Home >ASTM A193 B8 CL5 Bolts
Majid Fasteners is a reputed producer and distributor of high performance industrial fasteners in Dubai, UAE that deal with advanced ASTM A193 B8 Class 5 bolts. These bolts are ultra high-strength, highly resistant to corrosion and long life span and are engineered to suit the highest demands of the industrial requirements. We offer reliable fastening solutions to petrochemical, power generation, marine and high pressure loads with state of the art manufacturing facilities and stringent quality assurance. We are an excellent company and this is why we are a partner of choice in the region.
The ASTM A193 B8 Class 5 bolt is made from strain-hardened Stainless Steel Grade 304 and is designed to provide the greatest possible mechanical strength and corrosion resistance. The chemical makeup of these bolts is 18% to 20% chromium and 8% to 12% nickel, and the carbon content is carefully controlled to ensure maximum stability and durability.The strain hardening process used on Class 5 bolts results in an ultra-high yield and tensile strength compared to the other classes (Class 1 through Class 4) with Class 5 bolts attaining approximately 150 kpsi of tensile strength. These bolts have the highest hardness, thermal stability, and chemical attack resistance of all types of bolts, making them suitable for use in highly aggressive environments and applications that require the highest pressures.
|
Material |
Specification |
Standards |
Size
|
Length |
|
ASTM A193 B8 CL5 Bolt
|
IS
BS
ASTM
|
DIN, ISO, JIS, GB, IS, BS, ASTM |
M 02 to M 160
|
3 mm to 200 mm
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| Element | B8 CL5 | B8 CL5 | B8M CL5 |
| 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 |
| B8 CL5 | 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 CL5 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL5 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL5 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 CL5 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 |
The bolts are ASTM A193 B8 Class 5 bolts applied in very demanding industrial conditions where the highest level of strength, corrosion resistance, and service life are the most important factors. The bolts are highly used in petrochemical industry, oil and gas refinery, high pressure piping systems, and refineries because of the high levels of mechanical performance. They suit perfect applications in acquiring pressure vessels, heat exchangers, boilers, reactors, flanges, and valves that require a high level of temperature and corrosive environment. In marine applications, offshore and power generation they are more dependable since their durability is enhanced. They are also applicable in the heavy industrial equipment that needs a high-quality fastening integrity.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
