The ASTM A453 Grade 660 specification describes the standards of studs, bolts, nuts and other fasteners that are used in high-temperature bolting. This material is grouped in four types of properties (A, B, C, and D) that have certain tensile and stress rupture characteristics. Grade 660 bolts are commonly utilized to secure elements in boilers, pressure vessels, gasketed pipeline flanges and valves that are to be used in high temperature service. ASTEM A453 Grade 660 material has the same chemical composition as ASTM B638 Grade 660 stainless steel alloy (better known as Alloy A286 or UNS S66286), but is heat-treated to obtain the mechanical properties of Grade 660 described in the ASTM A453 standard. These requirements are defined to assure uniform quality and performance under a well-known ASTM standard that regulates the mechanical and the chemical properties that are used reliably in a harsh environment.
ASTM A453 Gr 660 Stud Bolt, UNS S66286 Half Threaded Stud Bolt, DIN 1.4944 Double End Threaded Rod, Grade 660 Full Threaded Rod, ASME SA453 Gr.660 Full Threaded Stud Bolt Supplier
Jade Special Metals is a leading producer, distributor, and exporter of high-performance ASTM bolts, A453 GR.660 fasteners. Our ASTM A453 Grade 660 fasteners are made using Alloy A286 (UNS S66286) to obtain the most stringent industry requirements. Our products are in full assortment of A453 660 bolts, studs, and nuts of all categories (A, B, C, and D), of certified quality and competitive prices to customers in the worldwide aerospace, power generation, and petrochemical sectors.
Table of Contents
- Types of ASTM A453 Gr 660 Fasteners
- ASTM A453 Gr 660 Stud Bolt Specification
- Equivalent Grades ASTM A453 Grade 660 Stud Bolt
- ASTM A453 Grade 660 Bolts Chemical Composition
- Mechanical Properties ASTM A453 Gr 660 Bolts
- ASTM A453 Gr 660 Stud Bolt Dimensions Chart
- Dimensions of A453 Gr 660 Heavy Hex Bolts
- ASTM A453 Grade 660 Bolts Size Chart
- ASTM A453 Gr. 660 Bolts Inventory
- Applications of ASTM A453 Gr. 660 Fasteners
Types of ASTM A453 Gr 660 Fasteners
ASTM A453 Gr 660 Stud Bolts
ASTM A453 Gr 660 Hex Bolts
ASTM A453 Gr 660 Heavy Hex Nuts
ASTM A453 Gr 660 Hex Cap Screws
ASTM A453 Gr 660 Socket Head Cap Screws
ASTM A453 Gr 660 Heavy Hex Bolts
ASTM A453 Gr 660 U-Bolts
ASTM A453 Gr 660 Washers
ASTM A453 Gr 660 Bolts
ASTM A453 Gr 660 Stud Bolt Specification
| Property | Details |
|---|---|
| Dimensions | ASME B18.2.1, B18.3 |
| Melt Origin | East Europe/South America/Korea/Japan |
| Product Origin | Made in India |
| Threads Configuration | ASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads |
| Certification | Dual Certified As per ASTM & ASME Codes |
| Additional Certifications | PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
| Mandatory Requirements | Free from Mercury & Radioactive Contamination |
| Additional Requirements | NACE MR0103 / MR0175 / ISO 15156 Compliance |
Equivalent Grades ASTM A453 Grade 660 Stud Bolt
| 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 |
ASTM A453 Grade 660 Bolts Chemical Composition
| Element | Content (%) |
|---|---|
| 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 | – |
Mechanical Properties ASTM A453 Gr 660 Bolts
| Grade | Class | Tensile Strengtd | Yield Strengtd | 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 |
ASTM A453 Gr 660 Stud Bolt Dimensions Chart
| Nominal Size Diameter, D inch |
Tap End Full Thread Length, BM |
Umax = 2P | Minimum Nut End Full Thread Length, Bmin |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Nominal | Min. | Max. | UNC & NC-5 Thread |
UNF Thread | 8UN Thread | L ≤ 10 | 10 < L ≤ 16 | L > 16 | |
| 1/4 | 0.375 | 0.350 | 0.400 | 0.100 | 0.071 | … | 0.750 | 1.000 | 1.500 |
| 5/16 | 0.469 | 0.440 | 0.498 | 0.111 | 0.083 | — | 0.875 | 1.125 | 1.625 |
| 3/8 | 0.563 | 0.532 | 0.594 | 0.125 | 0.083 | — | 1.000 | 1.250 | 1.750 |
| 7/16 | 0.656 | 0.620 | 0.692 | 0.143 | 0.100 | — | 1.125 | 1.375 | 1.875 |
| 1/2 | 0.750 | 0.708 | 0.792 | 0.154 | 0.100 | — | 1.250 | 1.500 | 2.000 |
| 9/16 | 0.844 | 0.802 | 0.896 | 0.167 | 0.111 | — | 1.375 | 1.625 | 2.125 |
| 5/8 | 0.938 | 0.892 | 0.983 | 0.182 | 0.111 | — | 1.500 | 1.750 | 2.250 |
| 3/4 | 1.1.25 | 1.075 | 1.175 | 0.200 | 0.125 | — | 1.750 | 2.000 | 2.500 |
| 7/8 | 1.313 | 1.258 | 1.368 | 0.222 | 0.143 | — | 2.000 | 2.250 | 2.750 |
| 1 | 1.500 | 1.438 | 1.562 | 0.250 | 0.167 | — | 2.250 | 2.500 | 3.000 |
| 1 1/8 | 1.688 | 1.625 | 1.750 | 0.286 | 0.167 | 0.250 | 2.500 | 2.750 | 3.250 |
| 1 1/4 | 1.875 | 1.813 | 1.938 | 0.286 | 0.167 | 0.250 | 2.750 | 3.000 | 3.500 |
| 1 3/8 | 2.063 | 2.000 | 2.125 | 0.333 | 0.167 | 0.250 | 3.000 | 3.250 | 3.750 |
| 1 1/2 | 2.250 | 2.188 | 2.313 | 0.333 | 0.167 | 0.250 | 3.250 | 3.500 | 4.000 |
| 1 5/8 | 2.438 | 2.375 | 2.500 | — | — | 0.250 | 3.500 | 3.750 | 4.250 |
| 1 3/4 | 2.625 | 2.563 | 2.688 | 0.400 | — | 0.250 | 3.750 | 4.000 | 4.500 |
| 1 7/8 | 2.813 | 2.750 | 2.875 | — | — | 0.250 | 4.000 | 4.250 | 4.750 |
| 2 | 3.000 | 2.925 | 3.075 | 0.444 | — | 0.250 | 4.250 | 4.500 | 5.000 |
| 2 1/4 | 3.375 | 3.300 | 3.450 | 0.444 | — | 0.250 | 4.750 | 5.000 | 5.500 |
| 2 1/2 | 3.750 | 3.675 | 3.825 | 0.500 | — | 0.250 | 5.250 | 5.500 | 6.000 |
| 2 3/4 | 4.125 | 4.050 | 4.200 | 0.500 | — | 0.250 | 5.750 | 6.000 | 6.500 |
| 3 | 4.500 | 4.425 | 4.575 | 0.500 | — | 0.250 | — | 6.500 | 7.000 |
| 3 1/4 | 4.875 | 4.775 | 4.975 | 0.500 | — | 0.250 | — | 7.000 | 7.500 |
| 3 1/2 | 5.250 | 5.150 | 5.350 | 0.500 | — | 0.250 | — | 7.500 | 8.000 |
| 3 3/4 | 5.625 | 5.525 | 5.725 | 0.500 | — | 0.250 | — | 8.000 | 8.500 |
| 4 | 6.000 | 5.900 | 6.100 | 0.500 | — | 0.250 | — | 8.500 | 9.000 |
Dimensions of A453 Gr 660 Heavy Hex Bolts
| Grade 660 Bolts Diameter (D) | Body Diameter (D) | Across the Flats (F) | Across the Corners © | Head Height (H) | Thread Lengths (T) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| MAX | MIN | MAX | MIN | MAX | MIN | MAX | MIN | < 6” | > 6” | |
| 1/2 | 0.515 | 0.482 | 0.875 | 0.85 | 1.01 | 0.969 | 0.364 | 0.302 | 1.25 | 1.5 |
| 5/8 | 0.642 | 0.605 | 1.062 | 1.031 | 1.227 | 1.175 | 0.444 | 0.378 | 1.5 | 1.75 |
| 3/4 | 0.768 | 0.729 | 1.25 | 1.212 | 1.443 | 1.383 | 0.524 | 0.455 | 1.75 | 2 |
| 7/8 | 0.895 | 0.852 | 1.438 | 1.394 | 1.66 | 1.589 | 0.604 | 0.531 | 2 | 2.25 |
| 1 | 1.022 | 0.976 | 1.625 | 1.575 | 1.876 | 1.796 | 0.7 | 0.591 | 2.25 | 2.5 |
| 1 1/8 | 1.149 | 1.098 | 1.812 | 1.756 | 2.093 | 2.002 | 0.78 | 0.658 | 2.5 | 2.75 |
| 1 1/4 | 1.277 | 1.223 | 2 | 1.938 | 2.309 | 2.209 | 0.876 | 0.749 | 2.75 | 3 |
| 1 3/8 | 1.404 | 1.345 | 2.188 | 2.119 | 2.526 | 2.416 | 0.94 | 0.81 | 3 | 3.25 |
| 1 1/2 | 1.531 | 1.47 | 2.375 | 2.3 | 2.742 | 2.622 | 1.036 | 0.902 | 3.25 | 3.5 |
| 1 3/4 | 1.785 | 1.716 | 2.75 | 2.662 | 3.175 | 3.035 | 1.196 | 1.054 | 3.75 | 4 |
| 2 | 2.039 | 1.964 | 3.125 | 3.025 | 3.608 | 3.449 | 1.388 | 1.175 | 4.25 | 4.5 |
| 2 1/4 | 2.305 | 2.214 | 3.5 | 3.388 | 4.041 | 3.862 | 1.548 | 1.327 | 4.75 | 5 |
| 2 1/2 | 2.559 | 2.461 | 3.875 | 3.75 | 4.474 | 4.275 | 1.708 | 1.479 | 5.25 | 5.5 |
| 2 3/4 | 2.827 | 2.711 | 4.25 | 4.112 | 4.907 | 4.688 | 1.869 | 1.632 | 5.75 | 6 |
| 3 | 3.081 | 2.961 | 4.625 | 4.475 | 5.34 | 5.102 | 2.06 | 1.815 | 6.25 | 6. |
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ASTM A453 Grade 660 Bolts Size Chart
| Nominal Basic | Size or Screw | Body | D Diameter | Head | A Diameter | Head | H Height | $ Head Side Height | J Hex Socket Size | T Key Engagmt | G Wall Thkns | K Chamfer or Radius |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diameter | Max | Min | Max | Min | Max | Min | Max | Nominal | Min | Min | Max | |
| 0 | 0.0600 | 0.0600 | 0.0568 | 0.096 | 0.091 | 0.060 | 0.057 | 0.054 | 0.050 | 0.025 | 0.020 | 0.003 |
| 1 | 0.0730 | 0.0730 | 0.0695 | 0.118 | 0.112 | 0.073 | 0.070 | 0.066 | 1/16 0.062 | 0.031 | 0.025 | 0.003 |
| 2 | 0.0860 | 0.0860 | 0.0822 | 0.140 | 0.134 | 0.086 | 0.083 | 0.077 | 5/64 0.078 | 0.038 | 0.029 | 0.003 |
| 3 | 0.0990 | 0.0990 | 0.0949 | 0.161 | 0.154 | 0.099 | 0.095 | 0.089 | 5/64 0.078 | 0.044 | 0.034 | 0.003 |
| 4 | 0.1120 | 0.1120 | 0.1075 | 0.183 | 0.176 | 0.112 | 0.108 | 0.101 | 3/32 0.094 | 0.051 | 0.038 | 0.005 |
| 5 | 0.1250 | 0.1250 | 0.1202 | 0.205 | 0.198 | 0.125 | 0.121 | 0.112 | 3/32 0.094 | 0.057 | 0.043 | 0.005 |
| 6 | 0.1380 | 0.1380 | 0.1329 | 0.226 | 0.218 | 0.138 | 0.134 | 0.124 | 7/64 0.109 | 0.064 | 0.047 | 0.005 |
| 8 | 0.1640 | 0.1640 | 0.1585 | 0.270 | 0.262 | 0.164 | 0.159 | 0.148 | 9/64 0.141 | 0.077 | 0.056 | 0.005 |
| 10 | 0.1900 | 0.1900 | 0.1840 | 0.312 | 0.303 | 0.190 | 0.185 | 0.171 | 5/32 0.156 | 0.090 | 0.065 | 0.005 |
| 1/4 | 0.2500 | 0.2500 | 0.2435 | 0.375 | 0.365 | 0.250 | 0.244 | 0.225 | 3/16 0.188 | 0.120 | 0.095 | 0.008 |
| 5/16 | 0.3125 | 0.3125 | 0.3053 | 0.469 | 0.457 | 0.312 | 0.306 | 0.281 | 1/4 0.250 | 0.151 | 0.119 | 0.008 |
| 3/8 | 0.3750 | 0.3750 | 0.3678 | 0.562 | 0.550 | 0.375 | 0.368 | 0.337 | 5/16 0.312 | 0.182 | 0.143 | 0.008 |
| 7/16 | 0.4375 | 0.4375 | 0.4294 | 0.656 | 0.642 | 0.438 | 0.430 | 0.394 | 3/8 0.375 | 0.213 | 0.166 | 0.010 |
| 1/2 | 0.5000 | 0.5000 | 0.4919 | 0.750 | 0.735 | 0.500 | 0.492 | 0.450 | 3/8 0.375 | 0.245 | 0.190 | 0.010 |
| 5/8 | 0.6250 | 0.6250 | 0.6163 | 0.938 | 0.921 | 0.625 | 0.616 | 0.562 | 1/2 0.500 | 0.307 | 0.238 | 0.010 |
| 3/4 | 0.7500 | 0.7500 | 0.7406 | 1.125 | 1.107 | 0.750 | 0.740 | 0.675 | 5/8 0.625 | 0.370 | 0.285 | 0.010 |
| 7/8 | 0.8750 | 0.8750 | 0.8647 | 1.312 | 1.293 | 0.875 | 0.864 | 0.787 | 3/4 0.750 | 0.432 | 0.333 | 0.015 |
| 1 | 1.0000 | 1.0000 | 0.9886 | 1.500 | 1.479 | 1.000 | 0.988 | 0.900 | 3/4 0.750 | 0.495 | 0.380 | 0.015 |
| See Notes | 1 | 2,15 | 3 | 4 | 21 | 6 |
ASTM A453 Gr. 660 Bolts Inventory
ASTM A453 Gr. 660 Bolts
ASTM A453 Gr. 660 Stud Bolts
ASTM A453 Gr. 660 Hex Bolts
Applications of ASTM A453 Gr. 660 Fasteners
- Pharmaceutical Equipment
- Sea Water Equipment
- Heat Exchangers
- Gas Processing
- Specialty Chemicals
- Aircraft Exhaust Manifolds
- Pharmaceuticals
- Off-Shore Oil Drilling Companies
- Power Generation
- Petrochemicals
Related Products
Frequently Asked Questions About ASTM A453 Gr. 660 Bolts
What is ASTM A453 GR 660 material?
ASTM A453 Grade 660 (Class A) is a high-strength fasteners with grade of austenitic stainless steel, which is age-hardenable. The material is designed to be used in service at high temperature, high-pressure, and it has good corrosion resistance, tensile strength and yield strength.
What is the difference between ASTM A 453 GR 660 Class A and Class B Studbolts?
This fundamental distinction is the heat treatment. They are both solution annealed and precipitation hardened. Class B however has an extra processing of cold working followed by hardening, making the fastener generally stronger and has higher resistance to fatigue as well as stress corrosion cracking than Class A.
What is ASTM A453 GR 660 equivalent to?
ASTM A453 Grade 660 is functionally and chemically identical to Alloy A286 and UNS S66286 stainless steel. Other similar designations of material are AISI Grade 660, BS HR 51, and W. Nr. 1.4944. All these are precipitation hardened austenitic stainless steels designed to be used in sensitive high temperature processes.
