ASME B18.31.3-2009 pdf download.Threaded Rods (Inch Series).
1 INTRODUCTION 1.1 Scope This Standardcovers the complete generaland dimen- sional data for inch series threaded rods recognized as American National Standard. Included are diameters #4 through 4 in. UNC, UNF, 8UN, and ACME in both right- and left-handed threads. At this time, there are no ISO standards for inch threaded rods. The inclusion of dimensional data in this Standard is not intended to imply that all of the products described herein are stock production sizes. Consumers should consult with suppliers concerning lists of stock produc- tion sizes. 1.2 Dimensions All dimensions in this Standard are in inches, unless otherwise specified. 1.3 Terminology All terms used in this Standard are defined in ASME B18.12. 1.4 Referenced Standards Unless otherwise specified, the standards referenced shall be the most recent at the time of order placement. ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form) ASME B1.3M, Screw Thread Gaging Systems for Dimensional Acceptability — Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B1.5, Acme Screw Threads ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.2, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME B18.24, Part Identifying Number (PIN) Code System Standard for B18 Fastener Products Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 (www.asme.org) ASTM A 193/A 193M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High Pressure Service and Other Special Purpose Applications
ASTM A 307, Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength ASTM A 380, Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems ASTM F 468, Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use ASTM F 593, Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs ASTM F 788/F 788M, Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series ASTM F 1470, Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection ASTM F 1554, Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength ASTM F 1941, Electrodeposited Coatings on Threaded Fasteners (Unified Inch Screw Threads (UN/UNR)) Publisher: American Society for Testing and Materials (ASTM International), 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428 (www.astm.org) 2 GENERAL DATA 2.1 Length Threaded rods are commonly produced in, but not limited to, 3-ft, 6-ft, 10-ft, and 12-ft lengths. The length of the threaded rod shall be measured, overall, from end to end. The length tolerance on all threaded rods in nominal lengths of 6 ft and longer shall be ± 1 ⁄ 2 in. and ± 1 ⁄ 4 in. for nominal lengths less than 6 ft. See Fig. 1. 2.2 Threads Unified threads shall conform to the requirements of ASME B1.1. For UNC and UNF threads, Class 1A will be furnished unless otherwise specified. Plated threads shall conform to ASME B1.1, Class 3A high limit (basic) and the low limit requirement of the before-coated or plated thread class. Class 2A threads shall be used on 8 UN threads and at the manufacturer’s option for other series, and for sizes where 1A is not applicable.
2.5 Straightness When required, straightness limits and the inspection technique to be used to evaluate straightness shall be agreed upon between the purchaser and the supplier. 2.6 Materials and Mechanical Requirements There are four primary designations for threaded rod materials. Other materials may be specified by the purchaser. 2.6.1 Steel. Unless otherwise specified, Steel shall designate low carbon steel meeting the minimum requirements of ASTM A 307, Grade A. 2.6.2 A36. Materials shall meet the requirements of ASTM F 1554, Grade 36. 2.6.3 B7. B7 shall designate the material and mechanical properties of ASTM A 193/A 193M, Grade B7. 2.6.4 CRES. Unless otherwise specified, CRES shall designate corrosion resistant steel of either 18-8 (302, 303, or 304) or 316 as designated by the purchaser. Rods designated as 18-8 shall meet the tensile and yield strength requirements of Alloy Group 1, condition CW per ASTM F 593. Rods designated as 316 shall meet the tensileandyield strengthrequirements ofAlloyGroup 2, condition CW per ASTM F 593. 2.6.5 Nonferrous Materials. Nonferrous materials shall conform to ASTM F 468.