GOST TYPE 04 flange is a flat loose steel flange on a welding collar defined in GOST 33259-2015. It is a rotatable loose flange used with a matching welding collar, widely applied in pipelines that require frequent disassembly, maintenance, or alignment adjustment. Our TYPE 04 flanges are precisely machined to ensure smooth rotation, perfect fit, and reliable sealing.
Production Details
Each GOST TYPE 04 flange is manufactured under strict quality control:
Raw material inspection with mill certificates and spectral analysis
Precision plate cutting or forging per GOST standard
CNC machining for accurate dimensions, bolt holes, and facing
100% dimensional inspection using calibrated gauges and CMM
Visual inspection for surface defects and finish
Anti-corrosion oil coating and permanent marking
Full material traceability from raw material to finished product
Product Feature and Application
Key Features
- Fully compliant with GOST 33259-2015 standard dimensions
- Loose and rotatable structure for easy bolt hole alignment
- Suitable for frequent disassembly and maintenance
- High precision and good interchangeability
- Smooth welding surface for strong connection
- Ideal for stainless steel and corrosion-resistant pipelines
- Low installation difficulty and high efficiency
Typical Applications
- Piping systems requiring frequent assembly and disassembly
- Stainless steel and corrosion-resistant fluid pipelines
- Chemical, food, pharmaceutical, and water treatment industries
- Utility, HVAC, and auxiliary engineering systems
- Russian, CIS, and Eastern European standard projects
| Standard | GOST 33259-2015, TYPE 04 |
| Pressure Rating | PN 6, PN 10, PN 16, PN 25 |
| Nominal Diameter | DN 10 – DN 1200 |
| Type | Loose Flange with Welding Collar |
| Face Type | Type A (Flat Face FF), Type B (Raised Face RF) |
| Materials | Carbon steel St20, St3sp; Stainless steel 12Х18Н10Т, 10Х17Н13М2Т |
| Working Temperature | −20 °C – 300 °C |
| Certification | EN 10204 3.1 Material Test Certificate |
Production Display
Our ISO 9001 certified factory is equipped with advanced forging lines, heavy-duty CNC machining centers and professional testing laboratories. Full production process is traceable. Third-party inspection by SGS, BV, TÜV is available upon request.
Product Transport Package
- Surface treatment: Anti-corrosion oil, black paint or varnish
- Packaging: Plastic film, woven bag, export wooden case, steel pallet
- Labeling: Size, pressure, material, standard, heat number, batch
- Documents: Commercial invoice, packing list, certificate of origin, material test certificate
- Transportation: Sea, land and express delivery to global markets
After-sales Service
We provide full life-cycle technical support for GOST TYPE 04 flanges:
- Professional consultation on selection, welding and installation
- Custom sizes, materials and drilling per customer drawings
- Timely response to after-sales inquiries and quality claims
- Remote technical guidance and on-site support
- Stable long-term supply for large-scale projects
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