ASTM A453 Grade 660 Class A Bolts, A286, Square, Hex Bolts, Hex Cap Screws, Lag Screws, Hex Socket and Spline Socket Screws, Studs, Stud Bolts, Threaded Rod, DIN 2510/939/940, ASME B18.2.1, B18.3, B1.1 Inch Unified Threads
ASTM A453 Grade 660 Class A bolts are Iron Based Super Alloy bolts manufactured from iron-nickel-chromium alloy with additions of molybdenum and titanium. A453 660 Class A Bolts maintain good strength and oxidation resistance at temperatures up to 1300ºF. Torqbolt is a prominent A453 gr 660 Class A bolt supplier in India.
A286 Stainless Steel
Precipitation Hardening Steel
Solution Annealed and Precipitation Hardened
– Finish: Pickling and Passivation
– Marking: TorqBolt | BEA 660A
– Type: Cold Forged, Hot Forged, Bar Stock Machined
|Dimensions||ASME B18.2.1, B18.3|
|Threads||Unless otherwise specified, the threads shall be rolled or cut at the option of TorqBolt|
|Threads Configuration||ASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads|
|Melt Origin||East Europe/South America/Korea/Japan|
|Product Origin||Made in India|
|Certification||Dual Certified As per ASTM & ASME Codes|
|Additional Certifications||PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified|
|Additional Requirements||NACE MR0103/MR0175/ISO 15156 Compliance|
|Mandatory Requirements||Free from Mercury & Radioactive Contamination|
ASTM A453 660 Class A Bolts Specification
ASTM A453 Grade 660 Class A Bolts, Screws, Nuts and Studs contain 24% Nickel and 13.5% Chromium with addition of 1.80 up to 2.10 percentage of Titanium to add toughness for use at high temperatures. The Co-efficient of expansion of A453 gr 660A bolts is comparable to austenite stainless steels. A453 660 Cl A is the most common grade used in conjunction with Grades B,C & D. A453 Grade 660 Class A Boltings are heated up to 900 degrees Celsius with a holding time of 2 hours followed by liquid quenching and age hardened once to achieve the desired tensile stress & yield strength. Unlike Gr 660 Class d Bolts, Class A Bolts require stress-rupture test at 650 degrees Celsius with a minimum stress of 385 Mpa for at least 100 hours. The maximum permissible hardness for 660 A Bolting is 37 HRC.
Finishing Process for ASTM A453 Gr 660A Stud Bolts, Bolts, Screws Threads for studs, screws and bolts made of A453 Gr 660A can be formed by machining or rolling from Pitch Diameter. Keeping the heat treatment condition of A453 Grade 660A, Threads may be formed after precipitation hardening or after solution annealing but prior to precipitation age hardening.The following Type designations of A453 660A Studs & Bolts are as follows:
- Type M1threads formed by machining after Precipitation Hardening.
- Type M2threads formed by machining after solution annealing but prior to precipitation hardening.
- Type R1threads formed by rolling after precipitation hardening.
- Type R2threads formed by rolling after solution annealing but prior to precipitation hardening.