ASME B18.31.4M-2009 pdf free download.Threaded Rod (Metric Series).
8 SCREW ThREADS
8.1 Thread Series and Tolerance Class
Threads shall bc metric coarse or fine thread series tolerance class 6g conforming to the dimensions for gen— eral purpose external threads in ASt%4E BI.13M unless otherwise specified by thc purchaser. Thread size limits prior to pLating oi coating shall be class 6g (GO and N(Y1 GO). Alter plating or coating. cIars LSg threads shall be accepted using the size limits of tij 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 dinwnsivnal acceptability shall be in accordance with Gaging System 21 as specified in ASidE B1.3.
9 STRAIGHTNESS
When required, straightness limits and the inspection technique In be used to evaluate straightness shall be as agreed upon between purchaser and supplier.
10 MATERIAL AND MECHANICAL REQUIREMENTS
11w purchaser must specify the applicable specifIcaban 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 thwaded rod. Other materials, including nonmetallic materials, may be spec. ified by the purthaser.
10.1 Steel
Unless otherwise specified, carbon and alloy steel threaded rods shall conform to the allay and property class rvquiwments in accordance with ASTM F 5êSM.
10.2 Steel — High Temperature ApplIcation
Metric threaded rod per ASTM A 193/A 193M may be specified for applications with hig)i temperature and high strength requirements. Grade 137 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 AS1M F 735M including passivation in accordance with ASIM A 380.
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 general 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 (Ilow limit). Threads shall be right-hand unless left hand threads are specifcally 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 B13.
9 STRAIGHTNESS
When required, straightness limits and the inspectio technique to be used to evaluate straightness shall be as agreed upon between purchaser and supplier.