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Plastic threaded plug / cap male thread 9/16" UNF

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Manufacturer: HYDRON hydraulika siłowa (go to products)

Shipping time: 24 hours

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from €3.64 - GLS Courier (Poland)

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Plastic threaded plug / cap male thread 9/16" UNF

The plastic threaded plug 9/16" UNF is a protective cap designed for temporary sealing of ports and hydraulic connections with a compatible internal thread. The product is made of plastic and features a 9/16" UNF male thread. It is used to protect hydraulic hoses, directional control valves, cylinders, valves, and other components from dust, dirt, metal shavings, and contaminants.

The 9/16" UNF plastic plug is useful during machine repairs, hose replacement, part transportation, and storage of hydraulic components. It allows for temporary closing of an open connection until the final connection is made, reducing the risk of contaminants entering the component.

Important: the 9/16" UNF plastic plug does not withstand pressure loads. It must not be used to seal hydraulic or pneumatic systems operating under pressure.

Color information: plugs are available in various colors, packed and shipped randomly. The color of the received product may differ from the one shown in the photo.

Technical parameters of the 9/16" UNF plastic plug

Product type: protective plug, plastic threaded cap.
Connection type: male thread (external thread).
Thread size: 9/16" UNF.
Standard thread designation: 9/16"-18 UNF.
Thread system: Unified Inch Fine (UNF).
Standard nominal thread diameter: 14.2875 mm.
Standard number of threads: 18 TPI.
Standard thread pitch: approx. 1.411 mm.
Standard UNF thread profile angle: 60°.
Material: plastic.
Purpose: temporary protection of holes and threaded connections.
Pressure resistance: the product does not withstand pressure loads.
Color: various colors, packed randomly.
Application: protection of hoses, directional control valves, cylinders, and other hydraulic components.

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

The 9/16" UNF plastic threaded plug is used for temporary protection of open connections in power hydraulic elements. It can be used during repairs, technical inspections, hose replacements, and maintenance of agricultural, construction, and industrial machinery.

The plug is used in compatible ports of directional control valves, cylinders, valves, and hydraulic hose ends with the appropriate internal thread. It helps keep connections clean while the component remains disconnected from the system.

Male thread 9/16"-18 UNF – dimensions and identification

The 9/16" UNF thread belongs to the Unified Inch Fine (UNF) thread system. The standard designation 9/16"-18 UNF indicates a nominal diameter of 9/16 inch, which is 14.2875 mm, and 18 threads per inch. This corresponds to a pitch of approximately 1.411 mm.

The UNF thread has a 60° profile angle. In power hydraulics, the 9/16"-18 size is found in JIC and ORFS connections, among others, but a compatible thread size does not automatically mean compatibility with the sealing method. The plastic protective plug does not replace the working elements of these systems.

A caliper and a thread gauge for inch threads can be used to identify the thread. Before installation, confirm the actual diameter and number of threads per inch to avoid damaging the plastic plug or the connection thread.

Protection of hydraulic hoses from contamination

During service work, open hydraulic connections are exposed to dust, dirt, sand, and metal shavings. The 9/16" UNF plastic plug allows for temporary closing of a matching port, helping to limit the entry of contaminants into the system.

Component cleanliness is crucial for the durability of power hydraulic systems. Contaminants in the hydraulic oil can accelerate the wear of pumps, valves, directional control valves, and seals. Protecting disconnected connections is part of proper service work organization.

9/16" UNF plug for transport and storage

The 9/16" UNF plastic plug is useful when transporting and storing hydraulic parts. Temporary closing of a threaded hole helps protect the interior of the component from contaminants found in workshops, warehouses, and during transport.

The product can be used when preparing hydraulic hoses and components for shipping, repair, or reassembly. Before starting the equipment, the plug must be removed and the final hydraulic connection must be made.

Plastic – construction of the protective plug

The 9/16" UNF male thread plug is made of plastic. Its primary function is to secure threaded holes during transport, storage, and equipment servicing.

The plastic plug is not designed to withstand pressure loads. During installation, avoid overtightening, which could damage the thread or deform the plug body.

Plastic plug vs. pressure hydraulic plug

The 9/16" UNF protective plug is used for temporary closing of connections to reduce the risk of contamination. It is not intended to maintain operating pressure and cannot replace a properly selected pressure hydraulic plug.

If a connection is to remain closed during system operation, an element with confirmed pressure parameters, the correct thread, and the appropriate sealing method must be used. Compatibility of thread diameter and pitch does not mean that the plastic plug is suitable for such an application.

How to choose a 9/16" UNF plastic plug?

Before purchasing, check if the hole to be protected has a compatible 9/16" UNF internal thread. A standard 9/16"-18 UNF thread has a nominal diameter of 14.2875 mm and 18 threads per inch. Also, check the condition of the thread and the possibility of proper seating of the plug.

The plug is intended for temporary protection of connections during storage, transport, and repairs. It must not be used to seal a system under pressure.

Installation and removal of the 9/16" plastic plug

Before installation, turn off the device, safely relieve the pressure from the hydraulic system, and clean the threaded hole. Then, ensure that the male thread of the plug matches the internal thread of the connection to be protected.

The plug should be screwed in carefully, without using excessive force. If significant resistance occurs during installation, stop and check thread compatibility. Before restarting the system, the plastic plug must be removed.

Various colors – random packing

9/16" UNF plastic plugs are available in various colors. Individual color variants are packed and shipped randomly, so the color of the received product may differ from the one shown in the photo.

The primary selection criterion is thread compatibility and the protective purpose of the plug. The color does not determine its compatibility with the hydraulic connection.

Technical specification

Parameter	Value
Product name	Plastic threaded plug / cap male thread 9/16" UNF
Product type	Protective plug, plastic cap
Connection type	Male thread (external thread)
Thread size	9/16" UNF
Standard designation	9/16"-18 UNF
Nominal thread diameter	14.2875 mm
Standard thread pitch	18 TPI (approx. 1.411 mm)
Thread profile angle	60°
Material	Plastic
Pressure operation	Not allowed
Color	Various colors, packed randomly
Application	Temporary protection of hydraulic connections against contamination

Frequently Asked Questions (FAQ)

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

The plug is designated as male thread 9/16" UNF. A standard 9/16"-18 UNF thread has a nominal diameter of 14.2875 mm and 18 threads per inch. Before installation, confirm the thread compatibility of the specific product with the connection.

Does the 9/16" UNF plastic plug withstand hydraulic pressure?

No. The product does not withstand pressure loads and cannot be used to close a working hydraulic system.

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

It is used for temporary protection of hoses, directional control valves, cylinders, and other components from contamination during repairs, transport, storage, and assembly.

Is the 9/16" UNF thread used in JIC connections?

Yes. The 9/16"-18 UNF thread is found in JIC 37° hydraulic connections, among others. However, please remember that the plastic protective plug is not a sealing element designed for pressure operation.

Can I choose the color of the plug?

The product is available in various colors, packed and shipped randomly. The color of the delivered plug may differ from the one visible in the photo.