Premium ASTM A193 B7 Bolts & Fasteners Manufacturer and Supplier
Welcome to Jade Special Metals, your trusted international supplier and producer of superior A193 B7 fasteners. Specified under ASTM A193/ASME SA193 these chromium-molybdenum alloy steel bolts are the industry standard for high-pressure, high-temperature, and special-purpose applications. Our wide ranging inventory of ASTM A193 B7 Bolts guarantees you get certified, high-performance components for your critical projects, manufactured to the highest quality standards.
Quick Section Links
- What Are A193 B7 Fasteners?
- Types of A193 B7 Fasteners
- ASTM A193 B7 Bolts Specifications
- A193 B7 Chemical Composition (AISI 4140)
- ASTM A193 B7 Mechanical Properties
- Heat Treatment & Hardness of ASTM A193 B7 Bolts
- Recommended Hardware
- Dimensions Of ASTM A193 B7 Bolts
- ASTM A193 B7 Bolts Weight Chart
- ASTM A193 B7 Bolt Torque Chart
- ASTM A193 B7 Bolts Inventory
- Applications of ASTM A193 B7 Bolts
What Are A193 B7 Fasteners?
ASTM A193 B7 fasteners are high-strength bolts, studs, and threaded rods made from heat-treated chromium-molybdenum (Cr-Mo) alloy steel (AISI 4140/4142). This grade is known for its exceptional strength and reliable performance up to 450°C (840°F). These fasteners are quenched and tempered, making them a common choice for pressure vessels, pipe flanges, valves, and fittings in the oil, gas, and petrochemical industries. They are typically paired with ASTM A194 Grade 2H heavy hex nuts.
B7 bolts are the industry benchmark for high-pressure bolting. They offer a minimum tensile strength of 125 ksi (860 MPa) and resist creep up to 450°C. The heat treatment provides excellent toughness and hardness, making them durable against wear. Made from Cr-Mo alloy steel, they balance strength and malleability. B7 fasteners are widely available, globally preferred, and can be coated for use in more corrosive environments.
Types of A193 B7 Fasteners
A193 B7 Stud Bolts
A193 B7 Hex Bolts
A193 B7 Anchor Bolts
A193 B7 Threaded Rods
A193 B7 Socket Head Cap Screws
A193 B7 Heavy Hex Bolts
A193 B7 U-Bolts
A193 B7 Washers
ASTM A193 B7 Bolts Specifications
| Specification | ASTM A193 / ASME SA193 |
| Dimensions | ASME B18.2.1, B18.3 |
| Size | M02 to M160, Custom Sizes |
| Lengtd | 3 mm to 200 mm |
| tdreads | METRIC, BSW, BSF, UNC, UNF or as required |
| In Form of | Hex, Square, Round, tdreading as per Gauge Etc. |
| Test Certificate: | Manufacturer Test Certificate as per EN 10204 / 3.1 |
| Surface finishing | Zinc (yellow, white, blue, black), black oxide, Geometry, Dacroment, anodizing, nickel plated, plated zinc-nickel, Stainless steel: Passivated Self-Colour, Hot Dip Galvanised (HDG), Bright Zinc Plated (BZP), Sherardized, Stainless Steel, Mechanically Applied coating and some special one like DACROMET |
| Production process | M2-M24: Cold Froging, hot forging M24-M100, machining and CNC for Customized connecting element |
| Surface Coating |
All surface finishes offered including Geomet & PTFE, Galvanised, Zinc, Electroless Nickel, Sherardized, Dacromet |
| Packing | IN BULK: canton, pallet, Small Boxs / carton / pallet, or customer request |
A193 B7 Chemical Composition (AISI 4140)
| Element | Content (%) |
| Carbon (C) | 0.37 – 0.49% |
| Manganese (Mn) | 0.65 – 1.10% |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.040% max |
| Silicon (Si) | 0.15 – 0.35% |
| Chromium (Cr) | 0.75 – 1.20% |
| Molybdenum (Mo) | 0.15 – 0.25% |
ASTM A193 B7 Mechanical Properties
| Diameter Size | Tensile Strength (min, ksi) | Yield Strength (min, ksi) | Elongation (min, %) | Reduction of Area (min, %) |
| Up to 2-1/2″ | 125 | 105 | 16 | 50 |
| Over 2-1/2″ to 4″ | 115 | 95 | 16 | 50 |
| Over 4″ to 7″ | 100 | 75 | 18 | 50 |
Heat Treatment & Hardness of ASTM A193 B7 Bolts
- Heat Treatment: All ASTM A193 Grade B7 Bolts must be heat-treated by quenching and tempering at a minimum temperature of 1150°F (620°C).
- Hardness: Maximum Rockwell Hardness of 35 HRC.
Recommended Hardware
| Bolt Grade | Recommended Nut | Recommended Washer |
| ASTM A193 B7 | ASTM A194 Grade 2H Heavy Hex | ASTM F436 Hardened |
Dimensions Of ASTM A193 B7 Bolts
| **All measurements in millimeters** | ||||||||
| NOMINAL SIZE (D) | BODY DIAMETER | HEAD tdICKNEASTM A193 | ACROASTM A193 tdE FLATS | ACROASTM A193 CORNERS | ||||
| D (MAX) | D (MIN) | H (MAX) | H (MIN) | F (MAX) | F (MIN) | C (MAX) | C (MIN) | |
| m10 | 10.00 | 9.78 | 6.63 | 6.17 | 17.00 | 15.73 | 18.48 | 17.77 |
| m12 | 12.00 | 11.73 | 7.76 | 4.24 | 19.00 | 17.73 | 20.78 | 20.03 |
| m14 | 14.00 | 13.73 | 9.09 | 8.51 | 22.00 | 20.67 | 24.25 | 23.35 |
| m16 | 16.00 | 15.73 | 10.32 | 9.68 | 24.00 | 23.67 | 27.71 | 26.75 |
| m20 | 20.00 | 19.67 | 12.88 | 12.12 | 30.00 | 29.16 | 34.64 | 32.95 |
| m24 | 24.00 | 23.67 | 15.44 | 14.56 | 36.00 | 35.00 | 41.57 | 39.55 |
| m30 | 30.00 | 29.67 | 19.48 | 17.92 | 46.00 | 45.00 | 53.12 | 50.85 |
| m36 | 36.00 | 35.61 | 23.38 | 21.63 | 55.00 | 53.80 | 63.51 | 60.79 |
| m42 | 42.00 | 41.38 | 26.97 | 25.03 | 65.00 | 62.90 | 75.06 | 71.71 |
| m48 | 48.00 | 47.38 | 31.07 | 28.93 | 75.00 | 72.60 | 86.60 | 82.76 |
| m56 | 56.00 | 55.26 | 36.2 | 33.80 | 85.00 | 82.20 | 98.15 | 93.71 |
| m64 | 64.00 | 63.26 | 41.32 | 38.68 | 95.00 | 91.80 | 109.70 | 104.65 |
| m72 | 72.00 | 71.26 | 46.45 | 43.55 | 105.00 | 101.40 | 121.24 | 115.60 |
| m80 | 80.00 | 79.26 | 51.58 | 48.42 | 115.00 | 111.00 | 132.72 | 126.54 |
| m90 | 90.00 | 89.13 | 57.74 | 54.26 | 130.00 | 125.50 | 150.11 | 143.07 |
| m100 | 90.00 | 99.13 | 63.9 | 60.10 | 145.00 | 140.00 | 167.43 | 159.60 |
“Contact Jade Special Metals today with your requirement for ASTM A193 B7 Bolts. We assure you of the best quote.
ASTM A193 B7 Bolts Weight Chart
| Length | 1/2″ | 3/4″ | 1″ | 1-1/2″ |
| 4″ | 0.17 | 0.40 | 0.74 | 1.77 |
| 6″ | 0.26 | 0.61 | 1.11 | 2.66 |
| 8″ | 0.35 | 0.81 | 1.48 | 3.55 |
| 10″ | 0.43 | 1.01 | 1.85 | 4.44 |
| 12″ | 0.52 | 1.22 | 2.22 | 5.33 |
ASTM A193 B7 Bolt Torque Chart
| Diameter | Threads (TPI) | Tightening Torque (ft-lbs) |
| 1/2″ | 13 | 70 |
| 5/8″ | 11 | 139 |
| 3/4″ | 10 | 247 |
| 7/8″ | 9 | 398 |
| 1″ | 8 | 596 |
| 1-1/4″ | 7 | 1192 |
| 1-1/2″ | 8 | 2203 |
ASTM A193 B7 Bolts Inventory
ASTM A193 B7 Bolts
ASTM A193 B7 Stud Bolts
ASTM A193 B7 Hex Bolts
Applications of ASTM A193 B7 Bolts
Our A193 B7 bolts are trusted in the world’s most demanding environments:
Oil & Gas: Flange bolting, pressure vessels, pipelines.
Petrochemical & Refining: Reactors, heat exchangers, and process equipment.
Power Generation: Turbines, boilers, and high-pressure steam lines.
Heavy Construction & Engineering: Critical structural connections.
Manufacturing: Valves, pumps, and heavy machinery assembly.
Why Choose Us as Your A193 B7 Fastener Supplier?
- Certified Quality: We offer all A193 B7 Fasteners with Mill Test Certificates (MTC) to EN 10204 3.1 guaranteeing full accountability and compliance.
- Leading Manufacturer & Stockist: As a direct manufacturer, we control quality and offer the most reasonable price. Our large inventory ensures fast lead times.
- Global Exporter: We have a proven track record exporting our products to large industrial projects worldwide.
- Customization: We can manufacture custom lengths, threads and customized fasteners to your exact requirements.
- Expert Support: Our technical sales team is ready to help you in choosing the correct fasteners for your application.
Related Products
ASTM A193 B7 fasteners are part of a broader range of high-performance bolting solutions designed for use in high-pressure and high-temperature environments. Explore our full range of related products:
Get a Competitive Price & Quote for Your ASTM A193 B7 Bolts
As a leading manufacturer and direct supplier, Jade Special Metals offers a significant advantage in sourcing your A193 B7 High Tensile Fasteners. By managing the production process in-house, we ensure a highly competitive price by eliminating unnecessary markups.
The final cost for your order is tailored to your specific project needs. Pricing for ASTM A193 B7 Bolts can vary based on factors like dimensions, order volume, and any required protective coatings (such as PTFE or Hot-Dip Galvanizing). For this reason, we provide custom quotes to guarantee you receive the most accurate and fair pricing.
Ready to secure the highest quality fasteners for your project? Contact our expert sales team today for a fast, no-obligation quote. Let us know your requirements—such as product type, size, and quantity—and we will provide a detailed proposal. We are committed to delivering certified A193 B7 Fasteners on-time and at the best possible value.
FAQ’s About ASTM A193 B7 Bolts
What is A193 B7 bolt specification?
The ASTM A193 B7 specification defines a high-tensile fastener made from heat-treated chromium-molybdenum (Cr-Mo) alloy steel (typically AISI 4140). It requires a minimum tensile strength of 125 ksi, a minimum yield strength of 105 ksi, and has a maximum hardness of 35 HRC, making it ideal for high-pressure and high-temperature service.
What is ASTM A193 B7 material equivalent to?
ASTM A193 Grade B7M bolts and studs are identical in chemistry to Grade B7 (quenched and tempered medium carbon alloy steel), but have lower strength requirements and require 100% hardness testing of all fasteners manufactured in the lot.
What is the difference between A193 B7 and B7M?
A193 B7M has the same chemical composition as B7 but is manufactured to have lower tensile strength and hardness. B7M bolts are specifically intended for use in corrosive or sour gas (H₂S) service and require 100% hardness testing on all fasteners in a lot to ensure they meet the lower, more controlled hardness limits.
How many threads per inch is A193 B7?
The thread pitch depends on the bolt’s diameter. For traditional applications, A193 B7 bolts typically follow the Unified National Coarse (UNC) thread series. A common rule is that for diameters over 1 inch, the specification is 8 threads per inch (8-TPI).
Is A193 B7 bolt material carbon steel?
No. A193 B7 is an alloy steel, not a carbon steel. The addition of chromium and molybdenum gives it superior strength and temperature resistance compared to standard carbon steels. It achieves its high strength through a specific quenching and tempering heat treatment process.
Do B7 bolts rust?
Yes. Since A193 B7 is an alloy steel and not a stainless steel, it will rust if exposed to moisture or corrosive environments. To prevent this, B7 bolts are often supplied with a protective coating, such as PTFE (Teflon/Xylan), Zinc Plating,
