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Detailed Information
Threaded flange
Category:
We have obtained TÜV product certification and ISO 9001 quality management system certification, and has invested in state-of-the-art instrumentation and equipment specific to the industry, ensuring more scientific, standardized, and modern manufacturing processes.
Product Details
Threaded flange—simply screw it on; no welding required.
Threaded flanges (threaded flanges, Th flanges) feature internal NPT threads within the bore. Simply screw the pipe into the flange, install a gasket, and tighten the bolts to achieve a secure seal—no welding or hot work is required, making them particularly well suited for small-diameter piping or hazardous plant areas. As this connection method is mechanical in nature, threaded flanges are the preferred choice for explosive atmospheres, cryogenic discharge lines, and any application where sparks could have severe consequences.
Our available standard specifications
| Project | Typical range |
|
Nominal size |
½ inch – 4 inches (DN 15 – DN 100) |
|
Pressure rating |
150–2,500 pounds (PN 10–PN 400) |
|
Thread form |
NPT (ANSI B1.20.1), BSPP, and BSPT threads are available upon request. |
|
Sealing surface |
RF, FF, RTJ |
|
Materials |
A105, LF2, F304, F316L, F51 duplex stainless steel, and others. |
Why do operators choose threaded flanges?
Welding-free—eliminating ignition sources in hazardous (explosion-proof) areas
Quick installation—screw-fastened, with no post-weld heat treatment or NDT delays required.
Specialized manufacturer of small-bore fittings—forged in a single step, ranging from ½-inch NPT to 4-inch NPS.
Same specification—2,500 pounds, applicable to DN 50 and smaller sizes.
Reusable—unscrew for inspection and reseal with new tape.
Typical Services
Lubricant Control Console in Explosion-Proof Grade Buildings
Instrument air header at near-atmospheric pressure
Low-temperature discharge pipeline (-196°C, 304L short section)
Sampling points that require frequent sampling
High-purity gas panel (electrolytically polished internal bore, Ra ≤ 0.4 µm)
Quick Selection Guide
| Service | Pressure rating | Materials | Sealing surface |
| Instrument air | 150 | A105 | RF |
| Low-temperature exhaust port | 300 | F304L | FF |
| Sulfuric acid | 150 | F316L | RF |
| Hydrogen circulation | 600 | F51 | RTJ |
Shanxi Chengyu Forging Co., Ltd.
Integrated forging manufacturer specializing in flanges and forgings across carbon steel, stainless steel, and alloy steel — serving the global petroleum, chemical, wind power, and marine industries.
Company Profile
A premier forging enterprise with integrated, end-to-end production capabilities — from raw material sawing through to finished product packaging and shipment.
Integrated Production
State-of-the-art instrumentation and equipment ensure scientific, standardized, and modern manufacturing processes across every stage.
Precision raw material cutting and blank preparation
Ring rolling, open-die and closed-die forging processes
Normalizing, quenching, tempering, and solution treatment
CNC turning, milling, and drilling to precise tolerances
Full physicochemical analysis and dimensional inspection
Export-grade packaging and logistics coordination
Product Portfolio
A comprehensive range of flanges and forgings manufactured to international standards, with particular expertise in necked slip-on and necked socket-weld flanges.
- Ring forgings
- Flanges (including necked slip-on and necked socket-weld types)
- Flange covers
- Shafts
- Tube sheets
Specialty focus: extensive manufacturing capabilities and proven experience in producing necked slip-on and necked socket-weld flanges — a key competitive differentiator.
Material Grades
Conforming Standards
Quality & Certifications
Internationally recognized certifications underpin every product we deliver, ensuring consistent quality and global market acceptance.
TÜV Product Certification
Independent third-party verification of product quality and conformity
ISO 9001 Quality Management
Systematic quality management across all production processes
| Item | Details |
|---|---|
| Enterprise Rating | AAA+ |
| Certifications | TÜV Product Certification, ISO 9001 |
| Annual Capacity | 8,000 metric tons |
| Annual Revenue | RMB 100 million |
| Personnel | 125 employees |
Served Industries
Our products are trusted across critical infrastructure and heavy industry sectors worldwide.
Petroleum
Chemical
Wind Power
Pressure Vessels
Shipbuilding
Machinery Mfg.
Keywords:
Chengyu
Forging
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Jiulongwan Industrial Zone, Shacun Village, Dingxiang County, Xinzhou City, Shanxi Province
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