ASME B18.31.3 SA193 B7 / B7M / B16 Xylan 1424 PTFE Coated Stud Bolts
ASME B18.31.3 SA193 B7 / B7M / B16 Xylan 1424 PTFE Coated Stud Bolts & Hex Bolts | 18mm Stainless Steel Bolt and Nut
SSM manufactures and supplies a wide range of ASME B18.31.3-compliant Stud Bolts and Hex Bolts, including SA193 B7, B7M, and B16 grades, coated with Xylan 1424 or PTFE (Teflon) for superior corrosion protection and low friction performance.
These precision-engineered fasteners are widely used in oil & gas, petrochemical, offshore, and power plant applications where high strength and anti-corrosion performance are essential.
Product Overview
The ASME B18.31.3 Stud Bolt is a fully threaded fastener designed for use with two heavy hex nuts, commonly applied in flanged connections.
With PTFE / Xylan coating, these bolts exhibit excellent anti-galling, corrosion resistance, and lubricity, ensuring reliable tightening and long-term performance even in aggressive environments.
SSM's 18mm PTFE-coated Hex Bolts and Nuts provide the same quality performance for general structural, mechanical, and piping applications requiring clean, non-stick, and durable fastening solutions.
Material Grades and Coatings
| Grade | Standard | Typical Use | Features |
|---|---|---|---|
| SA193 B7 | ASTM A193 | High-temperature, high-pressure bolting | High tensile strength alloy steel |
| SA193 B7M | ASTM A193 | Sour service & offshore use | Tempered for improved ductility |
| SA193 B16 | ASTM A193 | Steam turbine & pressure vessel systems | High-temperature creep resistance |
| Stainless Steel (A2 / A4 / SS316 / SS304) | ASTM F593 | General corrosion resistance | Suitable for marine & chemical environments |
Coating Options:
Xylan 1424 Coating: Blue or green fluoropolymer coating providing anti-friction, anti-corrosion, and chemical resistance.
PTFE (Teflon) Coating: Non-stick surface reduces torque and prevents thread galling in stainless steel applications.
Technical Specifications
| Parameter | Description |
|---|---|
| Standard | ASME B18.31.3 / ASTM A193 / ASTM A194 |
| Grades | B7, B7M, B16, Stainless Steel (304, 316) |
| Diameter Range | M6 – M100 (includes 18mm) |
| Thread Type | Metric / UNC / UNF |
| Finish / Coating | Xylan 1424 / PTFE / Hot Dip Galvanized / Zinc Plated |
| Strength Class | 8.8 / 10.9 / 12.9 |
| Nuts | ASTM A194 2H / 8 / 8M Matching Nuts Available |
| Applications | Flange bolting, valve assembly, pressure vessels, structural joints |
Applications
Offshore & Marine Structures
Chemical & Petrochemical Plants
Water Desalination Systems
Oil & Gas Refineries
Power Generation and Steam Systems
Structural and Mechanical Installations
Advantages of SSM PTFE/Xylan-Coated Bolts
High corrosion and chemical resistance even in seawater and acid environments
Reduced torque & galling prevention during assembly
Extended service life due to advanced fluoropolymer coating
Precision-machined threads for accurate and secure fastening
Custom sizes, coatings, and grades available upon request
Conclusion
The ASME B18.31.3 SA193 B7 / B7M / B16 Stud Bolts and Hex Bolts with Xylan 1424 or PTFE coating from SSM provide unmatched reliability, corrosion protection, and mechanical strength.
Engineered for heavy-duty industrial service, these 18mm stainless steel bolts and nuts ensure optimal performance, safety, and longevity in even the most challenging environments.
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