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The Mumbai, India-based Fasteners Mart is a leading producer and supplier of quality fasteners, including ASTM A193 B8M bolts. These bolts are produced from high-quality stainless steel, providing maximum strength, corrosion resistance, and performance in severe environments. Being high-pressure and high-temperature-capable, ASTM A193 B8M bolts are ideal for use in petrochemical, power generation, and marine engineering sectors. The Fasteners Mart is committed to delivering sound, customized fastening solutions with on-time delivery and superior customer service to meet the diverse needs of customers in a variety of industries.
ASTM A193 B8M bolts are made from austenitic stainless steel containing 18-20% chromium and 8-10% nickel in dominant proportions, with the remainder iron and trace amounts of manganese, silicon, and carbon. The addition of 2.0-3.0% molybdenum provides enhanced crevice and pitting corrosion resistance. Mechanical properties include tensile strength 70-100 ksi (485-690 MPa) and yield strength not lower than 30 ksi (205 MPa). These bolts exhibit good ductility, toughness, and stress corrosion cracking resistance and are therefore best suited for severe environments in petrochemical, chemical, and marine applications.
| Element | B7 | B8 | B8M |
| 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% |
| 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 |
|
Material |
Specification |
Standards |
Size
|
Length |
|
ASTM A193 B8M Bolt
|
IS
BS
ASTM
|
DIN, ISO, JIS, GB, IS, BS, ASTM |
M 02 to M 160
|
3 mm to 200 mm
|
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
ASTM A193 B8M bolts are used in high-strength, corrosion-resistant, and durability-critical applications in severe environments. They have good pitting, crevice corrosion, and high-temperature resistance, making them fit for petrochemical, chemical processing, power generation, and marine engineering applications. Common applications involve retaining parts in pressure vessels, heat exchangers, reactors, turbines, and piping systems. These bolts work under high pressure and high temperature, thus making them essential for machinery operating in harsh environments. ASTM A193 B8M bolts also find applications in aerospace, construction, and automotive sectors with continuous performance and lasting durability.
ASTM A193 B8M bolts are carefully packaged to prevent damage during transportation and ensure safe transportation. They are normally packaged in heavy-duty cartons, moisture-proof packaging, or wooden crates to prevent corrosion and physical damage. Every batch is tested rigorously, including tensile strength, hardness, dimensional tolerance, and corrosion resistance, before shipment to guarantee ASTM standards compliance. Detailed certificates of compliance and test reports are provided, assuring customers that the bolts meet the required specifications for high-performance and critical industrial applications.
The Fasteners Mart is a leading manufacturer and supplier of high-quality fasteners in Mumbai, India, with over 8 years of experience serving global industries.
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