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Screw-in plastic blanking plug / cap male thread 1/2" UNF

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Manufacturer: HYDRON hydraulika siłowa (go to products)

Shipping time: 24 hours

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from €3.62 - GLS Courier (Poland)

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Threaded plastic blanking plug / cap male thread 1/2" UNF

The threaded plastic blanking plug male thread 1/2" UNF is a protective cap with an imperial male thread, designed for temporary closing of compatible ports and hydraulic connections. Made of plastic, the product helps protect hoses, control valves, cylinders, and other components from dust, dirt, metal shavings, and contamination during transport, storage, assembly, and repairs.

The 1/2" UNF plastic plug allows for temporary closing of a matching threaded port until the final connection is made. It is useful during hydraulic hose replacement, servicing agricultural and industrial machinery, and preparing installation components for transport.

Important: the plastic blanking plug male thread 1/2" UNF does not withstand pressure loads. It must not be used to close hydraulic or pneumatic systems operating under pressure.

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

Technical parameters of the 1/2" UNF plastic blanking plug

Product type: protective blanking plug, threaded plastic cap.
Connection type: male thread (GZ).
Thread size: 1/2" UNF.
Standard thread designation: 1/2"-20 UNF.
Thread system: unified imperial, fine thread.
Standard nominal thread diameter: 12.7 mm.
Standard number of turns: 20 TPI.
Standard thread pitch: 1.27 mm.
UNF standard thread profile angle: 60°.
Material: plastic.
Intended use: temporary protection of ports and threaded connections.
Operation under pressure: not allowed.
Color: various colors, packed randomly.
Application: protection of hoses, control valves, cylinders, and other hydraulic components.

Application of the 1/2" UNF protective plug in power hydraulics

The plastic threaded plug male thread 1/2" UNF is used for temporary protection of open connections during service work, technical inspections, hose replacement, and maintenance of hydraulic equipment. It can be used in compatible ports of control valves, cylinders, valves, and other installation elements.

The blanking plug helps limit the entry of contaminants into the component when a hose has been disconnected or a part is prepared for repair. The product serves a protective function and is not intended for sealing installations during operation under pressure.

Male thread 1/2"-20 UNF – dimensions and identification

The 1/2" UNF thread belongs to the system of unified imperial fine threads. The standard designation 1/2"-20 UNF specifies a nominal diameter of 1/2 inch, which is 12.7 mm, and 20 threads per inch. This corresponds to a pitch of 1.27 mm.

UNF thread has a 60° profile angle. When identifying the connection, distinguish the 1/2"-20 UNF thread from other imperial threads, particularly BSP and NPT. Similar size designations do not mean compatibility of diameter, pitch, or thread shape.

A caliper and an imperial thread gauge can be used for measurements. Before installation, confirm that the diameter and number of threads of the blanking plug correspond to the port being protected.

Protecting hydraulic hoses from contamination

When disconnecting hydraulic systems, open hoses and connections are exposed to contact with dust, sand, and metal shavings. The plastic blanking plug male thread 1/2" UNF allows for temporary closing of a compatible port, helping to limit the ingress of dirt into the component.

Maintaining the cleanliness of hydraulic hoses and parts is important for the proper operation of the system. Contaminants entering the hydraulic oil can cause accelerated wear of pumps, valves, control valves, and sealing elements.

Male thread 1/2" UNF blanking plug for transport and storage

The 1/2" UNF plastic cap is useful during the transport and storage of hydraulic parts. Temporary closing of the threaded port helps protect its interior from dust and accidental entry of foreign bodies.

The product can be used when preparing hoses and components for shipment, storage, and re-assembly. Before starting the installation, the protective blanking plug must be removed and the target hydraulic connection must be made.

Plastic material – design of the protective blanking plug

The male thread 1/2" UNF blanking plug is made of plastic. Its primary task is the temporary protection of ports and threaded connections during transport, storage, and service work.

The plastic construction is not intended to withstand pressure loads. During installation, avoid excessive tightening, which could lead to thread damage or deformation of the plug body.

Plastic blanking plug vs. hydraulic pressure plug

The plastic plug male thread 1/2" UNF performs a protective function and is used for temporary protection of ports against contamination. It is not adapted to hold working pressure and cannot replace a hydraulic plug intended for operation under pressure.

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

How to choose a male thread 1/2" UNF plastic blanking plug?

Before purchasing, ensure that the port to be protected has a compatible 1/2" UNF female thread. The standard 1/2"-20 UNF thread has a nominal diameter of 12.7 mm and 20 threads per inch. Before installation, confirm the compatibility of the actual plug thread with the connection.

The product is suitable for temporary protection during transport, storage, and repairs, but cannot be used to close a hydraulic system operating under pressure.

Installation and removal of the 1/2" plastic cap

Before installation, turn off the device, safely depressurize the hydraulic system, and clean the threaded port. Then check the fit of the blanking plug thread to the connection being protected.

The cap should be screwed in carefully, without excessive force. If clear resistance appears during installation, stop screwing and check the compatibility of the threads again. Before starting the installation, the plastic blanking plug must be removed.

Different colors – random packing

Plastic blanking plugs male thread 1/2" UNF are available in various colors. Individual color variants are packed and shipped randomly, so the color of the product received may differ from the one shown in the photo.

Color is not a primary technical selection criterion. Thread compatibility and the protective purpose of the product are most important.

Technical specification

Parameter	Value
Product name	Threaded plastic blanking plug / cap male thread 1/2" UNF
Product type	Protective blanking plug, plastic cap
Connection type	Male thread
Thread size	1/2" UNF
Standard designation	1/2"-20 UNF
Nominal thread diameter	12.7 mm
Standard thread pitch	20 TPI (1.27 mm)
Thread profile angle	60°
Material	Plastic
Operation under pressure	Not allowed
Color	Various colors, packed randomly
Application	Temporary protection of hydraulic connections against contamination

Frequently Asked Questions (FAQ)

What thread does the male thread 1/2" UNF blanking plug have?

The blanking plug has an imperial male thread designated as 1/2" UNF. The standard 1/2"-20 UNF thread has a nominal diameter of 12.7 mm and 20 threads per inch. Before installation, confirm the compatibility of the specific product's thread with the connection.

Does the 1/2" UNF plastic cap withstand hydraulic pressure?

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

What is the plastic blanking plug male thread 1/2" UNF used for?

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

Is 1/2" UNF thread the same as 1/2" BSP?

No. UNF and BSP threads belong to different systems and differ in geometry, diameter, and pitch. They should not be used interchangeably without confirming technical compatibility.

Can I choose the color of the blanking plug?

Blanking 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.