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Wenzhou Heavy Hex Bolt
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Product: Wenzhou Heavy Hex Bolt
Material: A193 Gr.B8M Cl.2, 316SS
Dimension: 1 IN
Thread: 8 UNC
Length: 75 mm
Standard: ANSI B18.2.1
Thread Class: 2A
Material: A193 Gr.B8M Cl.2, 316SS
Dimension: 1 IN
Thread: 8 UNC
Length: 75 mm
Standard: ANSI B18.2.1
Thread Class: 2A
Quantity
Our Heavy Hex Bolt is a high-strength, corrosion-resistant fastening solution precision-engineered for critical industrial applications. Manufactured from premium 316 stainless steel and certified to ASTM A193 Gr.B8M Class 2, this bolt delivers exceptional mechanical properties and superior resistance to pitting, crevice corrosion, and stress corrosion cracking – even in chloride-rich and marine environments.
With a nominal size of 1 inch and a coarse thread pitch of 8 UNC, this bolt provides robust engagement and high load-carrying capacity. The 75 mm overall length ensures adequate grip for medium-to-heavy section connections, while the Thread Class 2A external thread tolerance guarantees smooth assembly with standard mating parts and reduces the risk of galling – a common concern with stainless steel fasteners.
Fully compliant with ANSI B18.2.1 dimensional standards, our heavy hex bolt features the larger head geometry characteristic of the heavy hex series, offering increased bearing surface and wrenching area. This design reduces indentation on soft materials and allows for higher torque application without stripping, making it ideal for pressure vessels, flanged connections, and structural steel joints.
Material & Performance Advantages
- A193 Gr.B8M Cl.2 – This grade is the molybdenum-bearing version of 304 stainless, offering enhanced creep resistance and tensile strength at elevated temperatures (up to 800°F / 427°C). Class 2 denotes strain-hardened condition with minimum tensile strength of 95 ksi, ensuring reliability under cyclic loading.
- 316SS composition – The addition of 2–3% molybdenum significantly improves pitting resistance equivalent number (PREN), outperforming conventional 304/304L in acidic and coastal exposures.
- **Corrosion protection** – The bolt’s passive oxide layer self-repairs, eliminating the need for additional coatings and reducing long-term maintenance costs.
- A193 Gr.B8M Cl.2 – This grade is the molybdenum-bearing version of 304 stainless, offering enhanced creep resistance and tensile strength at elevated temperatures (up to 800°F / 427°C). Class 2 denotes strain-hardened condition with minimum tensile strength of 95 ksi, ensuring reliability under cyclic loading.
- 316SS composition – The addition of 2–3% molybdenum significantly improves pitting resistance equivalent number (PREN), outperforming conventional 304/304L in acidic and coastal exposures.
- **Corrosion protection** – The bolt’s passive oxide layer self-repairs, eliminating the need for additional coatings and reducing long-term maintenance costs.
Typical Applications
This heavy hex bolt is specified in:
- Chemical and petrochemical plants – flanges, heat exchangers, and reactor nozzles.
- Marine and offshore structures – deck connections, subsea equipment, and seawater piping.
- Wastewater treatment facilities – where H₂S and chloride attack are prevalent.
- Food and pharmaceutical processing – due to 316SS’s easy sanitization and non-toxic surface.
- High-temperature steam lines and pressure-retaining systems requiring Code-compliant fasteners.
This heavy hex bolt is specified in:
- Chemical and petrochemical plants – flanges, heat exchangers, and reactor nozzles.
- Marine and offshore structures – deck connections, subsea equipment, and seawater piping.
- Wastewater treatment facilities – where H₂S and chloride attack are prevalent.
- Food and pharmaceutical processing – due to 316SS’s easy sanitization and non-toxic surface.
- High-temperature steam lines and pressure-retaining systems requiring Code-compliant fasteners.
Why Choose Our Heavy Hex Bolt?
- Dimensional precision – ANSI B18.2.1 ensures interchangeability with all standard heavy hex nuts and washers.
- Traceability – Each lot is supplied with mill test reports confirming chemistry, tensile, and hardness.
- Tool-friendly assembly – Class 2A threads reduce friction, allowing consistent torque control and reuse capability.
- Dimensional precision – ANSI B18.2.1 ensures interchangeability with all standard heavy hex nuts and washers.
- Traceability – Each lot is supplied with mill test reports confirming chemistry, tensile, and hardness.
- Tool-friendly assembly – Class 2A threads reduce friction, allowing consistent torque control and reuse capability.
Whether you are designing new equipment or maintaining existing assets, our Heavy Hex Bolt in 316SS/A193 Gr.B8M Cl.2 delivers the durability, safety, and performance that engineers demand. Stocked in Wenzhou with fast global dispatch – contact us for custom lengths or special markings.
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