ASME B18.2.3.2:2005 pdf free download Metric Formed Hex Screws
sCOPE
(a) This Standard covers the complete dimensionaland general data for metric formed hex screws recog-nized as American National Standard. Formed hexscrews 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 to150 mm, or 10 times nominal screw size, whichever isshorter.
(b) The inclusion of dimensional data in this Stan-dard is not intended to imply that all of the sizes inconjunction with the various options described hereinare stock items. Consumers should consult with sup-pliers concerning lists of stock production formed hexscrews.
2COMPARISON WITH ISO STANDARDS
(a) Because of numerous differences between thisStandard and ISO 4015, a detailed summary is includedin Appendix C.
(b) At its meeting in Varna,May 1977,ISO/ TC2studied several technical reports analyzing design con-siderations influencing determination of the best seriesof width across flats for hexagon bolts，screws,andnuts. A primary technical objective was to achieve alogical ratio between underhead (nut) bearing surfacearea (which determines the magnitude of the com-pressive stress on the bolted members) and the tensilestress area of the screw thread (which governs theclamping force that can be developed by tightening thefastener). Table 1 lists the sizes selected by So/TC2 tobe ISO standard.
M10 screws with 15 mm width across flats are cur-rently being produced and used in the U.S. and manyother countries.This size, however, is not an ISO stan-dard.Unless M10 screws with 15 mm width across flatsare specifically ordered, M10 screws with 16 mm widthacross 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 thelower case letters used in ISO standards.
3TERMINOLOGY
For definitions of terms relating to fasteners or com-ponent features thereof used in this Standard, refer toAmerican National Standard ASME B18.12.
4REFERENCED STANDARDS
The following is a list of publications referenced inthis Standard.
ASME B1.3M,Screw Thread Gaging Systems for Di-mensional Acceptability – Inch and Metric ScrewThreads (UN,UNR,UNJ, M, and MJ)
ASME B1.13M, Metric Screw Threads —M ProfileASME B18.2.8,Clearance Holes for Bolts,Screws andStuds
ASME B18.12，Glossary of Terms for Mechanical Fas-teners
ASME B18.18.1,Inspection and Quality Assurance forGeneral Purpose Fasteners
ASME B18.18.2,Inspection and Quality Assurance forHigh Volume Machine Assembly Fasteners
ASME B18.24.1,Part Identifying Number (PIN) CodeSystem Standard for B18~FastenersExternallyThreaded Products
ASME Y 14.5M,Dimensioning and Tolerancing
Publisher:The American Society of Mechanical Engi-neers (ASME).Three Park Avenue,New York,NY10016-5990; Order Department: 22 Law Drive,Box2300,Fairfield,NJ 07007-2300
ASTM F 468M,Nonferrous Bolts,Hex Cap Screws andStuds for General Use (Metric)
ASTM F 568M,Carbon and Alloy Steel ExternallyThreaded Fasteners
ASTM F738M,Stainless Steel Metric Bolts,Screws andStuds
ASTM F 788/F788M,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,
ISO4015,Hexagon Head Bolts – Product Grade B-Reduced Shank (shank diameter approximately equalto pitch diameter)
Publisher: International Organization for Standardiza-tion (ISO), Rue de Varembe, Case Postale 56,CH-1211,Geneve 20,Switzerland.
5DIMENSIONS
(a) All dimensions in this Standard are given in mil-limeters (mm), and apply before coating, unless statedotherwise.
(b) Symbols specifying geometric characteristics arein accordance with ASME Y14.5M.
ASME B18.2.3.2:2005 pdf free download
