of Mechanical Engi- neers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900 ASTM A563M, Carbon and Alloy Steel Nuts (Metric) ASTM B487, Test Method for Measurement of Metal and Oxide Coating Thicknesses by Microscopical Exami- nation of a Cross Section ASTM F467M, Nonferrous Nuts for General Use [Metric] ASTM F586M, Carbon and Alloy Steel Externally Threaded Metric Fasteners ASTM F812/F812M, Surface Discontinuities of Nuts ASTM F836M. Style 1 Stainless Steel Metric Nuts ASTM F1137, Phosphate/Oil and Phosphate/Organic Corrosion Protective Coatings for Fasteners Publisher: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 ISO 2320, Prevailing torque type steel hexagon nuts — Mechanical and performance properties ISO 7040, Prevailing torque type hexagon nuts (with non-metallic insert), style 1 —Property classes 5, 8 and 10 ISO 7041, Prevailing torque type nuts (with non-metal- lic insert), style 2— Property classes 9 and 12
7 WIDTH ACROSS FLATS The width across flats shall be the distance, measured perpendicular to the axis of the nut, between two op- posite wrenching flats. The maximum width across flats may be exceeded by 0.05 mm to allow for nut defor- mation caused by introduction of the prevailing-torque feature. The width across flats and width across corners may be less than the specified minimum in the deformed portion of the nut containing the prevailing-torque fea- ture. At maximum material condition the axis of the hexa- gon shall be located at true position with respect to the axis of the thread pitch diameter within a tolerance zone having a diameter equivalent to 4% of the maximum width across flats. 8 THICKNESS The nut thickness shall be the overall distance, meas- ured parallel to the axis of the nut, from the top of the nut to the bearing surface of hex nuts, and to the plane of the bearing circle diameter of hex flange nuts. Raised identification markings, if present, shall be excluded. 9 WRENCHING HEIGHT The wrenching height is the distance, measured at a corner of the hex, from the bearing surface of hex nuts, and from the junction of the hex portion with the flange of hex flange nuts to the last plane of full formed hex, i.e., the plane perpendicular to the nut axis that is clos- est to the top of the nut and at which the width across corners is within its specified limits. Wrenching height for hex nuts is dimension M 1 in Table 1, and is subject to measurement. Wrenching height for hex flange nuts is dimension T a in Table 2 and is controlled by the gag- ing requirement specified in para. 10.

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