ASTM A453 Grade 660 High Temperature Stud Bolt with Hex Nuts
ASTM A453 Grade 660 stud bolts are precipitation-hardened austenitic stainless steel fasteners manufactured from UNS S66286 / Alloy A286 material for high-temperature and high-pressure bolting applications. These high strength stud bolts provide excellent creep resistance, oxidation resistance and mechanical stability at temperatures up to approximately 700°C (1300°F).
ASTM A 453_A453M Grade 660 stud bolts are widely used in gas turbines, boilers, petrochemical plants, refinery systems and high-temperature flanged connections where conventional alloy steel bolting materials may lose strength under elevated temperature service conditions.
These stud bolts are commonly supplied with matching ASTM A453 Grade 660 heavy hex nuts to ensure reliable fastening performance under severe operating environments.
We are a professional A453 Grade 660 Stud bolt and ASTM A453 Gr 660 Hex Nuts manufacturer and exporter in China.
What is ASTM A453 Grade 660?
ASTM A453 is a specification covering high-temperature bolting materials including:
- stud bolts
- hex bolts
- threaded rods
- nuts and fasteners
Grade 660, also known as Alloy A286, is a precipitation-hardened austenitic stainless steel alloy developed for elevated-temperature service applications requiring:
- high tensile strength
- excellent creep resistance
- oxidation resistance
- stable mechanical performance
ASTM A453 Grade 660 fasteners are widely selected for critical engineering applications operating under high pressure and high temperature conditions.
ASTM A453 Grade 660 Material Equivalents
| Standard | Equivalent Grade |
|---|---|
| UNS | S66286 |
| Alloy | A286 |
| ASTM | ASTM B638 Grade 660 |
| EN | 1.4980 |
ASTM A453 Grade 660 Specification
| Specification | Details |
|---|---|
| Material Standard | ASTM A453 / ASTM A453M |
| Grade | Grade 660 |
| Classes | Class A / B / C / D |
| Material Type | Austenitic Stainless Steel |
| Material Grade | UNS S66286 / Alloy A286 |
| Fastener Types | Stud Bolts, Hex Bolts, Threaded Rods, Hex Nuts |
| Dimension Standards | ASME B18.2.1 / ASME B18.3 |
| Thread Standard | ASME B1.1 2A / 3A Unified Threads |
| Additional Requirements | NACE MR0175 / MR0103 / ISO 15156 |
| Service Temperature | Up to Approx. 700°C |
ASTM A453 Grade 660 Stud Bolt Dimensions
| Product | Standard | Size Range | Length Range |
|---|---|---|---|
| ASTM A453 Grade 660 Stud Bolts | ASME B18.2.1 / B18.3 | M2 to M160 | 3 mm to 2000 mm |
Custom dimensions and threading can be supplied according to project specifications.
Chemical Composition of ASTM A453 Grade 660
ASTM A453 Grade 660 chemical composition provides excellent high-temperature strength and oxidation resistance.
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.08 |
| Silicon (Si) | — | 1.00 |
| Manganese (Mn) | — | 2.00 |
| Phosphorus (P) | — | 0.040 |
| Sulfur (S) | — | 0.030 |
| Chromium (Cr) | 13.50 | 16.00 |
| Nickel (Ni) | 24.00 | 27.00 |
| Molybdenum (Mo) | 1.00 | 1.50 |
| Titanium (Ti) | 1.90 | 2.35 |
| Aluminum (Al) | — | 0.35 |
| Vanadium (V) | 0.10 | 0.50 |
| Boron (B) | — | 0.01 |
| Iron (Fe) | Balance | Balance |
The high nickel and chromium content provides excellent oxidation and corrosion resistance at elevated temperatures.
Mechanical Properties of ASTM A453 Grade 660 Stud Bolts
ASTM A453 Grade 660 Class A, B and C
| Property | Requirement |
|---|---|
| Tensile Strength | 130 ksi [895 MPa] |
| Yield Strength | 85 ksi [585 MPa] |
| Elongation | 15% Minimum |
| Reduction of Area | 18% Minimum |
| Hardness | 248 – 341 HB |
| Rockwell Hardness | 24 – 37 HRC |
ASTM A453 Grade 660 Class D
| Property | Requirement |
|---|---|
| Tensile Strength | 130 ksi [895 MPa] |
| Yield Strength | 105 ksi [725 MPa] |
| Elongation | 15% Minimum |
| Reduction of Area | 18% Minimum |
| Hardness | 248 – 341 HB |
| Rockwell Hardness | 24 – 35 HRC |
These mechanical properties ensure excellent strength retention under elevated-temperature operating conditions.
Heat Treatment Requirements for ASTM A453 Grade 660
ASTM A453 Grade 660 stud bolts are precipitation-hardened through solution treatment and aging processes.
Grade 660 Class A
- Solution Treatment: 1650 ± 25°F [900 ± 14°C]
- Aging Treatment: 1325 ± 25°F [720 ± 14°C]
Grade 660 Class B
- Solution Treatment: 1800 ± 25°F [980 ± 14°C]
- Aging Treatment: 1325 ± 25°F [720 ± 14°C]
Grade 660 Class C
- Solution Treatment: 1800 ± 25°F [980 ± 14°C]
- Aging Treatment:
- 1425 ± 25°F [775 ± 14°C]
- followed by 1200 ± 25°F [650 ± 14°C]
Grade 660 Class D
- Solution Treatment:
- 1650 ± 25°F [900 ± 14°C]
- or 1800 ± 25°F [980 ± 14°C]
- Aging Treatment:
- 1325 ± 25°F [720 ± 14°C]
- optional secondary aging at 1200 ± 25°F [650 ± 14°C]
Proper heat treatment ensures:
- high creep resistance
- stable elevated-temperature strength
- improved fatigue resistance
NACE MR0175 Compliance
ASTM A453 Grade 660 stud bolts can be supplied for sour service applications according to:
- NACE MR0175
- NACE MR0103
- ISO 15156
Sour Service Requirements
- solution annealed and aged condition
- maximum hardness ≤ 35 HRC
Properly processed Grade 660 fasteners are suitable for H₂S service environments.
Impact Testing Requirements
ASTM A453 Grade 660 fasteners can be supplied with:
- minimum impact energy: 40 Joules at −196°C
Impact testing ensures reliable performance in extreme low-temperature and cryogenic environments.
Applications of ASTM A453 Grade 660 Stud Bolts
ASTM A453 Grade 660 high-temperature stud bolts are widely used in:
- gas turbines
- steam turbines
- power plants
- boilers
- heat exchangers
- petrochemical plants
- refinery systems
- offshore platforms
- high-temperature flanged connections
Their excellent creep resistance makes them suitable for severe thermal service conditions.
Advantages of ASTM A453 Grade 660 Stud Bolts
Excellent High-Temperature Strength
Maintains mechanical integrity at elevated temperatures.
Superior Creep Resistance
Suitable for long-term high-temperature service.
Good Corrosion Resistance
High nickel and chromium content improve oxidation resistance.
Stable Mechanical Performance
Reliable fastening performance under thermal cycling conditions.
Suitable for Critical Applications
Widely used in turbines, boilers and refinery systems.
Inspection and Testing
ASTM A453 Grade 660 stud bolts can be supplied with:
- PMI Testing
- Hardness Testing
- Ultrasonic Testing (UT)
- Mechanical Testing
- Impact Testing
- Heat Treatment Reports
- EN 10204 3.1 Certification
Third-party inspection is available upon request.
How to order our ASTM A453 Grade 660 Stud bolts?
M16 *160mm ASTM A453 Gr 660 Cl.A Stud bolt and A453 Gr 660 Cl.A Hex nuts
1 1/2″ * 12inch length,8UN, ASTM A453 Gr 660 Cl.A Stud bolt and A453 Gr 660 Cl.A nut ,BOLT & NUT, 8-UN,
FULL THREADED STUD BOLT ASTM A453 GR.660 CL.B W/ TWO HEAVY HEX NUTS ASTM A453 GR.660 CL.B
ASTM A286 A453 Grade 660 B638 Stainless steel Class a/B/C/D Stud Bolt Full Thread Rod
ASTM A453 Grade 660 stud bolts are commonly used together with the following high temperature fastening products:
