Slip-On Flanges (SO) are among the most versatile and cost-effective connection components in modern industrial piping. At Jiangyin Zhonghai Precision Machinery Co., Ltd., our SO flanges are engineered with a precision-bored inner diameter slightly larger than the pipe's outer diameter, allowing the pipe to slide directly into the flange for secure double-fillet welding.

Backed by our fully integrated in-house forging, heat treatment, and CNC machining lines, Zhonghai produces slip-on flanges that transcend industry standards. We offer exceptional structural integrity for extreme dimensions (up to 4 meters) and high-pressure ratings (up to 2500 lbs). From mass-produced standard components to complex bespoke parts based on your blueprints, we provide optimized solutions from material evaluation to final delivery.

Core Advantages
·Vertically Integrated Manufacturing: Our full control over forging, machining, and testing eliminates quality fluctuations from outsourcing, ensuring superior grain flow and material density.
·Global Certification Compliance: ISO 9001 certified with PED (Pressure Equipment Directive) and TS qualifications, meeting the rigorous safety requirements of international markets.
·Large-Scale Capability: We support a wide range from 1/2" to 60", with a single-component weight capacity of up to 10 tons and a maximum diameter of 4 meters.
·Agile Customization: We offer a "Blueprint-to-Quote" service for non-standard parts, supporting everything from rapid prototyping to full-scale mass production.

Product Features
·Installation Efficiency: The slip-over design reduces the need for precision-cut pipe lengths and simplifies alignment, significantly cutting down on-site labor time.
·Exceptional Weldability: Using high-quality forged billets with strictly controlled carbon equivalents, our flanges ensure excellent compatibility and crack resistance during dual-surface welding.
·Precision-Machined Faces: High-precision CNC turning guarantees that RF, FF, or RTJ sealing surfaces meet exact roughness specifications for zero-leakage performance.
·High-Pressure Resilience: Moving beyond standard utility grades, Zhonghai's advanced forging techniques allow our SO flanges to sustain pressures up to 2500 lbs.

Application Scenarios
·Transmission Pipelines: Connections for low-to-medium pressure fluid transport systems and equipment.
·Pressure Vessels: Inlet and outlet interfaces for heat exchangers, storage tanks, and reactors.
·Marine & Offshore: Piping installations in space-constrained environments.
·Power & Energy: Auxiliary circulating water systems, steam lines, and mechanical component matching.