Hex head threaded plug - version A

Metric threaded steel hex head plugs, designed for plugging threads. Plugs manufactured according to Polish Standard: PN-65/M-73124 variant A - with a hexagonal head for a wrench. A plug designed for sealing hydraulic threads. Application: plugging all types of threads in directional control valves, flow dividers, actuators etc.  Available in hex head (A) and socket head (B) versions. The plug does not have a cone or a seal - to seal it, you must use a bonded seal or a copper washer.  Made of carbon steel covered with a galvanic coating in white passivation. The following category includes plugs with metric threads, which are less common. More popular are metric plugs in the socket head version, which are equipped with a rubber sealing washer. Plugs with metric threads are becoming less common - BSP (British Standard Pipe) threaded plugs are more popular. 

Technical parameters of the plugs 

• Intended use: plugging internal threads 
• Material: galvanized free-cutting steel 
• Manufacture: according to Polish standard PN-65/M-73124
• Thread type: metric 

Hex head plugs for power hydraulics

Hex head plugs are elements designed for closing and securing unused ports and openings in power hydraulic systems. Their design allows for convenient assembly and disassembly using an appropriate wrench, facilitating maintenance and access to the closed point of the installation.

These types of plugs are used in control valves, valves, hydraulic blocks, hoses, and other components where permanent or temporary closure of a port is necessary.

What are hydraulic hex head plugs used for?

The primary task of a plug is to close an unused installation point and protect the interior of the system from contamination. The design adapted for wrench operation facilitates proper tightening of the element and subsequent disassembly during inspection, repair, or system expansion.

Hex head plugs can be used as both permanent and service components, depending on the design of the specific hydraulic system.

Where are hex head plugs used?

• in hydraulic control valves,
• in valves and hydraulic blocks,
• in hoses and connections,
• in agricultural and construction machinery,
• in mobile hydraulics,
• in industrial installations and serviced hydraulic systems.

How to choose the right hex head plug?

Before purchasing, accurately identify the port to be closed. The thread standard, its size, and the sealing method are crucial. The thread diameter alone is not always sufficient for correct selection, as many different connection systems are used in hydraulics.

• check the thread standard,
• determine the diameter and thread pitch,
• verify the sealing method,
• select the correct plug size,
• check the technical parameters of the specific variant,
• ensure the plug fits the specific port.

Hex head plug vs. socket head plug

The difference primarily concerns the mounting method. A hex head plug has surfaces for tightening with an appropriate wrench, while a socket head plug uses an internal hexagonal socket. The choice depends on the system design, the amount of available space, and the maintenance method.

Hydraulic plugs and caps for various connections

One system may contain different types of threads and sealing surfaces, so a plug should always be selected for a specific port. Do not use a component based solely on a similar thread dimension.

If you need other variants, also check hydraulic plugs and caps and other hydraulic fittings available at HYDRON.

FAQ - hex head plugs

What is a hydraulic hex head plug for?

It is used to close and secure an unused port or opening in a hydraulic installation.

How to choose the plug size?

You should check the standard, diameter, and thread pitch, as well as the sealing method of the specific port.

What is the difference between a hex head plug and a socket head plug?

They differ in the mounting method. A hex head plug is tightened using external surfaces, while a socket head plug has an internal hexagonal socket.

Will every hydraulic plug fit a thread with a similar diameter?

No. Different standards may have similar dimensions but differ in thread geometry and sealing method.