ASME B18.31.3-2014 pdf download

ASME B18.31.3-2014 pdf download.Threaded Rods (Inch Series).
1 INTRODUCTION 1.1 Scope This Standard covers the general and dimensional data for inch series threaded rods. Included are the fol- lowing thread configurations and diameters: (a) UNC threads #4 through 4 in. (b) UNF threads #4 through 1 1 ⁄ 2 in. (c) 8UN threads 1 1 ⁄ 8 in. through 4 in. (d) Acme threads 1 ⁄ 4 in. through 5 in. 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 For definitions ofterminology not specifically defined in this Standard, refer to 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 B1.3, Screw Thread Gaging Systems for 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, Quality Assurance for Fasteners Publisher: The American Society of Mechanical Engineers (ASME), Two Park Avenue, New York, NY 10016-5990;OrderDepartment: 22 LawDrive,P.O. Box 2900, Fairfield, NJ 07007-2900 (www.asme.org) ASTM A193/A193M, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High Pressure Service and Other Special Purpose Applications 1 ASTM A307, Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength ASTM A354, Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners ASTM A449, Standard SpecificationforHex Cap Screws, Bolts and Studs, Steel, Heat Treated, 120/105/90 ksi Minimum Tensile Strength, General Use ASTM F468, Standard Specification for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use ASTM F593, Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs ASTM F788/F788M, Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series ASTM F1470, Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection ASTM F1554, Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength ASTM F1941, Standard Specification for Electrodeposited Coatings on Threaded Fasteners (Unified Inch Screw Threads (UN/UNR)) ASTM F2329, Standard Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners Publisher: American Society for Testing and Materials (ASTM International), 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 (www.astm.org) SAE J429, Mechanical and Material Requirements for Externally Threaded Fasteners Publisher: SAE International,400 CommonwealthDrive, Warrendale, PA 15096 (www.sae.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. Class 2A shall be applicable for 8UN threads and at the manufacturer’s option for other series, and for sizes where Class 1A is not applicable. 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. Acme threads shall meet the requirements of ASME B1.5, Class 2G. Table 1 contains the thread diameter and threads per inch combinations for Unified and Acme thread sizes considered standard. 2.3 Thread Acceptance Gaging Unless otherwise specified by the purchaser, gaging for screw thread dimensional acceptability shall be in accordance with Gaging System 21 as specified in ASME B1.3. 2.4 Ends The ends shall be of sufficient workmanship to allow for easy assembly with an appropriate mating nut. 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 The purchaser must specify the applicable specifica- tion for the threaded rod material. The material shall meet the chemical and mechanical properties of the applicable specification. Listed below are some of the primary material specifications for threaded rod. Other materials may be specified by the purchaser.