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Screw-in plastic plug / cap 1.5/16" 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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Threaded plastic plug / cap Male 1.5/16" UNF

The threaded plastic plug Male 1.5/16" UNF is a protective cap designed for the temporary protection of hydraulic ports and connections with a compatible female thread. The product features an external inch thread with a nominal size of 1 5/16" and is made of plastic. It helps protect hydraulic hoses, valves, cylinders, and other components from dust, dirt, shavings, and contamination during transport, storage, repairs, and assembly.

The 1.5/16" UNF plastic plug is used for temporarily closing open connections when a system component has been disconnected, prepared for service, or stored before assembly. In standard hydraulic connections of this size, a 1 5/16"-12 UN thread is used; therefore, before applying the plug, confirm the compatibility of the thread diameter and pitch with the port being protected.

Important: the plastic plug Male 1.5/16" UNF does not carry pressure loads. It is not intended for closing hydraulic or pneumatic systems operating under pressure.

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

Technical parameters of the 1.5/16" UNF plastic plug

Product type: protective cap, threaded plastic plug.
Connection type: Male – external thread.
Nominal thread size: 1 5/16".
Trade designation: 1.5/16" UNF.
Thread system: unified inch.
Standard hydraulic thread in this size: 1 5/16"-12 UN.
Standard number of threads: 12 per inch (12 TPI).
Standard thread pitch: approximately 2.117 mm.
Nominal thread diameter: approximately 33.34 mm.
Material: plastic.
Purpose: temporary protection of threaded ports and connections.
Operation under pressure: inadmissible – the product does not carry pressure loads.
Color: various colors, packed randomly.
Application: protection of hoses, valves, cylinders, and other hydraulic components.

Application of the 1 5/16" protective plug in power hydraulics

The threaded plastic plug Male 1 5/16" is designed for the temporary protection of compatible threaded ports in hydraulic systems. It can be used during hose replacement, machine repairs, equipment maintenance, and preparation of components for transport and storage.

The plug can be used in appropriately matched ports of hydraulic valves, cylinders, and hose ends with female threads. Its use helps limit the entry of contaminants into the interior of parts before reconnection to the system.

Male thread 1 5/16"-12 UN – dimensions and identification

The 1 5/16" designation corresponds to a nominal thread diameter of approximately 33.34 mm. In standard hydraulic connections of this size, there is a 1 5/16"-12 UN thread, having 12 threads per inch, which is a pitch of approximately 2.117 mm.

In trade terminology, threads of this type are sometimes referred to as UNF. However, for the standard hydraulic size 1 5/16"-12, the UN designation is used. Before assembly, confirm the actual pitch of the plug and its compatibility with the female thread of the connection being protected.

A caliper and an inch thread gauge can be used for thread identification. Both the diameter and the number of threads per inch should be checked, as the nominal size alone is not enough to confirm compatibility.

Protection of hydraulic hoses against contamination

During the disassembly of a hydraulic system, open hoses and connections may be exposed to contact with dust, dirt, sand, and metal shavings. The 1.5/16" UNF plastic plug allows for temporary closure of a properly matched port and helps protect the component's interior from contamination.

Maintaining the cleanliness of hydraulic components is crucial for the system's durability. Solid particles entering the system can accelerate the wear of hydraulic pumps, valves, and control units.

Plastic plug for transport and storage

The Male 1 5/16" protective plug is useful during the transport of hydraulic parts, their storage in a warehouse, and preparation for assembly. It allows for the temporary protection of a compatible threaded port against dust and accidental entry of foreign bodies.

The product is used in power hydraulic workshops, spare parts warehouses, and during component shipping. Before starting the device, the plug must be removed and the final hydraulic connection must be made.

Plastic – lightweight protective plug

The Male 1.5/16" UNF plug is made of plastic. Its primary task is to protect threaded ports during transport, storage, and service activities.

The plastic construction is not intended for carrying pressure loads. During assembly, avoid overtightening, which could cause deformation of the body or damage to the plug thread.

Protective plug vs. hydraulic pressure plug

The 1 5/16" plastic plug provides temporary protection for the connection against dirt. It is not intended to hold hydraulic oil pressure and cannot replace a hydraulic plug used during system operation.

If a connection must remain closed during equipment operation, an appropriately selected pressure plug with confirmed operating parameters and the correct sealing method must be used.

How to choose a Male 1.5/16" UNF plastic plug?

Before purchasing, check if the port being protected has a compatible female thread of size 1 5/16". In typical hydraulic connections, a 1 5/16"-12 UN thread occurs in this size. However, it is necessary to confirm the pitch and compliance of the actual plug execution.

Also evaluate the condition of the thread and the available mounting space. The plug is suitable for temporary protection of connections during transport, storage, and repairs, but not for operation under pressure.

Assembly and disassembly of the 1 5/16" plastic plug

Before assembly, turn off the device, safely depressurize the system, and clean the threaded port. Then check if the diameter and pitch of the plug thread correspond to the connection being protected.

The plug should be screwed in carefully without using excessive force. If there is noticeable resistance, stop the assembly and recheck the fit. Before starting the system, the plastic plug must be removed and the proper working connection must be made.

Various colors – random packaging

The Male 1.5/16" UNF plastic plugs are available in various colors. Color variants are packed and shipped randomly; therefore, the color of the received plug may differ from the one shown in the photo.

The basis for product selection is the compatibility of the thread and its protective purpose. The color does not determine compatibility with the hydraulic connection.

Technical specification

Parameter	Value
Product name	Threaded plastic plug / cap Male 1.5/16" UNF
Product type	Protective cap, plastic plug
Thread type	Male – external, inch
Nominal size	1 5/16"
Standard hydraulic thread of this size	1 5/16"-12 UN
Standard pitch	12 TPI (approximately 2.117 mm)
Nominal diameter	Approximately 33.34 mm
Material	Plastic
Work under pressure	Not intended for carrying pressure loads
Color	Various colors, packed randomly
Application	Temporary protection of hydraulic connections against contamination

Frequently Asked Questions (FAQ)

What thread does the 1.5/16" UNF plastic plug have?

The plug has an external inch thread with a nominal size of 1 5/16". In standard hydraulic connections of this size, there is a 1 5/16"-12 UN thread, the compatibility of which with a specific plug should be confirmed.

Does the 1 5/16" plastic plug withstand hydraulic pressure?

No. The product does not carry pressure loads and cannot be used to close an operating hydraulic system.

What is the Male 1.5/16" plastic plug used for?

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

Can I choose the color of the plug?

Plugs are available in various colors, packed randomly. The color of the delivered product may differ from the one shown in the photo.

Do the designations UNF and 1 5/16"-12 UN mean the same thing?

These are not identical technical designations. In trade terminology, hydraulic threads of this type are sometimes referred to as UNF, whereas the standard 1 5/16"-12 thread is designated as UN.