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Product Name | Sanheng Hydraulic FL / FS SAE Split Flange Halves Code 61 62 Fittings |
Code | FL FS |
Material & Surface Treatment | Carbon steel (zinc plated Cr3+); Stainless steel (passivation) |
Application | Pipe connection（oil,water,gas） |
Technology | CNC machining & Forged |
Package | All adapters equipped with thread protective end caps, inside plastic bags, and then inside standard blank carton boxes. |
Our main products | Threaded hydraulic hose fittings and pipe adapters, sucn as Metric , BSP, BSPT, NPT , JIC , ORFS, SAE thread. |
The FL (Code 61) and FS (Code 62) SAE split flange halves are purpose-built to solve the most intractable challenges of large-diameter high-pressure fluid connection. Unlike traditional threaded fittings that struggle with high torque and disassembly difficulties in heavy-duty systems, the split-half design allows for rapid installation and maintenance without dismantling entire adjacent pipeline runs. Manufactured via high-pressure closed-die forging with multi-axis CNC precision machining, the flanges feature perfectly flat sealing faces and precisely aligned bolt holes, ensuring uniform clamping force across the entire joint. The optimized captive O-ring groove prevents seal extrusion under extreme pressure spikes, delivering a permanent leak-free connection for hydraulic oil, industrial water and compressed gases. Ideal for high-flow, high-stress applications, it drastically reduces maintenance downtime and eliminates the risk of catastrophic fluid spills in critical industrial infrastructure.
Manufactured in strict compliance with SAE J518 C and ISO 6162 international standards, all sealing face flatness and bolt hole position tolerances are controlled to micron-level precision. Carbon steel variants pass 96-hour neutral salt spray test with zero red rust, while stainless steel versions withstand over 500 hours of salt spray exposure. Complete dimensional drawings, bolt torque specifications and O-ring matching charts are available upon request, and all flanges are 100% interchangeable with equivalent products from global mainstream brands.
Maintenance-Friendly Split Design: Eliminates the need for full pipeline disassembly, cutting on-site maintenance time by 70% and reducing labor intensity in confined equipment spaces.
Uniform Clamping Force Distribution: Symmetric split-half structure ensures even torque application across the entire sealing face, preventing flange tilt and localized stress fractures that cause premature seal failure.
Anti-Extrusion O-Ring Groove: Precision-machined captive groove locks the O-ring in place, preventing seal extrusion under sudden pressure spikes up to 1.5 times the rated working pressure.
Superior Vibration Dampening: Dense forged body absorbs and dissipates harmonic vibrations from heavy machinery, maintaining tight clamping force over years of continuous operation without loosening.
Wide Temperature Range Stability: Operates reliably across -40°C to 200°C, maintaining structural integrity and sealing performance in both arctic outdoor environments and high-temperature industrial processing plants.
High-Flow Smooth Bore: Optimized internal transition geometry minimizes fluid turbulence and pressure loss, making it ideal for large-diameter high-flow hydraulic systems.
Carbon Steel (RoHS-Compliant Cr3+ Zinc Plated)
Adopts a high-adhesion trivalent chromium zinc plating process with coating adhesion exceeding ISO 2409 Class 1, providing excellent rust and oxidation resistance. It offers exceptional compressive strength and cost-effectiveness, making it ideal for general industrial hydraulic systems, construction machinery and indoor power unit applications.
Stainless Steel (Chemical Passivation)
Uses high-quality 304/316L stainless steel billets processed through a low-temperature nitric acid passivation treatment, which removes surface free iron and forms a dense, self-healing chromium oxide film. This enhances acid, alkali and salt spray corrosion resistance by 300% compared to untreated steel, perfectly suited for marine engineering, offshore oil & gas and chemical processing applications.
Large-Scale Hydraulic Power Units: Main oil line connections for 1000+ ton hydraulic presses, injection molding machines and central hydraulic power stations, handling massive flow rates under continuous high pressure.
Heavy Construction & Mining Equipment: Hydraulic system connections for large excavators, bulldozers and mining crushers, withstanding severe shock loads and continuous vibration in harsh outdoor environments.
Marine & Offshore Engineering: Stainless steel variants for ship propulsion systems, port cranes and offshore platform hydraulic lines, providing reliable corrosion resistance in salt spray and humid marine atmospheres.
Metallurgical & Steel Industry: High-temperature hydraulic line connections for steel rolling mills and continuous casting equipment, maintaining sealing performance under extreme thermal cycling conditions.
Wind Power & Renewable Energy: Pitch and yaw hydraulic system connections for wind turbines, with excellent fatigue resistance to withstand years of cyclic loading in remote, hard-to-access locations.
The flange blanks are formed in a single operation via 1600-ton closed-die forging, which aligns the metal grain flow along the flange contours to maximize compressive strength and impact resistance. All sealing faces are precision ground to a flatness of 0.02mm per 100mm, and bolt holes are drilled in a single setup to ensure position tolerance ≤±0.1mm. Each batch undergoes 100% dimensional inspection, hydraulic pressure sealing test and coating adhesion test before delivery to guarantee zero defects.
Review these common inquiries to better understand our operational capabilities and product specifications.
Are you a direct manufacturer of these hydraulic fittings?
Yes, our facility in Ningbo, Zhejiang Province, specializes entirely in the design and production of premium hose connectors, transition joints, and split flange halves.
How do you handle sample requests for quality evaluation?
We welcome sample orders to allow you to test and verify our quality firsthand. Samples are provided at a minimal, reasonable charge, with freight costs handled by the recipient. Mixed sample batches are fully acceptable.
What is the standard lead time for large-scale production?
For conventional, in-stock products, we can dispatch small batches immediately. For standard bulk orders, our typical production cycle is approximately 30 days. Custom designs or multi-part assemblies will require a tailored timeline.
Do you impose Minimum Order Quantity (MOQ) restrictions?
We offer maximum flexibility. If the required items are currently in our inventory, there is absolutely no MOQ. MOQs are only applied to out-of-stock items or specialized custom production runs.
Can these flanges be customized with our proprietary branding?
Absolutely. We provide comprehensive OEM/ODM services and support precise laser marking, allowing you to permanently etch your brand logo or specific part numbers onto the fittings.
What payment structures do you support for international orders?
Our standard and preferred payment term for global transactions is T/T (Telegraphic Transfer), ensuring secure and efficient financial processing.
