Precision Fastener Manufacturer
For Corrosive & Severe Environments
DUROX INDUSTRIAL manufactures high-spec stud bolts, heavy hex bolts, and custom alloy fasteners (B7, L7, Inconel, Duplex). Featuring Whitford® Xylan®, Zn-Ni, and Sheradizing surface treatments tested up to 5,000+ hours salt spray resistance.
Core Products & Material Range
Manufactured to strict global standards for oil & gas offshore, subsea pipelines, petrochemical refining, and heavy steel structures.
Stud Bolts & Threaded Rods
Full-thread & double-end studs in Gr. B7, B7M, L7, L7M, B16, and A453 Gr.660. High-pressure flange connection ready.
Heavy Hex Bolts & Nuts
Structural bolts, A325, A490, A194 2H/7M heavy nuts. API 20E BSL-1, BSL-2, and BSL-3 certified manufacturing lines.
Duplex & Inconel Alloys
Super Duplex S32750/S32760, S31803, Inconel 625/718, Monel 400, and Titanium for extreme chemical/marine exposure.
U-Bolts & Non-Standard Parts
Pipe clamp sets, insulation clamps, welded studs, anchor bolts, and custom engineered fasteners produced to client drawings.
Engineered for Critical Global Sectors
Coating Technology & Salt Spray Performance Matrix
As a Whitford® Approved Coater (OAC), DUROX combines advanced base treatments (Sheradizing, Zn-Ni, Phosphate) with Whitford Xylan® 1000/1400 fluoropolymer series for extreme anti-galling and corrosion life.
| Coating System (Item) | Thickness (μm) | Salt Spray (ASTM B117) | Hydrogen Embrittlement | Thread Fit Impact | Adhesion Grade | Price / Cost Level |
|---|---|---|---|---|---|---|
| Zn-Ni Plating + Xylan® 1424 | 23 ~ 38 μm | 5,000+ Hours | None (Controlled) | Minimal / Precise | Excellent | Premium Value |
| Sheradizing (Zinc Infusion) | 15 ~ 85 μm | 5,000 Hours | None (Zero Risk) | Uniform / Perfect | Diffusion Bonded | Highly Economical |
| Xylar® 2 + Xylan® 1070 | 35 ~ 55 μm | 5,000 Hours | None | Minimal | Excellent | High Spec |
| Electro-Zinc + Xylan® 1424 | 23 ~ 38 μm | 2,500 Hours | Controlled Bake | Minimal | Good | Moderate |
| Hot Dip Galvanizing (HDG) | 45 ~ 120 μm | 2,500 Hours | Potential Risk | Large (Requires Over-tap) | Good | Low Cost |
| Standard Zinc Plating | 8 ~ 13 μm | 96 Hours | High Risk if unbaked | Minimal | Good | Cheap |
Advanced Robotics & SPC Controlled Quality
DUROX operates an 8,000 m² modern manufacturing hub equipped with robotic Xylan spraying lines, hydraulic hot-forging presses, multi-purpose heat treatment furnaces, and automated thread rolling machinery.
Robotic Spraying & Curing Lines
Automated continuous ovens & Zahn viscosity control ensure uniform dry film thickness (DFT) without drips.
Hydraulic Hot-Forging & Quenching
Solutizing & quench-temper furnaces ensure consistent grain structure and impact resistance at -101°C.
100% Inspection & Torque-Tension SPC
Every lot is checked for thread fit, hardness (Rockwell/Brinell), coating adhesion, PT/MT, and salt spray performance.
Certificates & Inspection Compliance
ISO 9001 & 18001
System-certified manufacturing processes covering raw material tracing to final shipping.
API 20E BSL 1-3
Full compliance for alloy and carbon steel bolting for oil and gas equipment standard.
Whitford OAC Approved
Licensed worldwide applicator for Whitford Xylan® 1000 & 1400 fluoropolymer series.
EN 10204 3.1 MTC
Complete chemical composition, mechanical property & impact test documentation supplied.
Global Engineering Case Proof
12,000 Sets A193 B7 Stud Bolts
Coated with Zinc Nickel + Whitford Xylan® 1424. Passed 5,000 hours salt spray audit without red rust. Delivered on schedule with 100% thread fit verification.
Duplex S32750 & L7M Bolts
Cryogenic impact tested at -101°C for extreme marine platform piping. Fully compliant with NORSOK M650 technical specification.
Sheradized U-Bolts & Pipe Clamps
50 metric tons of Sheradized (Zinc Infusion) pipe support hardware for acidic gas handling facilities, providing zero hydrogen embrittlement.
Get Direct Factory Pricing & Coating Selection Guide
Submit your fastener requirements to our engineering team. You will receive a direct manufacturer quotation within 2 business hours, along with our Fastener Coating & Material Selection Handbook (PDF).
What You Will Receive:
- Detailed Factory Quotation (FOB / CIF / DDP options)
- Complete Coating & Salt Spray Performance Manual (PDF)
- Free Physical Fastener & Coating Sample Pack (For qualified buyers)
Contact Us Directly
-
Email
[email protected] -
Phone / WhatsApp
+86 189 6933 0553 -
Factory Address
Fastener Industrial Park, Jiaxing,
Zhejiang, China 314300
Request Fastener Quote
Submit your fastener specifications, material grades, and drawings for instant technical evaluation and factory quote within 2 business hours.