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Based in Delhi, India, Punit Fasteners is a reputable manufacturer and supplier of ASTM A193 B8 Fasteners. We provide dependable fastening solutions to sectors like petrochemicals, power generation, oil & gas, and construction with an emphasis on precision engineering and high standards. Austenitic stainless steel, the material used to make our ASTM A193 B8 fasteners, provides exceptional strength, durability, and resistance to corrosion in high-temperature and high-pressure settings. Punit Fasteners has established itself as a reliable brand for durable and high-performing industrial fasteners in both domestic and international markets thanks to a solid supply chain, prompt deliveries, and customer-focused service.
AISI 304 stainless steel is used in the production of ASTM A193 B8 fasteners. Typically, they contain 8–10.5% nickel and 18–20% chromium, with trace amounts of silicon, carbon, phosphorus, and manganese. These fasteners have outstanding mechanical strength and resistance to corrosion. They provide good elongation and ductility, a yield strength of 30 ksi (205 MPa), and a minimum tensile strength of 75 ksi (515 MPa). ASTM A193 B8 fasteners offer a balance between mechanical performance and resistance to chemical and atmospheric corrosion, making them ideal for high-temperature and high-pressure 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 B8 Fasteners
|
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 B8 fasteners are widely used in high-strength applications and require corrosion resistance. Typical applications include oil refineries, power plants, and the marine environment. Components are protected in areas of high pressure and high temperatures such as valves, flanges, and fittings. Their austenitic stainless steel design ensures durability and reliability, making them ideal for use in harsh chemical and industrial applications These fasteners meet industry standards a strength, improving safety and performance in critical areas.
In industries where exceptional strength and resistance to corrosion are crucial, ASTM A193 B8 fasteners are widely utilised. Boilers, piping systems, heat exchangers, and pressure vessels are typical uses in the petrochemical, chemical, and power generation industries. Additionally, they are employed in offshore and marine engineering, where the ability to withstand saline conditions is essential. B8 fasteners are perfect for a variety of industrial applications because they function well in both high-temperature and cryogenic environments. Their application in flanged joints, equipment fabrication, and structural assemblies demonstrates their adaptability and reliability in demanding engineering settings.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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