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Product Name | Sanheng Hydraulic 3C / 3D Hydraulic Metric Female Tube Adapter with Swivel Nut |
Code | 3C 3D |
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 3C (light series) and 3D (heavy series) metric female tube adapters are purpose-built to solve the most intractable installation challenges in compact high-pressure hydraulic systems. Featuring an innovative integrated floating swivel nut design, it allows technicians to complete precise alignment in cramped manifold spaces without twisting the entire tubing assembly, completely eliminating torsional stress that causes premature pipe fatigue. Manufactured through closed-die forging and five-axis CNC precision machining, the adapter delivers a seamless, burr-free thread surface and a perfectly balanced swivel mechanism that rotates with zero resistance. With dual sealing options of metal-to-metal contact and elastomer assistance, it maintains an airtight seal even under continuous vibration and extreme temperature cycling. Suitable for conveying hydraulic oil, industrial water and compressed gases, it transforms potential leak points into reliable connections, significantly reducing unplanned downtime and ensuring uninterrupted operation of critical industrial equipment.
Manufactured in strict accordance with multiple international industrial standards, all thread pitches, swivel nut clearances and sealing surface flatness are controlled to micron-level tolerances. The carbon steel variant passes 96-hour neutral salt spray testing, while the stainless steel version withstands over 500 hours of salt spray exposure. Full series sizes cover DN6 to DN50, with complete dimensional drawings, torque specifications and pressure rating curves available upon request. All adapters are 100% interchangeable with standard metric tube fittings from global mainstream brands.
Floating Swivel Nut Mechanism: The independently rotating swivel nut eliminates the need to twist the entire tubing during installation, drastically reducing assembly time in tight spaces and preventing pipe deformation caused by forced alignment.
Anti-Galling Hardened Threads: Thread surfaces undergo special precision grinding and hardening treatment, ensuring smooth torque application and supporting repeated disassembly and reassembly without thread damage or sealing degradation.
Vibration Absorption Forged Structure: The one-piece closed-die forged body forms a continuous metal grain structure, effectively absorbing high-frequency vibrations from hydraulic pumps and preventing micro-cracks and joint loosening over long-term operation.
Low-Resistance Internal Flow Path: The polished internal bore with optimized transition geometry minimizes fluid turbulence and pressure drops, improving the overall energy efficiency of the hydraulic system by up to 8%.
Wide Temperature Adaptability: Engineered to maintain structural stability and sealing performance across a broad temperature range from -20°C to 200°C, resisting thermal expansion and contraction that causes seal failure.
Universal Media Compatibility: Carefully selected materials and sealing compounds ensure chemical compatibility with synthetic hydraulic fluids, mineral oils, industrial water and compressed industrial gases.
Carbon Steel (Cr3+ Zinc Plated)
Adopts an eco-friendly trivalent chromium zinc plating process without hexavalent chromium, forming a uniform, scratch-resistant protective layer that effectively resists red rust and oxidation. It offers excellent tensile strength and cost performance, making it ideal for general industrial hydraulic systems, construction machinery and indoor manufacturing equipment.
Stainless Steel (Passivation)
Through a low-temperature chemical passivation process, free iron on the surface is removed to form a dense, self-healing chromium oxide film. This enhances resistance to acids, alkalis and salt spray corrosion by 300% compared to untreated stainless steel, making it perfect for marine, petrochemical and food processing applications with strict hygiene requirements.
This metric female swivel nut adapter is widely used in hydraulic pipeline connections that require precise alignment and frequent maintenance in various core industrial fields:
Hydraulic Manifold & Valve Block Assemblies: Ideal for dense piping layouts in hydraulic power units and valve stations, where space is extremely limited and alignment accuracy is critical.
Injection Molding & Die Casting Equipment: Used in high-pressure hydraulic systems of injection molding machines and die casting machines, withstanding continuous pressure cycling and high-temperature operating environments.
Construction & Heavy Machinery: Hydraulic pipeline connections for excavators, cranes and road rollers, adapting to high-vibration and dusty outdoor working conditions.
Metallurgical & Mining Equipment: Suitable for high-temperature and high-pressure hydraulic systems of steel rolling equipment and mining machinery, with excellent resistance to thermal shock and mechanical impact.
Marine & Offshore Engineering: Stainless steel version is used for hydraulic systems of ship equipment and offshore platforms, providing reliable corrosion resistance in salt spray and humid marine environments.
The adapter body is formed by 1200-ton closed-die forging at high temperature, which aligns the metal grain flow with the component contours, eliminating internal voids and increasing burst pressure resistance by 40% compared to cast products. All threads, sealing surfaces and swivel nut mating surfaces are processed by five-axis CNC machine tools in a single setup, avoiding secondary clamping errors and ensuring dimensional consistency across every batch. Each unit undergoes 100% thread gauging, pressure testing and swivel function inspection before delivery, fully complying with international quality standards.
To assist your procurement and engineering teams, we have compiled answers to the most critical technical and operational inquiries regarding our metric tube adapters.
Yes, we are a specialized manufacturing facility located in Ningbo, Zhejiang Province. We possess complete in-house capabilities for the design, machining, forging, and testing of hose connectors, instrument fittings, and transition joints.
We utilize a combination of go/no-go thread gauges, optical comparators, and high-pressure test rigs. You are welcome to place a small sample order to independently verify the machining tolerances, surface finish, and sealing capabilities before committing to a larger volume.
Absolutely. We offer professional laser marking services. We can permanently etch your company logo, specific part numbers, thread sizes, or pressure ratings directly onto the hex body of the adapter for easy field identification.
For standard bulk orders, our manufacturing lead time is approximately 30 days. However, we maintain a substantial inventory of conventional, high-demand products, allowing us to fulfill small to medium shipments almost immediately.
We operate with maximum flexibility. If the specific 3C or 3D adapter you require is currently in our stock, there is absolutely no MOQ limit. MOQs are only established for out-of-stock items or highly specialized custom geometries that require unique tooling.
Yes, we strongly encourage engineering evaluations. We can provide product samples for a nominal, reasonable charge. The shipping freight will be routed to your designated courier account, ensuring you can perform physical fitment tests promptly.
