ASME B18.31.2-2014 pdf download

ASME B18.31.2-2014 pdf download.Continuous Thread Stud, Double-End Stud, and Flange Bolting Stud (StudBolt) (Inch Series).
(1) For double-end studs, full threads are required for the lengths B and BM, except for the ends, as denoted by dimension, U, in Tables 2 and 3.
(c.) The transition from full thread to incomplete thread shall be smooth and uniform. The major diameter for incomplete threads shall not exceed the actual diameter of the complete (full form) threads.
(d,) For the nut ends of studs, the transition from full thread to no thread shall he within five thread pitches from the minimum full thread length, B.
10 SCREW THREADS
10.1 UNC, UNF, and 8UN Thread Series and Tolerance Class
Threads shall be unified inch coarse, fine, or 8-thread series Class 2A in accordance with ASME BL1. Unless otherwise specified by the purchaser, coated and plated threads shall conform to the maximum limit of Class 3A (GO) and the minimum limit of Class 2A (NOT GO).
10.2 Class S Interference-Fit Threads (for Tap-End Studs)
In addition to the threads identified in para. 10.1, interference-fit threads may he ordered for the tap end of tap-end type studs. These threads shall he interference fit (Class 5) of the modified National thread form in the coarse thread series (NC) in sizes 0.250 in. through 1.500 in. in accordance with ASME BLI2.
NOTE: To achieve the desired performance from an NC-5 thread, the indication of the proper suffix indicating the size of the major diameter is critical. The designation of an NC-5 thread is not complete without the inclusion of the suffix. To seled the appropriate suffix for a specific application, the user should consult Appendices B and C in ASME BIJ2. Additional information on NC-5 thread applications is available in SAE J2271.
10.3 Thread Gaging
Unless otherwise specified, dimensional acceptability of screw threads shall be determined based on System 21. of ASME B1.3.
11 MATERIALS AND MECHANICAL PROPERTIES
11.1 Materials for Continuous Thread Studs, Double-End Studs, and Clamping Studs
Unless otherwise specified, steel studs shall conform to the requirements of ASTM A354, SAE J429, or ASTM A449, as identified by the purchaser.
Unless otherwise specified, studs of corrosion resistant stainless steels shall conform to the requirements of a specified group and condition designated in ASTM F593.
16 INSPECTION AND QUALITY ASSURANCE
Studs shall he inspected to determine conformance with this Standard. Inspection procedures may he specified by the purchaser on the inquiry, purchase order, or the engineering drawings, or shall he as agreed upon between the purchaser and supplier prior to acceptance of the order. In the absence of a defined agreement, the requirements of ASME B18.18 shall apply.
17 CLEARANCE HOLES
The recommended sizes of clearance holes in material to be assembled using inch studs are those listed in ASME B18.2.8 for inch fasteners.
18 STUD DESIGNATION
(a) Description: Studs shall be designated by the following data, preferably in the sequence shown:
(1) product name
(2) product standard (ASME B18.31.2)
(‘3) nominal diameter and thread pitch for Class 2A screw threads
(‘4) nominal diameter, thread pitch, and major diameter thread suffix from ASME BI.12 (including Appendices B and C) for NC—5 interference threads, when specified
(‘5,) nominal length
(6) material (applicable standard and grade or alloy)
(7,) 1,rotbe coating, if required
For tap-end studs, show tap-end thread type from ASME B1.12, length, and nut-end thread, as shown in Example (3) below.
EXAMPLES:
(1) Continuous thread stud, ASME B1&31.2, -13 x 4, SAE J429 Grade 5, zinc plated per ASTM F1941 Classification Code Fe/Zn 5A
(2) Clamping type stud, reduced-diameter body, ASME B18.31.2, %-16 x 2, ASTM F468 nickel-copper alloy 400
(3) Tap-end slud, full body, ASME B18.31.2, 1’/g NC-5 HFSX 6’/2 x 1 ‘4-8UN, ASTM F593 Alloy Group 2, Cold Worked Condition
(4) Continuous thread flange bolting stud, ASME B18.31.2, /4-10 UNCx 6, ASTM A193, Grade B7
(‘b,) Part Identification Number (PIN): Refer to SAE J227l PIN for all stud types covered in this Standard except flange bolting studs (stud bolts).
NOTE: SAF J2271 contains part identification numbers for interference-fit tap-end studs with eight different suffixes for tap-end thread major diameters and guidance on selecting the appropriate thread configurations for both the tap-end and internal thread for the material into which the interference-fit stud is installed.