ASTM A194 2H Teflon Coated Nuts: engineered for extreme conditions

In industries where high pressure, temperature, and corrosive media are everyday challenges, the integrity of fastening components is non-negotiable. The ASTM A194 2H Teflon Coated Nut stands out as a premium solution, combining the mechanical strength of Grade 2H heavy hex nuts with the exceptional chemical resistance of a Teflon (PTFE) coating.

This article explores the features, benefits, and ideal applications of these specialized nuts to help you determine if they’re the right fit for your project.

What Are ASTM A194 2H Teflon Coated Nuts?

ASTM A194 Grade 2H nuts are heavy hex nuts designed for high-pressure and high-temperature service, typically used with ASTM A193 B7, B16, or other high-strength bolts. When coated with Teflon (Polytetrafluoroethylene or PTFE), these nuts gain a non-stick, low-friction, and highly corrosion-resistant surface.

The result is a fastener that maintains clamp load under extreme conditions while resisting chemical attack and galling.

Key Features & Advantages

1. Superior Corrosion Resistance

Teflon coating provides an impermeable barrier against a wide range of chemicals, including acids, alkalis, and solvents. This makes these nuts ideal for:

• Chemical processing plants

• Offshore and marine applications

• Oil and gas pipelines

• Water treatment facilities

2. High-Temperature Performance

ASTM A194 2H nuts are suitable for temperatures from -58°F to 1000°F (-50°C to 540°C). The Teflon coating remains stable up to 500°F (260°C), ensuring reliable performance in heated processes.

3. Anti-Galling & Easy Installation

The PTFE layer reduces friction during tightening, preventing thread galling and ensuring smooth installation and disassembly—even after prolonged service.

4. Meets Industry Standards

These nuts comply with ASTM A194 Grade 2H mechanical properties and are often used in ASME-coded pressure vessel and piping systems.

Typical Applications

• Flange Connections in Aggressive Environments: Refineries, chemical reactors

• High-Pressure Steam Systems: Power generation, thermal plants

• Marine & Offshore Equipment: Saltwater-resistant bolting assemblies

• Food & Pharmaceutical Processing: Where non-contamination and cleanability are required

Why Choose ASTM A194 2H Teflon Coated Nuts?

By selecting these nuts, you benefit from:

• Extended service life in corrosive settings

• Reduced maintenance and replacement costs

• Reliable performance under high cyclic loads

• Compliance with international standards for safety-critical applications