Description
Threaded Steel Pipe Flanges (also known as Screwed Pipe Flanges) are specialized forged pipe connectors featuring internal taper threads (NPT or BSPT) that join seamlessly to externally threaded pipes without the need for zero-gap welding. These screwed flanges provide compact, pressure-tight sealing in non-welded piping systems, zero-heat hazard zones, and high-pressure small-bore pipeline assemblies.
Engineered strictly to international standard dimensions, our threaded steel flanges match perfectly with our industrial butterfly valves and form reliable flow control setups across our industrial flanges production lines.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Nominal Size Range | 1/2" to 24" (DN15 to DN600); Most popular in 1/2" to 4" small-bore sizes |
| Pressure Class Ratings | Class 150, Class 300, Class 600, Class 900, Class 1500; PN10, PN16, PN25, PN40 |
| Thread Types Available | NPT (ANSI/ASME B1.20.1), BSPT (ISO 7-1 / DIN 2999), BSPP (Parallel) |
| Material Grade Options | Carbon Steel (ASTM A105 / A350 LF2), Stainless Steel (304/304L, 316/316L), Alloy Steel (ASTM A182 F11/F22) |
| Flange Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Manufacturing Standards | ASME B16.5, EN 1092-1 Type 13, DIN 2565 / DIN 2566, JIS B2220 |
| Quality Control & Inspection | 100% Thread Gauge Inspection (Go/No-Go), Spectrometer PMI Test, EN 10204 3.1 MTR |
Key Features & No-Weld Advantages
Threaded steel pipe flanges offer crucial operational benefits in specific engineering environments:
- No Welding Required: Ideal for hazardous sites where open flames or welding heat are strictly prohibited, such as active gas stations, chemical refineries, and explosive atmospheres.
- Precision Internal CNC Threading: Machined with exact taper angles to ensure smooth thread engagement, leak-proof mechanical jointing, and long-term pressure retention.
- High Versatility & Reusability: Allows for quick disassembly during routine maintenance, line flushing, or piping modifications without cutting or grinding welds.
Target Applications & Industries
Our forged screwed steel flanges are widely used across diverse industrial supply systems:
- Gas & Fuel Distribution Systems: Gas utility lines, fuel gas piping, and oil transfer skids where no-weld joints are mandated.
- High-Pressure Small-Bore Piping: Hydraulic systems, instrument air lines, and high-pressure utility wash stations.
- Fire Protection & Commercial HVAC: Sprinkler networks and chilled water loops requiring fast mechanical pipe joining.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between NPT and BSPT threads on flanges?
NPT (National Pipe Taper) is the standard 60-degree thread type used primarily in North America, while BSPT (British Standard Pipe Taper) features a 55-degree thread angle commonly used in Europe, Asia, and Commonwealth countries.
Q2: Can a threaded flange be seal-welded after screwing?
Yes. In severe service or high-vibration applications, a seal weld can be applied around the pipe and flange hub junction after screwing to ensure absolute leak resistance.
Q3: Does Oucang Valve provide thread gauge testing for every batch?
Yes. Every threaded steel flange manufactured by Oucang Valve undergoes strict 100% thread gauge verification (Go/No-Go gauges) prior to surface coating and packing.
About the Manufacturer: Oucang Valve
Oucang Valve is an ISO-certified direct manufacturer specializing in heavy-duty forged steel pipe flanges, threaded/screwed flanges, and high-performance industrial valves. Operating our own ring forging shop, precision CNC threading centers, and physical/chemical testing lab, we supply EN 10204 3.1 material test certificates and custom OEM solutions for global B2B buyers.
- Core Capability: Forged threaded flanges, ASME B16.5 / EN 1092-1 compliance, NPT/BSPT precision threads, and fast export delivery.
- Quality Compliance: ASME B16.5, EN 1092-1, DIN 2566, JIS, and ISO standards.
- Factory Inquiry: Contact our technical sales team for direct factory quotations, thread inspection reports, and 2D/3D CAD drawings.
