ASTM A453/A453M Grade 660 Class B Bolting Specification
ASTM A453 Grade 660 Class B specification provides a yield strength viz. 85 ksi [585 MPa] respectively for use in high temperature service for bolting components such as Stud bolts, screws, nuts, hex bolts & various other fasteners for pressure vessel and valve flanges. A453 Grade 660 Class B is equivalent to EN 10269 1.4980 and ASTM A638 Type 2 . A453 Grade 660 Cl B Studs and nuts are capable of meeting impact test requirements of 40 joules minimum at - 100 Degrees Centigrade. ASTM A453 Grade 660 Class B is produced in various other forms like wire rods, round bars, shafts, castings, forgings, threaded bars, threaded rods, wires, tubings, sheets, plates, welding rods, hex bars, Rivets & Springs. Class B Fasteners are stress rupture tested for 100 Hours at 650°C in finished condition. Class B Bolting can be certified under nace provided the hardness is controlled and not over 35HRC.
Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.
Threads may be formed by machining or rolling. Threads may be formed after precipitation heat treatment or after solution anneal but prior to precipitation heat treatment. Type designations are as follows:
- Type M1 -Threads formed by machining after precipitation heat treatment.
- Type M2 - Threads formed by machining after solution anneal but prior to precipitation heat treatment.
- Type R1 - Threads formed by rolling after precipitation heat treatment.
- Type R2 - Threads formed by rolling after solution anneal but prior to precipitation heat treatment.
When not specified by the purchaser, the type supplied shall be the option of the manufacturer.
B18.31.2 Imperial Continious Thread, Double End Reduced & Full Body Studsh
B18.31.1M Metric Continious Thread, Double End Reduced & Full Body Studs
B18.31.3 Threaded Rods (Inch Series)
B16.5 Imperial Full Thread Stud Bolts
B16.5 Metric Full Thread Stud Bolts
B22.214.171.124M Metric Hex Cap Screws
B126.96.36.199M Metric Heavy Hex Screws
B188.8.131.52M Metric Hex Bolts
B18.3 Imperial Hexagon Socket and Spline Socket Screws
B18.3.1M Metric Socket Head Cap Screws
B18.6.7M Metric Machine Screws
- EN 10204 3.1
- EN 10204 3.2
- PED 2014/68/EC
- MERKBLATT AD 2000 W2/W7/W10
- API 20 E BSL 1/ BSL 2
- NACE MR 0175
- NACE MR 0103
E139 Test Methods for Conducting Creep, Creep-Rupture,and Stress-Rupture Tests of Metallic Materials
E292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.3 Screw Thread Gaging System for Dimensional Acceptability - Inch Screw Threads (IN, UNR, and UNJ)
ASME B1.13M Metric Screw Threads- M Profile
ASME B1.21M Metric Screw Threads - MJ Profile
ASME B1.2 Gauges & gauging for Unified Screw Threads(Imperial)