Product Overview
The 4C / 4D hydraulic plug is a precision-engineered pipe end fitting designed for sealing and terminating hydraulic tube connections in high-pressure hydraulic systems. Featuring a male thread with a 24° cone sealing structure, it provides secure and leak-free closure for unused ports and pipeline ends, helping maintain system pressure integrity and operational safety.
Manufactured in accordance with DIN 3861, DIN 2353, and ISO 8434 standards, the 4C / 4D plug is fully compatible with standard metric hydraulic tube fitting systems. Available in both Light Series (4C) and Heavy Series (4D), it offers reliable sealing performance across a wide range of industrial applications.
Features & Advantages
Designed for demanding hydraulic environments, the 4C / 4D hydraulic plug delivers excellent sealing performance, high pressure resistance, and long-term durability. The precision-machined 24° cone sealing surface ensures a tight and reliable connection, effectively preventing hydraulic fluid leakage even under high pressure and vibration.
Manufactured from high-quality carbon steel, these plugs provide excellent mechanical strength, wear resistance, and impact resistance for long service life. Standard zinc-plated surface treatment enhances corrosion resistance, while optional surface coatings such as zinc-nickel plating offer additional protection in humid, outdoor, or corrosive environments.
With maximum working pressure up to 630 bar (9000 PSI), the 4C / 4D plug ensures dependable sealing performance in critical hydraulic systems.
Technical Specifications
Product Type: Hydraulic Pipe End Plug
Connection Type: DIN 24° Cone Male Thread
Standards: DIN 3861 / DIN 2353 / ISO 8434
Material: Carbon Steel
Surface Treatment: Zinc Plated / Zn-Ni Optional
Working Pressure: Up to 630 bar (9000 PSI)
Thread Type: Metric Thread
Available Series: Light Series (4C) / Heavy Series (4D)
Applicable Media: Hydraulic Oil, Lubricating Oil, Industrial Fluids
Available Sizes
Light Series (4C): 06L – 42L
Heavy Series (4D): 06S – 38S
(Original dimension table can be placed here.)
Applications
The 4C / 4D hydraulic plug is widely used in construction machinery, hydraulic power units, industrial automation systems, wind turbine hydraulic circuits, and marine or offshore equipment. It is ideal for sealing unused hydraulic ports, temporary maintenance outlets, and terminating hydraulic tube lines during system servicing or modification.
Why Choose Us
As a professional hydraulic fitting manufacturer, we provide hydraulic plugs with strict dimensional control, stable product quality, and reliable delivery capability. Every product undergoes precision machining and quality inspection to ensure sealing accuracy and interchangeability.
We also support OEM and customized production for special dimensions, thread specifications, and surface treatments. With competitive factory pricing and fast delivery for standard models, we help customers reduce procurement costs while ensuring long-term hydraulic system reliability.
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