PTFE Coated Bolts are premium high-performance fasteners designed for extreme chemical and high-temperature environments. By applying a Polytetrafluoroethylene (PTFE) coating-such as Xylan or similar fluoropolymer finishes-to high-strength bolts, Shanxi Xinshunda Flange Manufacturing Co., Ltd. provides an exceptional barrier against corrosion, along with a low-friction surface that ensures precise torque control. These bolts are engineered to meet rigorous international standards (ASTM, DIN, ISO) and are available with full material traceability and test certifications upon request.
Production Details
Our ASTM A193 bolts are produced using state-of-the-art CNC machinery to ensure every thread and hexagonal head meets precise engineering drawings. The raw materials undergo strict chemical composition analysis before entering the production line. Each fastener is subjected to rigorous surface inspection to ensure the absence of defects such as cracks, laps, or improper coating. The dimensional accuracy is verified using advanced measuring instruments, ensuring a perfect match with your mating flanges.
Product Properties and Application
Product Properties
Outstanding Corrosion Resistance: The PTFE layer acts as an inert shield, protecting the substrate from acids, alkalis, and salt spray (tested up to 1,000+ hours in salt spray chambers).
Low Friction & Controlled Torque: Significantly reduces the nut factor (K-factor), allowing for more accurate and consistent clamp load during tightening.
High Temperature Stability: Maintains structural integrity and anti-galling properties in continuous temperatures ranging from -200°C to +260°C (-328°F to +500°F).
Anti-Galling & Non-Stick: Prevents seizing and thread damage, ensuring easy disassembly even after prolonged exposure to harsh conditions.
Application
PTFE Coated Bolts are critically important in highly corrosive and demanding industrial sectors. They are extensively used in Offshore Oil & Gas Platforms, Chemical Processing Plants, Petrochemical Refineries, Desalination Plants, and Marine Engineering. Additionally, they are ideal for Pulp & Paper mills and any application requiring both high strength and superior chemical resistance.
|
Parameter |
Specification |
|
Standard |
ASTM A193 (B7, B7M, B8), ASTM A320 (L7), DIN 931, DIN 933, ISO 4014, ISO 4017 |
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Product Type |
Hex Bolt, Heavy Hex Bolt, Stud Bolt, Anchor Bolt |
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Material |
Carbon Steel, Alloy Steel, Stainless Steel (304/316) |
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Property Class / Grade |
Grade 4.8, 8.8, 10.9, 12.9 / ASTM A193 B7, L7 |
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Size Range |
1/4" to 4" (Metric M6 to M100) |
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Length |
10mm to 500mm (or customized per drawing) |
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Thread Type |
UNC (Coarse), UNF (Fine), Metric (MM) |
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Coating Type |
PTFE (Polytetrafluoroethylene) / Xylan Coating |
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Coating Thickness |
20 μm - 40 μm (Standard), up to 80 μm available |
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Packing |
Plywood Cases, Wooden Pallets, or Custom Export Packaging |
Physical Properties
|
Property |
Value |
|
Tensile Strength |
800 MPa - 1200 MPa (depending on material grade) |
|
Yield Strength |
640 MPa - 1080 MPa |
|
Operating Temperature |
-200°C to +260°C (-328°F to +500°F) |
|
Friction Coefficient (Nut Factor) |
0.10 - 0.14 (Significantly lower than zinc or plain steel) |
|
Salt Spray Resistance |
> 1,000 Hours (ASTM B117) |
QA & QC
Shanxi Xinshunda implements a comprehensive Quality Assurance protocol for all PTFE coated fasteners. Our QC process includes verification of the base material's mechanical properties, precise dimensional inspections, and rigorous coating quality checks. We measure coating thickness using magnetic gauges and perform adhesion tests (cross-hatch) to ensure durability. Every shipment is accompanied by a Mill Test Certificate (EN 10204 3.1) and a Coating Inspection Report.
Packing, Storage, Handling and Transportation
To preserve the integrity of the PTFE coating, these bolts are individually inspected and carefully packaged in sturdy plywood cases or on wooden pallets. We use protective layering between rows to prevent inter-thread friction during transit. Each package is clearly labeled with the part number, size, grade, coating specification, and batch number. Store in a cool, dry place away from direct sunlight and sharp objects to prevent coating puncture or abrasion.
Strategic Partners with Shanxi Xinshunda
With over 15 years of manufacturing expertise, Shanxi Xinshunda Flange Manufacturing Co., Ltd. has proudly served 3,800+ global customers across 70+ countries. We are dedicated to delivering high-specification industrial flanges and fasteners, ensuring your projects in the energy, marine, and chemical sectors are built on a foundation of reliability and excellence.
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