Zhejiang Chengjiu Pipeline Co., Ltd. is one of the most reliable manufacturers and suppliers of stainless steel lap joint flange in China, also supports customized service. Please feel free to buy high quality stainless steel lap joint flange from our factory. Good service and reasonable price are available.
Product Introduction
Stainless Steel Lap Joint Flange supplied by CNCJ is a two-component assembly consisting of a loose backing ring (the flange itself) and a stub end, where the backing ring slides freely over the pipe and rotates around the stub end to allow bolt hole alignment without rotating the pipe or stub end. This rotating design makes lap joint flanges especially practical for pipelines that require frequent disassembly, systems with pre-welded stub ends that cannot be repositioned, and installations where bolt hole alignment is difficult to achieve with fixed flanges.
Product Description
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Stainless Steel Lap Joint Flange |
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Material |
SS304, SS316, SS304L, SS316L, SS321, SS310 ,1.4401, 1.4403 |
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Type |
Lap Joint |
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Class |
PN6 PN10 PN16 PN25 PN40 PN63 |
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Standard |
BS4505, GOST12820-80, DIN, UNI, EN1092-1 TYPE 02, SABS/SANS, AS, ISO, API, BS Tables D,E, F and H etc |
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Size |
1/2"NB to 48"NB |
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Connection |
FF |
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Application |
For Water, Oil and Gas Industrial |
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Certificate |
CE / ISO / SGS |
Key Features
Rotating backing ring allows full 360° rotation around the stub end, eliminating bolt hole misalignment problems during installation and reassembly.
Available in a broad stainless steel material range: standard austenitic grades (SS304, SS316, SS304L, SS316L, SS321, SS310) and duplex grades (2205, 2507, 254SMO) for high-corrosion or high-pressure applications.
Flat face (FF) sealing surface compatible with stub end facing, suitable for low-pressure and non-ferrous piping systems where raised face contact could damage soft mating flanges.
Wide pressure class coverage from PN6 to PN63, produced to multiple international standards including EN 1092-1, DIN, GOST 12820-80, BS 4504, and API.
Full size range from ½" NB to 48" NB, covering instrumentation branch connections through large-diameter pipeline applications.
CE, ISO, and SGS certified; EN 10204 3.1 material test certificates available upon request.
Application Scenarios
The rotating backing ring design of the lap joint flange makes it the preferred choice in systems where bolt hole alignment is a recurring challenge and where frequent disassembly for inspection or maintenance is part of normal operation. Typical applications include:
Chemical processing
Pipelines carrying corrosive media where sections must be opened regularly for cleaning, inspection, or catalyst changeover, and where duplex or SS316L stub ends are welded in place permanently while only the backing ring is removed.
Water treatment and municipal infrastructure
Large-diameter distribution and treatment headers where PN6 to PN16 lap joint flanges are used with stub ends on pipe materials that cannot be easily re-welded in the field.
Petroleum and natural gas
Branch connections on manifolds and process lines where pre-assembled stub ends are fixed and bolt hole alignment cannot be guaranteed without a rotating flange.
Shipbuilding and marine engineering
Fuel, ballast, and cooling water circuits where stainless steel lap joint flanges are used for ease of disassembly during drydock maintenance.
Power generation
Cooling water and auxiliary piping systems where duplex or SS316L grades are specified for corrosion resistance and the lap joint configuration reduces maintenance downtime.
Paper and pulp manufacturing
Process chemical lines where SS316L or 254SMO stub ends are required for media compatibility and the backing ring can be reused across multiple maintenance cycles.
OEM and Custom Orders
CNCJ accepts custom requirements for lap joint flanges outside standard specifications. Custom options include non-standard pressure classes, intermediate sizes, alternative stainless steel or duplex grades, special facing finishes on the stub end, and project-specific documentation packages. Third-party inspection by SGS, Bureau Veritas, TÜV, or Lloyd's Register can be arranged. Submit your drawing or specification sheet for feasibility confirmation and quotation.
Why Choose CNCJ
Zhejiang Chengjiu Pipeline Co., Ltd. (CNCJ) was established in 2012 in Quzhou, Zhejiang Province, with a 13,000 m² manufacturing facility operating more than 120 CNC and NC machines. We hold ISO 9001:2015, ISO 14001, and ISO 45001 certifications, and our product range covers flanges from DN10 to DN5000 across all major international standards including ANSI B16.5, EN 1092-1, DIN, GOST, JIS B2220, AS2129, AS4087, AWWA C207, MSS SP-44, and SABS/SANS 1123. CNCJ exports to more than 30 countries, with Ningbo and Shanghai as the nearest export ports.
13,000 m² facility, 120+ CNC and NC machines
In-house forging workshop, full material traceability from billet to finished product
CE / ISO / SGS certified; EN 10204 3.1 MTC available upon request
Multiple stainless steel and duplex grades in stock
FAQ
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