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Threaded plug for Allen key UNF AGJ 9/16" JIC

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Threaded plug for Allen key UNF AGJ 9/16" JIC

The UNF AGJ 9/16" JIC threaded plug for Allen key is a plugging element designed for closing appropriately selected ports with UNF internal threads. It features a 9/16" external thread and an internal hexagonal socket for assembly with an Allen key. The product is intended for use in compatible power hydraulics connections.

The 9/16" threaded plug can be used during the assembly and maintenance of hydraulic devices, including closing properly prepared ports in pump bodies, directional control valves, and other components. The standard JIC thread of this size is designated as 9/16"-18 UNF. Before assembly, verify the compatibility of the thread and the design of the sealing surfaces.

Technical parameters of the UNF AGJ 9/16" JIC plug

Product type: threaded plug, hydraulic cap.
Nominal thread size: 9/16".
Thread type: external UNF.
Standard JIC 9/16" thread designation: 9/16"-18 UNF.
Standard thread pitch: 18 threads per inch.
Socket type: hexagonal, for Allen key.
Purpose: plugging compatible ports with internal threads.
Example application: power hydraulics systems, appropriately adapted pump bodies and directional control valves.

Application of the UNF 9/16" plug in power hydraulics

The UNF AGJ 9/16" JIC plug for Allen key is designed for plugging appropriately matched threaded ports in hydraulic system components. It can be used during equipment assembly, maintenance work, repairs, and closing unused connections.

The plug can be used in compatible ports of pump bodies and hydraulic directional control valves. A prerequisite for correct assembly is the compatibility of the thread size and pitch as well as the connection sealing method.

9/16"-18 UNF external thread – how to recognize it?

In standard JIC connections, a 9/16" size thread has 18 threads per inch, so its full notation is 9/16"-18 UNF. The number 9/16" specifies the nominal diameter of the thread, while 18 denotes the number of threads per one inch of length.

When identifying the thread, a caliper can be used to measure the external diameter and a pitch gauge for inch threads to check the pitch. Measurements should be compared with the technical documentation of the connection. Diameter compatibility without pitch confirmation is not sufficient for proper plug selection.

Hexagonal socket for Allen key

The plug is equipped with a hexagonal socket, allowing it to be tightened and loosened using an Allen key. This solution allows handling the plug without the need to grip its external surface with a flat wrench.

The design is useful in places with limited assembly space. For tightening, a tool matching the actual size of the socket should be used to avoid damaging it.

UNF, AGJ and JIC – meaning of designations

UNF stands for Unified National Fine thread. The designations AGJ and JIC appear in the nomenclature of hydraulic inch connections. However, when choosing a plug, it is important to distinguish the thread itself from the design of the surfaces responsible for sealing.

Classic JIC connections use 37° conical surfaces, but this does not mean that every plug with a UNF thread and an Allen socket has the same sealing design. In the case of this plug, the sealing method should be matched to the specific port and confirmed in the product documentation.

Plugging ports in pumps and directional control valves

The UNF AGJ 9/16" JIC threaded plug can be used to close compatible connection ports in hydraulic devices. This applies, among others, to appropriately adapted pump bodies and directional control valves and other elements equipped with internal threads.

Plugging an unused connection is one of the activities performed during the assembly and maintenance of the installation. Before using the plug, check if its design corresponds to the requirements of the given connection.

How to choose a UNF AGJ 9/16" JIC plug?

The primary selection criterion is the compatibility of the external thread of the plug with the internal thread of the port being plugged. Verify the nominal size 9/16", the thread pitch, and the type of hydraulic connection.

It is also essential to determine the required sealing method. The 9/16"-18 UNF thread itself does not automatically mean the plug can be used in every JIC port of this size. The required operating pressure and temperature of the complete connection must also be checked.

Installation and leakage control of the plug

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

The plug should be installed with an appropriately selected Allen key, in accordance with the technical requirements of the specific connection. After assembly, check the correctness of the fastening and tightness. In systems operating under pressure, it is necessary to previously confirm the permissible parameters of the entire connection.

Technical specification

Parameter	Value
Product name	Threaded plug for Allen key UNF AGJ 9/16" JIC
Product type	Hydraulic plug / cap
Thread size	9/16"
Thread type	External UNF
Standard JIC 9/16" thread	9/16"-18 UNF
Socket	Hexagonal for Allen key
Purpose	Plugging compatible threaded ports

Frequently Asked Questions (FAQ)

What thread does the UNF AGJ 9/16" JIC plug have?

The plug has an external UNF inch thread with a size of 9/16". The standard notation of this thread in the JIC system is 9/16"-18 UNF, which is 18 threads per inch.

What is the UNF 9/16" plug for Allen key used for?

It is used to close compatible ports with an internal thread, for example, in appropriately adapted bodies of hydraulic devices.

What wrench is used to install the plug?

The product is equipped with a hexagonal socket designed for assembly with an Allen key. The key size should be matched to the plug's socket.

Does the plug fit every JIC 9/16" connection?

No. Before assembly, verify the thread compatibility, port construction, and sealing method. The 9/16" size alone does not guarantee a tight connection.

How to check a 9/16" UNF thread?

Measure the external diameter of the thread with a caliper and check its pitch with a pitch gauge for inch threads. A standard JIC 9/16" thread has 18 threads per inch.