ASTM A193 Grade B8M bolt, AISI 316 grade stainless steel fasteners produced for harsh industrial environments where corrosion resistance is the most critical requirement. Unlike B8 quality, it shows excellent resistance to chloride environments, salt water and acidic solutions thanks to its Molybdenum content. It is generally preferred in offshore platforms, pulp mills and chemical tankers. In addition to the standard “Class 1” type, a cold work hardened “Class 2” option is available for projects requiring higher breaking strength. It is a technical requirement to be used as a set with ASTM A194 Grade 8M nuts for long life use.
| Feature | |
| Standard | ASME |
| Material | Stainless Steel |
| Type | Hexagon Head Stainless Bolt |
| Quality | ASTM A193 Grade B8M |
| Coating | It is generally uncoated. Special coatings such as PTFE or Moly Dry Film can be applied upon request. |
| Tooth Type | Metric Coarse Thread, Metric Fine Thread – UNC / UNF (Inch) |
| Measurement Range | M5 to M64, 1/2″-2 1/2″ |
| Production Method | Cold forging, hot forging, or machining |
| Thread Direction | Right-Hand Thread (standard) / Left-Hand Thread (upon request) |
- Offshore oil and gas platforms
- Maritime sector and shipyards (Places with salt water contact)
- Chemical processing plants (especially chloride-containing environments)
- Paper and pulp industry
- Waste water treatment plants
- ISO 9001:2015 Quality Management System
- ISO 14001:2015 Environmental Management System
- ISO 45001:2018 Occupational Health and Safety Management System
- EU Declaration of Conformity (PED) certificate (Compliance with the Pressure Equipment Directive)
- Our production processes, DIN, EN, ISO, and ASTM is fully compliant with the standards
- Upon request EN 10204 3.1 certificate is provided
The most important difference is the element Molybdenum. Thanks to this element, B8M is much more resistant to salt water, chlorides and aggressive acids than B8. If the project is by the sea or if there is chemical contact, B8M should be preferred.
For technical compatibility ASTM A194 Grade 8M nut should be used. If Grade 8 (304) nut is used, corrosion resistance decreases, if carbon steel (2H) nut is used, rusting starts.
Although ASTM A193 B8M technically maintains its structural integrity up to 800°C, under continuous load 538°C (1000°F) not recommended for use at temperatures above 500°C. In particular, Class 2 products may lose their hardness at temperatures above 500°C and revert back to Class 1. For very high temperatures, B8 (304) grade can sometimes be a more stable option.
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