Stud Bolts with Zinc-Nickel Plating and PTFE Coating Manufacturer
We manufacture and supply ASTM A193 Grade B7 stud bolts with advanced Zinc-Nickel plating and PTFE (polytetrafluoroethylene) coating, engineered for corrosive environments, high strength, and long-lasting performance in oil & gas, chemical, power generation, and offshore applications.
Product Overview
- Standard: ASTM A193 – Alloy Steel Bolting for High Temperature or High Pressure Service
- Grade: B7 – Chromium-molybdenum alloy steel
- Product Type: Stud Bolts (Double Ended Studs)
- Threads: UNC / UNF / Metric (as per ASME B1.1 / ISO standards)
- Nut Compatibility: ASTM A194 Grade 2H or Grade 7 (as required)
Surface Treatments
Zinc-Nickel Plating
- Alloy coating with ~12–18% Nickel content
- Superior corrosion resistance (>1000 hrs salt spray)
- Sacrificial protection to the base metal
- Uniform deposition, ideal for tight tolerance fits
PTFE Coating (e.g., Xylan®, Fluoropolymer)
- Low-friction surface for easy assembly and disassembly
- Chemically inert, resistant to acids, alkalis, and solvents
- Non-stick, water-repellent, anti-galling
- Enhances corrosion protection in marine, chemical, and subsea applications
Zinc-Nickel + PTFE system offers multi-layer protection: electrochemical barrier + polymer encapsulation
Typical Sizes Available
| Diameter | Length | Thread |
|---|---|---|
| M6 – M100 / ¼” – 4” | 25 mm – 2000 mm | Full / Partial Thread |
Custom sizes, non-standard lengths, and thread types available on request.
Applications
- Offshore platforms & FPSOs
- Subsea risers and wellheads
- Petrochemical reactors
- Power plants (turbine flanges, valves)
- Pipeline flange assemblies
- Corrosive gas environments (H₂S, CO₂)
Mechanical Properties of ASTM A193 B7
| Property | Value |
|---|---|
| Tensile Strength | ≥ 860 MPa (125 ksi) |
| Yield Strength | ≥ 725 MPa (105 ksi) |
| Hardness | ≤ 35 HRC |
| Elongation | ≥ 16% |
| Reduction of Area | ≥ 50% |
Meets ASME, NACE MR0175 / ISO 15156, and API 20E standards upon request.
Packaging & Documentation
- Packaging: Individual protection, boxed/crated, with anti-rust wrapping
- Marking: Grade, Heat Number, Coating Code (e.g., B7 ZN-PTFE)
- Certificates:
- EN 10204 3.1 MTC
- Coating Certificates (Thickness, Salt Spray Test)
- NDT Reports (if applicable)
- API / NACE compliance (optional)
