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ANSI B18.2.1 Hex Head Cap Screw
QS Fastener: ANSI B18.2.1 Hex Head Cap Screw
Name: ANSI B18.2.1 Hex Head Cap Screw
Material: ASTM A193 B8M Class 2 SS316
Size: 1-1/8 Inch
Length: 4.25 Inch
Thread: 8 UN Class 2A
Feature: Fully Thread Hex Bolt
Material: ASTM A193 B8M Class 2 SS316
Size: 1-1/8 Inch
Length: 4.25 Inch
Thread: 8 UN Class 2A
Feature: Fully Thread Hex Bolt
Quantity
The ANSI B18.2.1 Hex Head Cap Screw serves as a critical connecting component in industrial applications. Manufactured from premium SS316 stainless steel with dimensions of 1-1/8"×4.25"and precision 8 UN Class 2A threading, it fully complies with ANSI standards. Featuring a fully-threaded design and exceptional corrosion resistance, the ANSI B18.2.1 Hex Head Cap Screw has become the preferred solution for demanding environments including chemical plants and marine applications.
Core Advantages of ANSI B18.2.1 Hex Head Cap Screw
1. Material Performance
The ANSI B18.2.1 Hex Head Cap Screw utilizes UNS S31600 stainless steel, with corrosion resistance derived from optimized alloy composition (Cr, Ni, Mo) and stable austenitic structure. Its Pitting Resistance Equivalent Number (PREN) of 24.5 significantly exceeds conventional stainless steel standards.
1. Material Performance
The ANSI B18.2.1 Hex Head Cap Screw utilizes UNS S31600 stainless steel, with corrosion resistance derived from optimized alloy composition (Cr, Ni, Mo) and stable austenitic structure. Its Pitting Resistance Equivalent Number (PREN) of 24.5 significantly exceeds conventional stainless steel standards.
2. Corrosion Resistance Testing
The ANSI B18.2.1 Hex Head Cap Screw passes ASTM G48 Method A testing with Critical Pitting Temperature ≥25°C. In 3.5% NaCl solution, it demonstrates an annual corrosion rate <0.002 mm/a, making it particularly suitable for chloride-rich environments like offshore platforms.
The ANSI B18.2.1 Hex Head Cap Screw passes ASTM G48 Method A testing with Critical Pitting Temperature ≥25°C. In 3.5% NaCl solution, it demonstrates an annual corrosion rate <0.002 mm/a, making it particularly suitable for chloride-rich environments like offshore platforms.
3. Special Environment Suitability
Certified to NACE MR0175 standards, the ANSI B18.2.1 Hex Head Cap Screw is safe for use in H₂S/CO₂-containing oil and gas environments. It shows excellent chloride stress corrosion cracking resistance with time-to-failure >500h in boiling 42% MgCl₂ solution.
Certified to NACE MR0175 standards, the ANSI B18.2.1 Hex Head Cap Screw is safe for use in H₂S/CO₂-containing oil and gas environments. It shows excellent chloride stress corrosion cracking resistance with time-to-failure >500h in boiling 42% MgCl₂ solution.
Technical Parameters of ANSI B18.2.1 Hex Head Cap Screw
- Size range: 1-1/8"×4.25"(custom sizes available)
- Thread standard: 8 UN Class 2A
- Material certification: ASTM A193 B8M Class 2
- Surface treatment: Pickling & passivation or electropolishing
- Size range: 1-1/8"×4.25"(custom sizes available)
- Thread standard: 8 UN Class 2A
- Material certification: ASTM A193 B8M Class 2
- Surface treatment: Pickling & passivation or electropolishing
Application Fields of ANSI B18.2.1 Hex Head Cap Screw
This Screw is particularly suitable for:
- Seawater desalination equipment connections
- Chemical reactor flange fastening
- Offshore platform structural assembly
- Critical oil/gas pipeline connections
This Screw is particularly suitable for:
- Seawater desalination equipment connections
- Chemical reactor flange fastening
- Offshore platform structural assembly
- Critical oil/gas pipeline connections
Why Choose ANSI B18.2.1 Hex Head Cap Screw?
1. Standardized design: Strict compliance with ANSI B18.2.1 requirements
2. High-strength connection: Fully-threaded design ensures even stress distribution
3. Long-term reliability: 316 stainless steel guarantees durability in harsh environments
4. Custom flexibility: Special specifications available per customer requirements
1. Standardized design: Strict compliance with ANSI B18.2.1 requirements
2. High-strength connection: Fully-threaded design ensures even stress distribution
3. Long-term reliability: 316 stainless steel guarantees durability in harsh environments
4. Custom flexibility: Special specifications available per customer requirements
With its outstanding performance and proven reliability, the ANSI B18.2.1 Hex Head Cap Screw has become the preferred fastener solution for industrial equipment flanges and critical structural fastening. Whether standard or custom specifications, the Screw delivers perfect connection security.
For more technical details about ANSI B18.2.1 Hex Head Cap Screw or customization services, please contact our professional fastener engineering team.
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