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ASME B18.2.3.2M-2005 pdf download

ASME B18.2.3.2M-2005 pdf download.Metric Formed Hex Screws.
1 SCOPE (a) This Standard covers the complete dimensional and general data for metric formed hex screws recog- nized as American National Standard. Formed hex screws are cold formed products with fully upset (non-trimmed) heads. Formed hex screws are stan- dard only in sizes M5 thru M24, with lengths up to 150 mm, or 10 times nominal screw size, whichever is shorter. (b) The inclusion of dimensional data in this Stan- dard 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 sup- pliers concerning lists of stock production formed hex screws. 2 COMPARISON WITH ISO STANDARDS (a) Because of numerous differences between this Standard and ISO 4015, a detailed summary is included in Appendix C. (b) At its meeting in Varna, May 1977, ISO/TC2 studied several technical reports analyzing design con- siderations influencing determination of the best series of width across flats for hexagon bolts, screws, and nuts. A primary technical objective was to achieve a logical ratio between underhead (nut) bearing surface area (which determines the magnitude of the com- pressive stress on the bolted members) and the tensile stress area of the screw thread (which governs the clamping force that can be developed by tightening the fastener). Table 1 lists the sizes selected by ISO/TC2 to be ISO standard. M10 screws with 15 mm width across flats are cur- rently being produced and used in the U.S. and many other countries. This size, however, is not an ISO stan- dard. Unless M10 screws with 15 mm width across flats are specifically ordered, M10 screws with 16 mm width across flats shall be furnished. (c) Letter symbols designating dimensional charac- teristics are in accord with those used in ISO standards, except that capital letters have been used instead of the lower case letters used in ISO standards. 3 TERMINOLOGY For definitions of terms relating to fasteners or com- ponent features thereof used in this Standard, refer to American National Standard ASME B18.12. ASME B18.2.3.2M-2005 1 4 REFERENCED STANDARDS The following is a list of publications referenced in this Standard. 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 B18.2.8, Clearance Holes for Bolts, Screws and Studs 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 B18.24.1, Part Identifying Number (PIN) Code System Standard for B18 Fasteners Externally Threaded Products ASME Y 14.5M, 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, Box 2300, Fairfield, NJ 07007-2300 ASTM F 468M, Nonferrous Bolts, Hex Cap Screws and Studs for General Use (Metric) ASTM F 568M, Carbon and Alloy Steel Externally Threaded Fasteners ASTM F 738M, Stainless Steel Metric Bolts, Screws and Studs ASTM F 788/F 788M, Surface Discontinuities of Bolts, Screws, and Studs—Inch and Metric Series Publisher: The American Society for Testing and Mate- rials (ASTM), 100 Barr Harbor Drive, West Con- shohocken, PA 19428-2959. ISO 4015, Hexagon Head Bolts—Product Grade B— Reduced Shank (shank diameter approximately equal to pitch diameter) Publisher: International Organization for Standardiza- tion (ISO), Rue de Varembé, Case Postale 56, CH-1211, Geneve 20, Switzerland. 5 DIMENSIONS (a) All dimensions in this Standard are given in mil- limeters (mm), and apply before coating, unless stated otherwise. (b) Symbols specifying geometric characteristics are in accordance with ASME Y14.5M.

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