ASME B18.31-4M:2009 pdf download

ASME B18.31-4M:2009 pdf download.Threaded Rod (Metric Series)
1 INTRODUCTION
This Standardcovers the complete generaland dimen- sional data for metric series threaded rod recognized as an American National Standard. This Standard is applicable to both fine and coarse metric series threads of diameters from M1.6 to M56, as indicated in Table 1. 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.
8 SCREW THREADS
8.1 Thread Series and Tolerance Class Threads shall be metric coarse or fine thread series tolerance class 6g conforming to the dimensions for gen- eral purpose external threads in ASME B1.13M unless otherwise specified by the purchaser. Thread size limits prior to plating or coating shall be class 6g (GO and NOT GO). After plating or coating, class 6g threads shall be accepted using the size limits of 6g GO (high limit) and 6g NOT GO (low limit). Threads shall be right-hand unless left hand threads are specifically ordered. (See section 18.) 8.2 Thread 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.
9 STRAIGHTNESS
When required, straightness limits and the inspection technique to be used to evaluate straightness shall be as agreed upon between purchaser and supplier.
10 MATERIAL 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, including nonmetallic materials, may be spec- ified by the purchaser. 10.1 Steel Unless otherwise specified, carbon and alloy steel threaded rods shall conform to the alloy and property class requirements in accordance with ASTM F 568M. 10.2 Steel — High Temperature Application Metric threaded rod per ASTM A 193/A 193M may be specified for applications with high temperature and high strength requirements. Grade B7 is the most readily available. 10.3 Corrosion-Resistant Steel Unless otherwise specified, corrosion-resistant steel threaded rods shall conform to the alloy and property class requirements in accordance with ASTM F 738M including passivation in accordance with ASTM A 380.10.4 Nonferrous Materials Unless otherwise specified, nonferrous, metallic threaded rod materials shall conform to the alloy and property class requirements in accordance with ASTM F 468M.
11 FINISH
Unless otherwise specified, threaded rod shall be sup- plied with a natural (as processed) finish, unplated or uncoated, in a clean condition. Steel threaded rod shall becoatedwithalightoiltoprotectfromcorrosionduring transportation and storage. Applicable electrodeposited coatings shall be identified in accordance with ASTMF1941Mandconformto the requirements therein. Hot-Dip zinc coating shall be in accordance with ASTM F 2329. For other coated products, the purchaser shall specify the coating and thickness.
12 WORKMANSHIP
Threaded rods shall be visually, without magnifica- tion, free from burrs, seams, laps, loose scales, irregular surfaces, and any defects affecting their serviceability. When control of surface discontinuities is required, the purchaser shall specify conformance to ASTM F 788/ F 788M for products with nominal diameters of 4 mm and largerand withspecified minimumtensile strengths of 800 MPa and greater.
13 ALLOY AND PROPERTY CLASS SYMBOL AND MANUFACTURER’S MARKING
Unlessotherwise specifiedbythe purchaser, themark- ing requirements specified in the material specification are optional for threaded rod at the discretion of the manufacturer. Packaging and label requirements as mandated in applicable material specifications are required.