ASME B18.31.3:2014 pdf download Threaded Rods (Inch Series)
2.2 Threads
Unified threads shall conform to the requirements ofASME B1.1.For UNC and UNF threads, Class 1A willbe furnished unless otherwise specified. Class 2A shallbe applicable for 8UN threads and at the manufacturer’soption for other series, and for sizes where Class 1A isnot applicable. Plated threads shall conform toASME B1.1,Class 3A high limit (basic) and the low limitrequirement of the before-coated or plated thread class.Acme threads shall meet the requirements ofASME B1.5,Class 2G.
Table 1 contains the thread diameter and threads perinch combinations for Unified and Acme thread sizesconsidered standard.
2.3 Thread Acceptance Gaging
Unless otherwise specified by the purchaser, gagingfor screw thread dimensional acceptability shall be inaccordance with Gaging System 21 as specified inASME B1.3.
2.4 Ends
The ends shall be of sufficient workmanship to allowfor easy assembly with an appropriate mating nut.2.5 Straightness
When required, straightness limits and the inspectiontechnique to be used to evaluate straightness shall beagreed 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 shallmeet the chemical and mechanical properties of theapplicable specification. Listed below are some of theprimary material specifications for threaded rod.Othermaterials may be specified by the purchaser.
2.6.1 Steel Threaded Rod
2.6.1.1 Steel. The designation “steel” means low-carbon steel meeting all of the material and mechanicalrequirements of ASTM A307 ,Grade A.
2.6.1.2 Grade 36.The designation”Grade 36″means steel material meeting all of the material and mechanical requirements of ASTM F1554,Grade 36.NOTE:A designation of“A36″or “ASTM A36” refers to rawmaterial only and is inappropriate as a fastener reference. Thepurchaser shall use the designation “ASTM A307A” orASTM F1554, Grade 36 as required.
2.6.1.3 B7.The designation“B7″ means a chro-mium molybdenum steel meeting all of the materialand mechanical requirements of ASTM A193,Grade B7.Other grades of steel for high-temperature applicationsmay be ordered to other grades in ASTM A193/A193M.
2.6.1.4 Other Acceptable Steel Materials forThreaded Rod
(a) Low strength: SAE J429,Grades 1 and 2
(b)Medium strength: ASTM A449，Type 1;ASTM F1554,Grade 105
(c) High strength: ASTM A354,Grades BC and BD;SAE J429,Grade 8
2.6.2 Stainless Steel Threaded Rod
2.6.2.1 Stainless Steel (or ssT). The designation“stainless steel”or “SST” means material meeting all ofthe material and mechanical requirements ofASTM F593,Alloy Group 1, Condition Cw.
2.6.2.2 316 Stainless Steel (or 316). The designa-tion “316 stainless steel”or “316” means material meet-ing all of the material and mechanical requirements ofASTM F593,Alloy Group 2,Condition Cw.
2.6.2.3 Other Stainless Steels.Specific alloys ofstainless steel threaded rod may be ordered by listingthe specific alloy and condition per ASTM F593.
2.6.3 Nonferrous Threaded Rod
2.6.3.1 Brass.The designation “brass” meansmaterial meeting all of the material and mechanicalrequirements for any brass or naval brass of ASTM F468at the supplier’s option.
2.6.3.2 Aluminum.The designation “aluminum”means material meeting all of the material and mechani-cal requirements of any aluminum in ASTM F468 at thesupplier’s option.
2.6.3.3 Other Nonferrous Materials. Other nonfer- rous materials can be ordered by identifying the specific ASTM F468 alloy.
2.6.4 Other Materials and Finishes. Threaded rod of materials and finishes to specifications not identified herein shall be as agreed to between the purchaser and supplier.
2.7 Finishes The purchaser shall designate the required finish. Unless otherwise specified, plain finish steel rods shall be coated with a light oil to protect them from corrosion during transportation and storage. Electroplated rodsshallbe finished inaccordance with ASTM F1941. Hot-dip zinc coating shall be in accordance with ASTM F2329.
2.8 Workmanship Threaded rods shall be visually inspected, without magnification, to be free of burrs, seams, laps, loose scales, irregularsurfaces, and anydefects thataffecttheir serviceability. When control of surface discontinuities is required, the purchaser may specify the surface disconti- nuities shall conform to ASTM F788/F788M or specifi- cally identified purchaser requirements.
2.9 Designation
2.9.1 Threaded rods shall be designated by data in the following sequential order: (a) product name (b) designation of standard (c) nominalsize (fractionalordecimalequivalent) and threads per inch
ASME B18.31.3:2014 pdf download
