Plate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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Threaded Flange (TH)
NPT/BSP threaded bore flange — no welding required, ideal for low-pressure, frequently serviced lines.
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THSteel Pipe Flanges
Overview
Threaded Flange (TH) is a flange connected to the pipe by thread, without welding, which is convenient for disassembly and maintenance. It has the advantages of simple structure, quick installation, no damage to the pipe during installation, and is suitable for low-pressure, small-diameter pipeline systems and scenarios that require frequent disassembly. As a convenient and practical flange type, it is widely used in light industrial and civil pipeline systems and small-scale export projects worldwide.
Size Range
½" – 4" (DN15 – DN100)
Pressure Class
Class 150 – 300 / PN10 – PN25
Key Features
- No welding required — threaded connection reduces construction difficulty and protects the pipe
- Easy disassembly and maintenance for inspection and component replacement
- Simple structure and quick installation — compact, lightweight design
- Ideal for small-diameter systems (DN15 – DN100)
- Global standard compliance — ISO, ASME, DIN, EN, JIS and GB manufacturing
- Thread types: NPT (ANSI), BSP (British) and G (metric)
- Sealing surfaces: FF (Flat Face) and RF (Raised Face)
Benefits
- No hot work permit required for installation
- Reusable threaded connection for maintenance cycles
- Compatible with standard NPT, BSP and metric pipe threads
- Customized per customer drawings, materials and standards
Specifications
| Standards | ISO 7005, ASME B16.5, DIN 2501, EN 1092-1, JIS B2220, GB/T 9114, HG/T 20592, HG/T 20615 |
| Materials | Carbon steel (A105, 20#, Q235B), stainless steel (304, 316L), alloy steel (16Mn) — customizable per medium and conditions |
| Pressure Ratings | Class 150, 300 / PN10, PN16, PN25 |
| Nominal Diameter | DN15 – DN100 (NPS ½" – 4") |
| Thread Type | NPT (American Standard), BSP (British Standard), G (Metric) |
| Sealing Surface | FF (Flat Face), RF (Raised Face) |
| Working Temperature | -20°C – 300°C (special grades on request) |
Applications
Water supply and drainageHVAC and gas pipeline systemsLow-pressure chemical engineeringPharmaceutical and food & beverage processingSmall-scale industrial equipmentFrequently disassembled or maintained piping
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Standards
- • ISO 7005
- • ASME B16.5
- • DIN 2501
- • EN 1092-1
- • JIS B2220
- • GB/T 9114
- • HG/T 20592
- • HG/T 20615
Materials
- • Carbon Steel: A105, 20#, Q235B
- • Stainless Steel: 304, 316L
- • Alloy Steel: 16Mn
Related Products
Slip On Flange (SO)
Sleeve-type flange slipped over the pipe and fixed by fillet welding — economical for medium and low pressure systems.
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Lap Joint Flange (LJ)
Loose flange with stub end — convenient disassembly for large-diameter, low and medium pressure systems.
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