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T: +86-15990630008
E: info@chinahdm.com
E: info@chinahdm.com
Industrial zone, Binhai, Jiaojiang, Taizhou, Zhejiang, China
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The 4MN Hydraulic Plug stands as an essential component in industrial hydraulic systems, designed specifically to provide secure temporary or permanent sealing for hydraulic hose ends and port openings. Engineered to meet the rigorous demands of industrial environments, this plug combines robust construction with precision sealing technology to prevent fluid loss and contamination ingress when lines are disconnected or during system maintenance. Its versatility makes it suitable for both operational and storage applications, ensuring hydraulic systems remain protected and ready for service when needed. The 4MN plug has become a trusted solution in industries where system reliability and maintenance efficiency are critical operational factors.
The 4MN Hydraulic Plug features a flat face design with an integrated O-ring seal, ensuring positive sealing on compatible hydraulic ports and hose ends. This design conforms to ISO 16028 standards, guaranteeing compatibility with a wide range of industry-standard components. The plug incorporates a G 3/8 inch female thread as standard, with other thread sizes available to meet specific application requirements. The sealing surface is precision-machined to ensure uniform contact pressure, eliminating leak paths and providing consistent sealing performance across multiple installations.
Constructed to handle industrial hydraulic pressures, the 4MN Hydraulic Plug is rated for a maximum operating pressure of 5,075 PSI (350 bar) at ambient temperatures. It maintains reliable sealing performance across a temperature range of -25°C to 125°C (-13°F to 257°F), making it suitable for applications exposed to both cold and moderately high-temperature conditions. This broad operating envelope ensures the plug performs consistently in diverse industrial environments, from cold storage facilities to heated manufacturing plants.
The plug body is manufactured from high-quality carbon steel with a galvanic zinc plating that provides excellent corrosion resistance and extends service life in harsh environments. The sealing O-ring is made from NBR (nitrile rubber), chosen for its compatibility with most hydraulic fluids, including mineral oils, water-glycol mixtures, and synthetic hydraulic fluids. For specialized applications, optional materials such as stainless steel for the body and fluorocarbon for the O-ring are available to provide enhanced resistance to aggressive chemicals or extreme temperatures.
In manufacturing facilities, the 4MN Hydraulic Plug is indispensable during scheduled maintenance and repair operations. It provides a secure seal when hydraulic lines are disconnected for component replacement or system servicing, preventing fluid loss and contamination. This capability is particularly valuable in production environments where minimizing fluid waste and maintaining clean systems are essential for operational efficiency and environmental compliance.
When hydraulic equipment is stored or transported, the 4MN plug protects open ports and hose ends from moisture, dust, and debris that could compromise system performance. It is widely used in the storage of agricultural implements, construction machinery, and industrial tooling during off-season periods or between job sites, ensuring equipment remains ready for immediate use when needed.
During hydraulic system testing and commissioning, the 4MN Hydraulic Plug provides a reliable means to isolate system sections for pressure testing, flushing, or component break-in. Its high-pressure rating allows it to be used during pressure testing procedures without compromising safety, while its secure sealing prevents fluid leakage that could obscure test results or create hazardous conditions.
The 4MN Hydraulic Plug is designed and manufactured to comply with ISO 16028 standards, which specify dimensions and performance requirements for flat face hydraulic couplings. This compliance ensures interchangeability with other ISO 16028-compatible components from different manufacturers, providing flexibility in system design and maintenance. The plug's thread dimensions conform to standard metric and imperial specifications for broad compatibility.
The plug's integrated O-ring seal creates a barrier against contaminants when installed on open ports or hose ends. Unlike simple caps or plugs that may allow dust ingress, the 4MN design maintains a positive seal even when subjected to vibration or movement during transportation or storage. This sealing action prevents moisture, dirt, and debris from entering the hydraulic system, where such contaminants could cause valve sticking, cylinder scoring, or premature component wear when the system is reactivated.
The 4MN Hydraulic Plug is rated for a maximum operating pressure of 5,075 PSI (350 bar) under standard operating conditions. This rating applies to both temporary pressure testing situations and permanent installations where the plug is used to seal unused ports in operational systems. It's important to note that pressure ratings may be reduced at extreme temperature extremes, and the plug should not be used beyond its specified pressure or temperature limits.
Installation requires cleaning the port or hose end thoroughly before applying a small amount of compatible hydraulic fluid to the O-ring. The plug should be hand-tightened initially, then snugged with a wrench to ensure a proper seal—typically 1/4 to 1/2 turn beyond hand tight, depending on size. Over-tightening should be avoided as it can damage threads or distort the sealing surface. Removal should be done with a properly sized wrench, taking care to relieve any residual pressure in the system before loosening the plug to prevent sudden fluid release.
Yes, the 4MN plug is designed for multiple reuses when properly maintained. The number of reuse cycles depends on the condition of the threads, sealing surfaces, and O-ring. With proper care—including regular inspection for thread damage, cleaning of sealing surfaces, and replacement of O-rings when signs of wear or degradation appear—the plug can be reused dozens of times. For critical high-pressure applications, we recommend more frequent inspection of the O-ring and sealing surfaces to ensure continued reliable performance.
PART NO. | THREAD | DIMENSIONS | Mpa | |||||
T1 | L | L1 | S1 | |||||
H4MN-10WD | M10X1 | 12.3 | 8 | 5 | 50 | |||
H4MN-12WD | M12X1.5 | 17.3 | 12 | 6 | ||||
H4MN-14WD | M14X1.5 | 17.3 | 12 | 6 | ||||
H4MN-16WD | M16X1.5 | 17.3 | 12 | 8 | 40 | |||
H4MN-18WD | M18X1.5 | 17.3 | 12 | 8 | ||||
H4MN-20WD | M20X1.5 | 19.3 | 14 | 10 | ||||
H4MN-22WD | M22X1.5 | 19.3 | 14 | 10 | 25 | |||
H4MN-26WD | M26X1.5 | 21.3 | 16 | 12 | ||||
H4MN-27WD | M27X2 | 21.3 | 16 | 12 | ||||
H4MN-33WD | M33X2 | 22.8 | 16 | 17 | ||||
H4MN-42WD | M42X2 | 22.8 | 16 | 22 | ||||
H4MN-48WD | M48X2 | 22.8 | 16 | 24 | ||||
The 4MN Hydraulic Plug stands as an essential component in industrial hydraulic systems, designed specifically to provide secure temporary or permanent sealing for hydraulic hose ends and port openings. Engineered to meet the rigorous demands of industrial environments, this plug combines robust construction with precision sealing technology to prevent fluid loss and contamination ingress when lines are disconnected or during system maintenance. Its versatility makes it suitable for both operational and storage applications, ensuring hydraulic systems remain protected and ready for service when needed. The 4MN plug has become a trusted solution in industries where system reliability and maintenance efficiency are critical operational factors.
The 4MN Hydraulic Plug features a flat face design with an integrated O-ring seal, ensuring positive sealing on compatible hydraulic ports and hose ends. This design conforms to ISO 16028 standards, guaranteeing compatibility with a wide range of industry-standard components. The plug incorporates a G 3/8 inch female thread as standard, with other thread sizes available to meet specific application requirements. The sealing surface is precision-machined to ensure uniform contact pressure, eliminating leak paths and providing consistent sealing performance across multiple installations.
Constructed to handle industrial hydraulic pressures, the 4MN Hydraulic Plug is rated for a maximum operating pressure of 5,075 PSI (350 bar) at ambient temperatures. It maintains reliable sealing performance across a temperature range of -25°C to 125°C (-13°F to 257°F), making it suitable for applications exposed to both cold and moderately high-temperature conditions. This broad operating envelope ensures the plug performs consistently in diverse industrial environments, from cold storage facilities to heated manufacturing plants.
The plug body is manufactured from high-quality carbon steel with a galvanic zinc plating that provides excellent corrosion resistance and extends service life in harsh environments. The sealing O-ring is made from NBR (nitrile rubber), chosen for its compatibility with most hydraulic fluids, including mineral oils, water-glycol mixtures, and synthetic hydraulic fluids. For specialized applications, optional materials such as stainless steel for the body and fluorocarbon for the O-ring are available to provide enhanced resistance to aggressive chemicals or extreme temperatures.
In manufacturing facilities, the 4MN Hydraulic Plug is indispensable during scheduled maintenance and repair operations. It provides a secure seal when hydraulic lines are disconnected for component replacement or system servicing, preventing fluid loss and contamination. This capability is particularly valuable in production environments where minimizing fluid waste and maintaining clean systems are essential for operational efficiency and environmental compliance.
When hydraulic equipment is stored or transported, the 4MN plug protects open ports and hose ends from moisture, dust, and debris that could compromise system performance. It is widely used in the storage of agricultural implements, construction machinery, and industrial tooling during off-season periods or between job sites, ensuring equipment remains ready for immediate use when needed.
During hydraulic system testing and commissioning, the 4MN Hydraulic Plug provides a reliable means to isolate system sections for pressure testing, flushing, or component break-in. Its high-pressure rating allows it to be used during pressure testing procedures without compromising safety, while its secure sealing prevents fluid leakage that could obscure test results or create hazardous conditions.
The 4MN Hydraulic Plug is designed and manufactured to comply with ISO 16028 standards, which specify dimensions and performance requirements for flat face hydraulic couplings. This compliance ensures interchangeability with other ISO 16028-compatible components from different manufacturers, providing flexibility in system design and maintenance. The plug's thread dimensions conform to standard metric and imperial specifications for broad compatibility.
The plug's integrated O-ring seal creates a barrier against contaminants when installed on open ports or hose ends. Unlike simple caps or plugs that may allow dust ingress, the 4MN design maintains a positive seal even when subjected to vibration or movement during transportation or storage. This sealing action prevents moisture, dirt, and debris from entering the hydraulic system, where such contaminants could cause valve sticking, cylinder scoring, or premature component wear when the system is reactivated.
The 4MN Hydraulic Plug is rated for a maximum operating pressure of 5,075 PSI (350 bar) under standard operating conditions. This rating applies to both temporary pressure testing situations and permanent installations where the plug is used to seal unused ports in operational systems. It's important to note that pressure ratings may be reduced at extreme temperature extremes, and the plug should not be used beyond its specified pressure or temperature limits.
Installation requires cleaning the port or hose end thoroughly before applying a small amount of compatible hydraulic fluid to the O-ring. The plug should be hand-tightened initially, then snugged with a wrench to ensure a proper seal—typically 1/4 to 1/2 turn beyond hand tight, depending on size. Over-tightening should be avoided as it can damage threads or distort the sealing surface. Removal should be done with a properly sized wrench, taking care to relieve any residual pressure in the system before loosening the plug to prevent sudden fluid release.
Yes, the 4MN plug is designed for multiple reuses when properly maintained. The number of reuse cycles depends on the condition of the threads, sealing surfaces, and O-ring. With proper care—including regular inspection for thread damage, cleaning of sealing surfaces, and replacement of O-rings when signs of wear or degradation appear—the plug can be reused dozens of times. For critical high-pressure applications, we recommend more frequent inspection of the O-ring and sealing surfaces to ensure continued reliable performance.
PART NO. | THREAD | DIMENSIONS | Mpa | |||||
T1 | L | L1 | S1 | |||||
H4MN-10WD | M10X1 | 12.3 | 8 | 5 | 50 | |||
H4MN-12WD | M12X1.5 | 17.3 | 12 | 6 | ||||
H4MN-14WD | M14X1.5 | 17.3 | 12 | 6 | ||||
H4MN-16WD | M16X1.5 | 17.3 | 12 | 8 | 40 | |||
H4MN-18WD | M18X1.5 | 17.3 | 12 | 8 | ||||
H4MN-20WD | M20X1.5 | 19.3 | 14 | 10 | ||||
H4MN-22WD | M22X1.5 | 19.3 | 14 | 10 | 25 | |||
H4MN-26WD | M26X1.5 | 21.3 | 16 | 12 | ||||
H4MN-27WD | M27X2 | 21.3 | 16 | 12 | ||||
H4MN-33WD | M33X2 | 22.8 | 16 | 17 | ||||
H4MN-42WD | M42X2 | 22.8 | 16 | 22 | ||||
H4MN-48WD | M48X2 | 22.8 | 16 | 24 | ||||