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Contact Person: An Jihong
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Address: Jiangcun Industrial Park, Jiangcun Township, Dingxiang County, Xinzhou City
Threaded flange
A threaded flange is a type of flange that connects directly to a pipe via internal or external threads, eliminating the need for welding. It relies on thread engagement to achieve sealing and fastening.
- Product Description
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Basic Concepts and Structure
A threaded flange is a type of flange that connects directly to a pipe via internal or external threads, eliminating the need for welding and relying on thread engagement for sealing and fastening. Its structural features are as follows:
Thread Type: Commonly used American standard (NPT, National Pipe Thread), British standard (BSPT), or metric threads. Thread depth and tooth profile match the pipe interface according to the standard.
Material Selection: Carbon steel (such as Q235, 20#), stainless steel (304, 316), alloy steel (16Mn), etc., adaptable to different media and working conditions.
Core Product Features
Easy Installation, No Welding Required
Direct connection via threaded tightening, avoiding welding processes, saving on on-site welding equipment and labor costs, especially suitable for scenarios where welding is impossible (such as flammable and explosive environments, in-situ pipe maintenance).
Easy Disassembly, Convenient for Pipe Inspection or Part Replacement, Reusable.
Reliable Sealing Performance
Used with sealing materials (such as PTFE tape, metal wound gaskets), the thread engagement forms a mechanical seal, suitable for medium and low-pressure conditions (usually PN≤2.5MPa, depending on the standard and material).
Application Scope
Medium: Water, gas, oil, etc., non-corrosive media. Stainless steel material can be used for mildly corrosive media.
Pipe Diameter: Usually suitable for small-diameter pipes (DN15-DN100). Large-diameter threaded flanges are less commonly used due to the difficulty of thread processing and reduced sealing reliability.
Working Condition Limitations
Not suitable for high-pressure, high-temperature, or high-vibration environments (threaded connections are prone to stress loosening, increasing the risk of seal failure).
Requires high pipe concentricity; thread eccentricity may lead to poor sealing.
Comparison with Other Flange Types
Comparison Dimensions
Threaded Flange
Welding Flange (such as butt-welding flange)
Loose Flange
Connection Method
Thread engagement, no welding
Welding
Loose ring + welding or thread
Installation Difficulty
Low, no professional welding skills required
High, requires certified welders
Medium, requires control of the loose ring position
Sealing Reliability
Reliable in medium and low-pressure scenarios
Better for high-pressure and high-temperature scenarios
Suitable for corrosive media, sealing relies on gaskets
Cost
Lower (material and installation costs)
Higher (welding process and material costs)
Medium (loose structure costs higher)
Applicable Working Conditions
Small diameter, medium and low pressure, non-high temperature environment
High pressure, high temperature, large diameter pipes
Corrosive media, frequent disassembly scenarios
Application Areas
Wind Power Industry Shipbuilding Mechanical Manufacturing 
Nuclear Power Industry Oilfield Industry Chemical Industry
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Mobile Phone: +86-13603506135
Contact Person: An Jihong
Email:ah@ahflange.com
Address: Jiangcun Industrial Park, Jiangcun Township, Dingxiang County, Xinzhou City
