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UNF AGJ 3/4" JIC threaded hex socket plug

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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UNF AGJ 3/4" JIC threaded hex socket plug

The UNF AGJ 3/4" JIC threaded hex socket plug is a steel hydraulic blanking plug designed for closing appropriately matched ports with a UNF internal thread. The product features a 3/4" external thread and a hexagonal socket for an Allen key, which enables convenient assembly and disassembly. The plug can be used to blank compatible connections in pumps, directional control valves, and other power hydraulic system components.

The blanking plug is made of galvanized free-cutting steel, which protects its surface against corrosion. The plug is also available under the catalog designation Cast 207504. Its design with a UNF/UN-2A thread and hex socket allows for closing appropriately prepared threaded ports during assembly, repair, and maintenance of hydraulic equipment.

Technical parameters of the UNF AGJ 3/4" JIC plug

Product type: hydraulic plug, blanking screw.
Nominal thread size: 3/4".
Thread type: external UNF/UN-2A.
Thread system: UNF, JIC.
Standard thread for JIC 3/4" size: 3/4"-16 UNF.
Socket type: hexagonal for an Allen key.
Material: free-cutting steel.
Surface protection: zinc plating.
Designation according to Cast: 207504.
Purpose: blanking compatible ports with an internal thread.
Example application: pumps, hydraulic control valves, and appropriately adapted installation ends.
English name: Closure plug with hexagon socket head - thread UNF/UN-2A.

Application of the UNF AGJ 3/4" plug in power hydraulics

The UNF AGJ 3/4" JIC hex socket plug is designed for closing hydraulic connections equipped with a properly selected internal thread. It can be used during installation, component replacement, maintenance work, and machine servicing.

Example application sites include hydraulic pump bodies, control valves, and other components where compatible threaded holes are present. The plug can serve to close unused connections, provided the thread type, port design, and sealing method are compatible.

UNF 3/4" external thread – how to recognize it?

The blanking plug features an external UNF inch thread in the nominal size of 3/4". For a standard JIC thread of this size, the designation 3/4"-16 UNF is used, which corresponds to 16 threads per inch.

During thread identification, its outer diameter should be measured with a caliper and the pitch checked with an appropriate inch thread pitch gauge. Measurement results should be compared with the connection documentation. Simply matching the diameter is not enough to confirm thread compatibility.

Hexagonal socket for an Allen key

The plug is equipped with an internal hexagonal socket intended for operation with an Allen key. Such a solution allows for tightening and unscrewing the element without the need for an open-ended wrench on the external surface of the plug.

The design with a hex socket is useful in places with limited assembly space. During installation, use a tool properly fitted to the socket to avoid damaging its surface.

Free-cutting steel and zinc protection

The UNF AGJ 3/4" JIC plug is made of free-cutting steel. The surface of the element has been protected with zinc plating, which serves as anti-corrosion protection for the steel body.

When selecting a blanking plug, the operating environment, material requirements of the device, and the working conditions of the complete hydraulic connection should be taken into account.

Catalog designation Cast 207504

The UNF AGJ 3/4" JIC threaded hex socket plug has a designation according to Cast: 207504. The catalog number helps identify the correct variant when ordering hydraulic parts and comparing technical documentation.

Before using the element as a replacement, its compatibility with the previously used blanking plug must be confirmed. Not only the catalog designations are important, but also the design, thread, and required sealing method.

UNF, AGJ, and JIC – meaning of designations

UNF is a Unified Fine inch thread used, among others, in hydraulic connections. AGJ and JIC designations appear in the nomenclature of hydraulic connections with inch threads.

However, when selecting a plug, one must distinguish the thread system itself from the design of the sealing surfaces. Classic JIC connections use conical sealing surfaces, while the sealing type of a specific plug should be checked in its technical documentation. It should not be assumed that every plug with a 3/4" UNF thread will fit any JIC connection with the same thread.

How to choose a UNF AGJ 3/4" JIC plug?

Before purchasing, check if the hole to be blanked has the correct 3/4" UNF internal thread. It is also worth verifying its pitch, the design of the mating surfaces, and the method of achieving tightness.

When replacing a previously used plug, it is helpful to compare the Cast 207504 designation, the socket type, and the actual dimensions of the element. In the case of systems working under pressure, it is additionally necessary to confirm the permissible operating parameters of the plug and the entire connection.

Assembly and leak control of the plug

Before installing the plug, the device must be turned off and the hydraulic system safely depressurized. Then, the threaded hole must be cleaned, the thread condition inspected, and the mating surfaces checked.

The plug should be installed in a compatible connection using a properly selected Allen key. Tightening should be carried out according to the requirements of the given connection system. After assembly, check for proper attachment and tightness under safe conditions.

Technical specification

Parameter	Value
Product name	UNF AGJ 3/4" JIC threaded hex socket plug
Product type	Plug / blanking screw
Thread size	3/4"
Thread type	External UNF/UN-2A
Standard JIC 3/4" thread	3/4"-16 UNF
Socket	Hexagonal for Allen key
Material	Free-cutting steel
Surface protection	Zinc plating
Cast designation	207504
Purpose	Blanking compatible threaded ports

Frequently Asked Questions (FAQ)

What thread does the UNF AGJ 3/4" JIC plug have?

The plug has an external UNF thread in size 3/4". The standard JIC thread of this size is designated 3/4"-16 UNF.

What is the UNF 3/4" hex socket plug used for?

It is used for blanking compatible holes with an internal thread, including in appropriately adapted pumps and hydraulic directional control valves.

What wrench is used to install the plug?

The product has an internal hexagonal socket for an Allen key. The wrench size should be matched to the actual dimension of the socket.

What material is the blanking plug made of?

The plug is made of galvanized free-cutting steel.

What is the Cast designation for the UNF AGJ 3/4" hex socket plug?

The Cast catalog designation provided for this variant is 207504.

Does the plug fit every JIC 3/4" connection?

No. You must check the thread compatibility, port design, and sealing method. The 3/4" size alone does not guarantee the plug's applicability in every connection.