ASME B18.2.3.3M-2007 pdf download

ASME B18.2.3.3M-2007 pdf download.Metric Heavy Hex Screws.
1 INTRODUCTORY NOTES ASME B1 8.2.8, Clearance Holes for Bolts, Screws, and 1.1 Scope Studs ASME B1 8.1 2, Glossary of Terms for Mechanical 1.1.1 This Standard covers the complete general Fasteners and dimensional data for metric heavy hex screws recog- nized as American National Standard. 1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all of the sizes in conjunction with the various options described herein are stock items. Consumers should consult with suppli- ers concerning lists of stock production sizes. 1.2 Comparison With ISO Standards 1.2.1 ISO has not yet initiated development of an ISO standard for heavy hex screws. However, nominal diameters and thread pitches, body diameters, widths across flats, bearing surface diameters, head heights, thread lengths, thread dimensions, and nominal lengths are in accord with ISO standards for related hex head screws and bolts. 1.2.2 Letter symbols designating dimensional characteristics are in accord with those used in ISO stan- dards, except capital letters have been used instead of the lowercase letters used in ISO standards. 1.3 Terminology ASME B1 8.1 8.1 , Inspection and Quality Assurance for General Purpose Fasteners ASME B1 8.1 8.2, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME B1 8.24, Part Identifying Number (PIN) Code System Standard for B1 8 Fastener Products ASME Y1 4.5M, Dimensioning and Tolerancing Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 1 001 6-5990; Order Department, 22 Law Drive, P.O. Box 2300, Fairfield, NJ 07007-2300 ASTM F 468M, Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use (Metric) ASTM F 568M, Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners ASTM F 738M, Specification for Stainless Steel Metric Bolts, Screws, and Studs ASTM F 1 941 M, Electrodeposited Coatings on Threaded Fasteners (Metric) Publisher: ASTM International (ASTM), 1 00 Barr Harbor Drive, West Conshohocken, PA 1 9428 For definitions of terms relating to fasteners or compo- 2 GENERAL DATA nent features thereof used in this Standard, refer to ASME B1 8.1 2. 1.4 Dimensions 1.4.1 All dimensions in this Standard are in milli- meters, unless stated otherwise. 1.4.2 Symbols specifying geometric characteristics are in accord with ASME Y1 4.5M. 1.5 Referenced Standards The following is a list of publications referenced in this Standard. Unless otherwise specified, the standard(s) referenced shall be the most recent issue at the time of order placement. ASME B1 .3M, Screw Thread Gaging Systems for Dimensional Acceptability — Inch and Metric Screw Threads ASME B1 .1 3M, Metric Screw Threads — M Profile 1 2.1 Heads 2.1.1 Top of Head. The top of head shall be full form and chamfered or rounded. The diameter of the chamfer circle or the start of rounding shall be equal to the maximum width across flats within a tolerance of − 1 5%. 2.1.2 Head Height. The head height is the distance, as measured parallel to the axis of the screw, from the top of the head to the plane of the bearing surface. 2.1.3 Wrenching Height. The wrenching height is the distance, measured at a corner of the hex, from the plane of the bearing surface to the last plane of full formed hex, i.e., the plane closest to the top of head at which the width across corners of the hex is within its specified limits. 2.1.4 Corner Fill. The rounding due to lack of fill at the six corners of the head shall be reasonably uniform.
2.8.2 Thread Gaging. Unless otherwise specified, dimensional acceptability of screw threads shall be based on System 21 of ASME B1.3M. 2.9 Material and Mechanical Properties 2.9.1 Carbon and Alloy Steel. Materials and prop- erty class shall conform to ASTM F 568M. 2.9.2 Corrosion-Resistant Steels. Unless otherwise specified, corrosion-resistant screws shall conform to the requirements of ASTM F 738M. 2.9.3 Nonferrous Metals. Unless otherwise speci- fied, nonferrous screws shall conform to the require- ments of ASTM F 468M. 2. 10 Identification Symbols Identification marking symbols shall be on top of the screw heads and shall be raised or indented at the manu- facturer’s option, unless otherwise specified at the time of order. Markings shall be legible to the unaided eye with the exception of corrective lens. Minimum height of property class symbols shall be 3.2 mm for M12 and M14 screws, and 4.0 mm for M16 and larger screws. When raised, markings shall project not less than 0.1 mm for M12 and M14 screws, and 0.3 mm for M16 and larger screws above the surface of the head. Total head height (head plus markings) shall not exceed the specified max- imum head height plus 0.3 mm for M12 and M14 screws, and 0.4 mm for M16 and larger screws.