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UNF AGJ 7/8" JIC hex socket threaded plug

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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UNF AGJ 7/8" JIC hex socket threaded plug

The UNF AGJ 7/8" JIC hex socket threaded plug is a steel sealing element designed for closing compatible ports with female threads. It is equipped with a 7/8" UNF male thread and a hexagonal socket for a hex (Allen) key. The design of the plug allows its installation in appropriately selected hydraulic connections, including pump bodies and manifolds.

The plug is made of galvanized free-cutting steel. In the HYDRON catalog, the product appears as an UNF AGJ 7/8" JIC hex socket plug, also referred to as VSTI. It is intended for sealing threads during assembly, maintenance, and repair of power hydraulic systems.

Technical parameters of the UNF AGJ 7/8" JIC plug

Product type: threaded plug, hydraulic blanking plug.
Thread size: 7/8".
Thread type: male UNF/UN-2A.
Standard JIC 7/8" thread designation: 7/8"-14 UNF.
Socket: hexagonal, for hex (Allen) key.
Material: free-cutting steel.
Surface protection: zinc plating.
Designation in the catalog: VSTI.
Purpose: sealing compatible ports with female threads.
Example application: hydraulic pumps and manifolds.

Application of the UNF AGJ 7/8" plug in power hydraulics

The UNF AGJ 7/8" JIC hex socket plug is used to close appropriately selected threaded ports in hydraulic installations and equipment. It can be used during the assembly of new systems, component replacement, maintenance work, and for securing unused connections.

Example application sites include hydraulic pump and manifold bodies. A condition for correct use is the compatibility of the plug thread with the port thread and the matching of the sealing surface design.

UNF 7/8"-14 male thread – identification

The plug has a male thread in the 7/8" size. For the standard JIC thread of this diameter, the designation 7/8"-14 UNF is used, which corresponds to 14 threads per inch. UNF thread is a unified fine pitch inch thread used, among others, in power hydraulics.

When identifying the thread, measuring the outer diameter with a caliper and checking the number of threads with an inch thread gauge are helpful. Before installation, ensure that the female thread of the connection matches the plug thread.

Hexagonal socket for hex (Allen) key

The design of the plug includes an internal hexagonal socket allowing for installation and removal with a hex key. This allows the plug to be tightened and loosened without the need to grip its outer surface with a flat wrench.

This solution can facilitate the servicing of connections located in places with limited assembly space. A tool matching the actual dimensions of the socket should be used for work.

Galvanized free-cutting steel

The UNF AGJ 7/8" JIC plug is made of galvanized free-cutting steel. The zinc coating serves a protective function, reducing the susceptibility of the steel surface to corrosion.

When choosing the product, the operating environment and the material requirements of the specific system must be taken into account. In the case of installations operating under pressure, it is necessary to confirm the allowable parameters of the plug and the mating connection.

UNF, AGJ, and JIC – meaning of designations

UNF stands for unified fine pitch inch thread, while AGJ and JIC appear in the nomenclature of hydraulic connections. The JIC designation is associated with fittings having a 37° sealing cone, but it does not automatically mean that every plug with this name has an identical seal design.

In the case of a hex socket plug, the geometry of the specific port must be verified. The matching thread size alone does not confirm that the plug will correctly seal every JIC 7/8" connection.

How to choose a UNF AGJ 7/8" JIC plug?

When choosing a plug, check the thread size and pitch of the port to be sealed. For this product, the primary identification parameter is the UNF 7/8" male thread. It is also necessary to determine the design of the mating surfaces and the required sealing method.

If the plug is to replace a previously used element, compare the thread type, design dimensions, and the mounting socket. Before use under pressure, the operating parameters of the specific variant should also be confirmed.

Installation and leakage control of the plug

Before starting installation, turn off the device and safely depressurize the hydraulic system. Then, clean the threaded port, check the condition of the plug thread and the mating surfaces.

The plug should be screwed into a compatible port and tightened with an appropriately selected hex key according to the requirements of the given connection system. After installation is complete, check for proper attachment and tightness under safe conditions.

Technical specification

Parameter	Value
Product name	UNF AGJ 7/8" JIC hex socket threaded plug
Product type	Hydraulic plug / blanking plug
Thread size	7/8"
Thread type	Male UNF/UN-2A
Standard JIC 7/8" thread	7/8"-14 UNF
Socket	Hexagonal for hex key
Material	Free-cutting steel
Surface protection	Zinc plating
Designation in the catalog	VSTI
Purpose	Sealing compatible threaded ports