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m24 stud bolt, Zinc Nickel Bichromate Coating
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Product Details
| Place of Origin: | Shanghai, China | Brand Name: | Genrui | Model Number: | ASTM A 193 B7 |
| Standard: | ANSI |
Product Description
ASTM A193
The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature
or high pressure service. This specification includes fasteners intended for use in pressure vessels,
valves, flanges, and fittings. Although, this material is often available in inational coarse (UNC) thread pitches,
if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters
above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other
standard specifications not covered in this description including B5, B6, and B16.
A193 Grades
B7 | Alloy steel, AISI 4140/4142, quenched and tempered |
B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
B8M | Class 1 Stainless steel, AISI 316, carbide solution treated. |
B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
B8M | Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened |
A193 Mechanical Properties
Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
2-5/8 - 4 | 115 | 95 | 16 | 50 | |
4-1/8 - 7 | 100 | 75 | 18 | 50 | |
B8 Class 1 | All | 75 | 30 | 30 | 50 |
B8M Class 1 | All | 75 | 30 | 30 | 50 |
B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 |
7/8 - 1 | 115 | 80 | 15 | 35 | |
1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | |
1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | |
B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
7/8 - 1 | 100 | 80 | 20 | 45 | |
1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | |
1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
A193 Chemical Properties
Element | B7 (AISI 4140) | B8 (AISI 304) | B8M (AISI 316) |
Carbon | 0.37 - 0.49% | 0.08% max | 0.08% max |
Manganese | 0.65 - 1.10% | 2.00% max | 2.00% max |
Phosphorus, max | 0.035% | 0.045% | 0.045% |
Sulfur, max | 0.040% | 0.030% | 0.030% |
Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
Chromium | 0.75 - 1.20% | 18.0 - 20.0% | 16.0 - 18.0% |
Nickel |
| 8.0 - 11.0% | 10.0 - 14.0% |
Molybdenum | 0.15 - 0.25% |
| 2.00 - 3.00% |
A193 Recommended Hardware
Bolt Grade | Nuts | Washers |
B7 | A194 Grade 2H | F436 |
B8 Class 1 | A194 Grade 8 | SS304 |
B8M Class 1 | A194 Grade 8M | SS316 |
B8 Class 2 | A194 Grade 8 | SS304 |
B8M Class 2 | A194 Grade 8M | SS316 |
Contact Us
- Shanghai Genrui Industry Co., Ltd.
- Contact nameLg Zheng
- Phone86-021-63595065
- AddressNo. 1000
| Bolt | Hex socket cap head bolt | New Products | Nuts |
| Screws | Stud bolt | Threaded rod | U-bolt |
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