A193 B7 Stud Bolts
ASTM A193 B7 Stud Bolts are specially designed for flange bolting applications where accurate dimensions, reliable clamping force and long-term fastening performance are required. Unlike general threaded rods that are often supplied as long continuous threaded bars and cut according to installation needs, stud bolts are usually produced as finished components with defined lengths and thread configurations for direct assembly.
Manufactured according to ASTM A193 Grade B7 requirements, these stud bolts are made from chromium-molybdenum alloy steel and are commonly used together with ASTM A194 Grade 2H heavy hex nuts. The matched stud and nut assembly provides stable tightening performance for high pressure and high temperature bolting connections. ASTM A193 B7 Stud Bolts are widely used in flange connections for piping systems, pressure vessels, oil and gas facilities, petrochemical equipment and power generation plants. Depending on project requirements, they can be supplied in different diameters, lengths, thread forms and surface treatments to meet various industrial fastening conditions.
Specification of A193 B7 Stud Bolts:
The specification of ASTM A193 B7 stud bolts covers the key technical parameters required for manufacturing and selection, including diameter range, thread type, dimensional requirements, mechanical properties and available finishing options. Stud bolts can be produced with different thread configurations and lengths to meet specific assembly requirements.
The following specification table provides detailed information about ASTM A193 B7 stud bolts, including applicable standards, grade, tensile strength, compatible nuts, manufacturing processes and surface treatments. These specifications help ensure proper selection of stud bolts for different industrial fastening requirements.
| Product name | ASTM A193 B7 Stud Bolts |
|---|---|
| Diameter | 1/4″ – 4″ |
| Dimension Standard | ASME B18.31.2 |
| Thread | UNC/UNF/8UN |
| Tension Strength | 125 KSI |
| Compatible nuts/washers | A194 2H heavy hex nuts |
| Manufacturing Process | wire drawing, thread rolling, heat treatment, surface treatment |
| Surface treatment | Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating |
| Application Industry | Piping Systems/Pressure Vessels/Pressure Vessels/Oil and Gas Industry/Power Generation/Chemical Processing |
Chemical Composition:
| Property class | Material and heat treatment | Chemical composition limits (cast analysis, %) a | ||||||
|---|---|---|---|---|---|---|---|---|
| A193 B7 | Alloy steel, AISI 4140/4142 quenched and tempered | Carbon | Manganese | Phosphorus, max | Sulfur, max | Silicon | Chromium | Molybdenum |
| 0.37 - 0.49% | 0.65 - 1.10% | 0.035% | 0.040% | 0.15 - 0.35% | 0.75-1.2% | 0.15 - 0.25% | ||
Mechanical and physical properties:
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | HBW | Rockwell |
|---|---|---|---|---|---|---|---|
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | 321 max | 35 HRC max |
| 2-5/8 - 4 | 115 | 95 | 16 | 50 | |||
| 4-1/8 - 7 | 100 | 75 | 18 | 50 |
- RELATED WASHER LISTS:
- DIN125 Flat Washer
- DIN127 Spring Lock Washer
- F436 Hardened Steel Washers
- DIN9021 Large Washer
- ASME/ANSI B 18.21.1 (USS) Flat Washer
- ASME/ANSI B 18.21.1 (SAE) Flat Washer
- ASME/ANSI B18.21.1 Helical Spring-Lock Washer
- DIN25201 Stainless Steel Double Fold Self-locking Washer
- DIN6797A Stainless Steel External Teeth Lock Washers
- Stainless Steel DIN6797J Internal Teeth Lock Washers
Dimension Chart of ASTM A193 B7 Stud Bolts:
| Thread Diameter | Thread Per Inch | Chamfered Thread Distance | ||||
|---|---|---|---|---|---|---|
| UNC | UNF | 8UN | UNC | UNF | 8UN | |
| 1/4 | 20 | 28 | - | 0.05-0.1 | 0.036-0.071 | - |
| 5/16 | 18 | 24 | - | 0.056-0.111 | 0.042-0.083 | - |
| 3/8 | 16 | 24 | - | 0.063-0.125 | 0.042-0.083 | - |
| 7/16 | 14 | 20 | - | 0.072-0.143 | 0.05-0.1 | - |
| 1/2 | 13 | 20 | - | 0.077-0.154 | 0.05-0.1 | - |
| 9/16 | 12 | 18 | - | 0.084-0.167 | 0.056-0.111 | - |
| 5/8 | 11 | 18 | - | 0.091-0.182 | 0.056-0.111 | - |
| 3/4 | 10 | 16 | - | 0.1-0.2 | 0.063-0.125 | - |
| 7/8 | 9 | 14 | - | 0.111-0.222 | 0.072-0.143 | - |
| 1 | 8 | 12 | - | 0.125-0.25 | 0.084-0.167 | - |
| 1-1/8 | 7 | 12 | - | 0.143-0.286 | 0.084-0.167 | - |
| 1-1/4 | 7 | 12 | - | 0.143-0.286 | 0.084-0.167 | - |
| 1-3/8 | 6 | 12 | - | 0.167-0.333 | 0.084-0.167 | - |
| 1-1/2 | 6 | 12 | - | 0.167-0.333 | 0.084-0.167 | - |
| 1-5/8 | - | - | 8 | 0.125-0.25 | ||
| 1-3/4 | 5 | - | 8 | 0.2-0.4 | 0.125-0.25 | |
| 1-7/8 | - | - | 8 | 0.125-0.25 | ||
| 2 | 4-1/2 | - | 8 | 0.222-0.444 | 0.125-0.25 | |
| 2-1/4 | 4-1/2 | - | 8 | 0.222-0.444 | 0.125-0.25 | |
| 2-1/2 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
| 2-3/4 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
| 3 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
| 3-1/4 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
| 3-1/2 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
| 3-3/4 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
| 4 | 4 | - | 8 | 0.25-0.5 | 0.125-0.25 | |
FAQ about A193 B7 Stud Bolts:
1.What’s the price of type1 of A193 b7 stud bolts?
In general, our A193 b7 stud bolt are made of alloy steel 42crmoa. The price is made up of materials, processing, packaging and labor costs. We are focused on the production of bolts/nuts factory, committed to making our customers profitable. The wholesale price of A193 b7 stud bolts is 1500-2000usd/ton. The material price of steel will fluctuate frequently, and the price is different for different surface treatment/quantity, so please send the inquiry to our email for the specific price. Emai: info@china-bolts.com
2.How many days does it take you to produce a container of stud bolts?
Our daily production capacity of A193 b7 stud bolt is about 20 tons, but due to the arrangement of materials, heat treatment, surface treatment, order scheduling takes time. The average delivery time of bolts for a container is 30-40 days.
3.What countries do you export your a193 b7 stud bolt to? Whether mechanical properties can be guaranteed.
We have stable customers in the United States, Germany, Russia, Poland, Spain, Brazil, Argentina, Vietnam, Canada, Australia, UAE, Saudi Arabia and other countries for more than 10 years. Our bolts are guaranteed to meet ASTM A193 standard mechanical performance requirements.
4.Can you provide samples of A193 b7 stud bolt?
Yes, we have some samples in regular sizes. Samples can be provided free of charge. But the customer needs to bear the freight.
5. Do you have a minimum order quantity requirement?
Yes, the MOQ we usually produce is about one ton.