ASTM A453 Grade 660 Stud bolt Manufacturer
High-Temperature Stud Bolts | Alloy A-286 (UNS S66286) Fasteners
As a professional ASTM A453 Grade 660 stud bolt manufacturer, we specialize in producing high-strength, precipitation-hardened stud bolts for extreme temperature and pressure applications. Grade 660 stud bolts are engineered to deliver excellent creep resistance, stress rupture strength, and long-term stability in critical bolted joints.
Our ASTM A453 Grade 660 stud bolts are widely supplied to power plants, refineries, petrochemical facilities, gas turbines, and pressure vessel projects worldwide.
ASTM A453 Grade 660 is a high-temperature bolting material with properties suitable for service in high-temperature environments. Specifically, Grade 660 refers to a precipitation-hardening stainless steel alloy that is commonly known as “A286” or “Alloy 660.”
ASTM A453 Grade 660 stud bolts are specific types of fasteners made from the precipitation-hardening stainless steel alloy known as Alloy 660 or A286, which conforms to the
ASTM A453 Grade 660 specification.
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Standard Specification for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
This specification covers standards for Grade 660 (Class A, B, C, and D) , Grade 651 (Class A and B), Grade 662 (Class A and B), and Grade 665 (Class A and B) of bolting materials for use in high-temperature service such as fasteners, for pressure vessels and valve flanges. Bolting materials in this specification covers rolled, forged, or hot-extruded bars, and also bolts, nuts, screws, washers, studs, and stud bolts.
ASTM A453 Grade 660 Stud bolt Manufacturing Process
Finishing Process: 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.
A453 Grade 660 Stud bolt Material Equivalent
| AISI | UNS | BS | Wr No. | En Name | DIN EN | JIS | AMS | ASTM | other names | Additional Requirements |
|---|---|---|---|---|---|---|---|---|---|---|
| 660 | S 66286 | HR 51 | 1.4944 | X6NiCrTiMoV26-15 | 10269 | SUS 660 | 5726 | ASTM A453 GRADE 660A | incoloy a286 | NACE MR-0175 |
Chemical Composition of A453 Gr 660 Stud Bolts
| Element | Grade 660 |
|---|---|
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Phosphorus, max | 0.040 max |
| Sulfur, max | 0.030 max |
| Silicon | 1.00 max |
| Nickel | 24.0-27.0 |
| Chromium | 13.5-16.0 |
| Molybdenum | 1.00-1.50 |
| Tungsten | … |
| Titanium | 1.9-2.35 |
| Columbium * | … |
| Aluminum | 0.35 max |
| Vanadium | 0.10-0.50 |
| Boron | 0.001-0.010 |
| Copper | – |
ASTM A453 Gr 660 Stus bolt Strength Chart
| Grade | Class | Tensile Strength | Yield Strength | Elongation in 4D, min, % |
Reduction of Area, min, % |
Brinell Hardness Number |
Approximate Rockwell Hardness, B & C |
|||
|---|---|---|---|---|---|---|---|---|---|---|
| Ksi | Mpa | Ksi | Mpa | min | max | |||||
| Grade 660 | A, B and C | 130 | 895 | 85 | 585 | 15 | 18 | 248-341 | 24 HRC | 37 HRC |
| Grade 660 | D | 130 | 895 | 105 | 725 | 15 | 18 | 248-341 | 24 HRC | 35 HRC |
| Grade | Class A | Class B | Class C | Class D |
|---|---|---|---|---|
| Grade 660 Bolts | 660A | 660B | 660C | 660D NR |
ASTM A453 Grade 660 Stud bolts Stress-Rupture Test
Requirements—Bolting material shall conform to the stress-rupture requirements prescribed in Table 6 for design temperatures above 800 °F [427 °C]. Bolting material not stress-rupture testeds hall be permanently stamped NR. Grade 660 Class D and Grade 668 do not require stress – rupture and shall bes tamped NR.
Our ASTM A453 Grade 660 Cl D Stud bolts and nuts can meet impact test requirements of 70 joules minimum at – 196 Degrees Centigrade and comply with NACE MR 0175 requirement.
ASTM A453 Grade 660 Cl D Stud bolts Product Marking
Bolts, Nuts, Screws, and Studs—In addition to the requirements of Specification A962/A962M, the grade symbol and class shown in Table 4 and the type designation (see 6.1.1) shall also appear on all bolting components so processed. Grade 660 Class D and Grade 668 shall be stamped NR in addition to other required markings.
As a trusted ASTM A453 Grade 660 stud bolt manufacturer, we supply high-performance stud bolts engineered for extreme temperature and pressure service. With excellent creep resistance, oxidation stability, and full ASTM compliance, Grade 660 stud bolts are the preferred solution for power plants, turbines, and critical industrial systems.
