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Plastic screw-in blanking plug / cap male thread 7/8" 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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Plastic threaded blanking plug / cap male thread 7/8" UNF

Plastic threaded blanking plug male thread 7/8" UNF is a protective cap with an imperial male thread, designed for temporary protection of hydraulic ports and connections. Made of plastic, the plug helps protect the interior of hoses, valves, cylinders, and other components from dust, dirt, metal shavings, and contamination during repairs, transport, and storage.

The 7/8" UNF plastic cap allows for temporary closure of a connection with a compatible female thread. It is useful when replacing hydraulic hoses, servicing machines, and preparing components for storage or shipping. The threaded design helps keep the plug in the protected port until the final connection is made.

Important: the plastic male thread 7/8" UNF blanking plug does not bear pressure loads. It must not be used to close hydraulic or pneumatic installations operating under pressure.

Color information: blanking 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 7/8" UNF plastic blanking plug

Product type: protective blanking plug, threaded plastic cap.
Connection type: male thread – male thread.
Thread size: 7/8" UNF.
Standard thread designation: 7/8"-14 UNF.
Thread system: unified imperial, fine thread.
Nominal thread diameter: 22,225 mm.
Standard number of threads: 14 TPI.
Standard thread pitch: approx. 1,814 mm.
Standard UNF thread profile angle: 60°.
Material: plastic.
Purpose: temporary protection of threaded holes and connections.
Pressure operation: not allowed.
Color: various colors, packed randomly.
Application: protection of hoses, valves, cylinders, and other hydraulic components.

Application of the 7/8" UNF protective cap in hydraulic power systems

The plastic threaded cap male thread 7/8" UNF is intended for temporary protection of open connections during service work, technical inspections, and replacement of hydraulic hoses. It can be used in compatible ports of valves, cylinders, valves, and other elements of the hydraulic system.

The blanking plug helps limit the access of contaminants to the interior of the component when the hose has been disconnected or the element has been prepared for repair. The product serves a protective function and is not intended for sealing the installation during its operation.

Male thread 7/8"-14 UNF – dimensions and identification

The 7/8" UNF thread belongs to the unified imperial fine thread system. The standard designation 7/8"-14 UNF indicates a nominal diameter of 7/8 inch, which is 22,225 mm, and 14 threads per inch. The thread pitch is approximately 1,814 mm, and its profile angle is 60°.

The 7/8"-14 UNF thread is used, among others, in JIC 37° and ORFS hydraulic connections. These systems differ in the method of sealing, so thread compatibility alone does not mean connections are interchangeable. The plastic protective plug does not replace the proper sealing element or a cap designed for pressure operation.

A caliper and an imperial thread gauge can be used to identify the thread. Before installation, check the compatibility of the diameter and the number of threads per inch to avoid damaging the cap thread or the protected connection.

Protecting hydraulic hoses from contamination

During repairs of hydraulic systems, open hoses and connections are exposed to contact with dust, dirt, sand, and metal shavings. The plastic male thread 7/8" UNF blanking plug allows for temporary closure of a compatible hole, helping to limit the penetration of these contaminants into the element.

Maintaining the cleanliness of hoses and components is important for the durability of hydraulic power systems. Contaminants entering the oil can accelerate the wear of pumps, valves, distributors, and sealing elements. Using protective plugs during servicing helps reduce this risk.

Male thread 7/8" UNF blanking plug for transport and storage

The 7/8" UNF plastic cap is useful when transporting and storing hydraulic parts. Temporary closure of the threaded hole helps protect its interior from dust and accidental entry of foreign bodies.

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

Plastic – construction of the protective blanking plug

The male thread 7/8" UNF blanking plug is made of plastic. Its primary task is to protect threaded holes during transport, storage, and service work.

The plastic cap is not designed to withstand pressure loads. During installation, avoid excessive tightening, which could cause deformation of the body or damage to the blanking plug's thread.

Plastic blanking plug vs. pressure hydraulic cap

The plastic cap male thread 7/8" UNF is a protective element used for temporary protection of connections against contamination. It cannot replace a hydraulic cap, whose task is to close an installation operating under pressure.

If the connection is to remain closed during device operation, a proper pressure cap with confirmed operating parameters, appropriate thread, and sealing method must be used. Thread size compatibility alone does not mean the plastic blanking plug is suitable for such application.

How to choose a plastic male thread 7/8" UNF blanking plug?

Before purchasing, make sure that the protected hole has a compatible 7/8" UNF female thread. The standard 7/8"-14 UNF thread has a nominal diameter of 22,225 mm and 14 threads per inch. Before installation, confirm the compatibility of the actual plug thread with the connection.

The product is intended exclusively for temporary protection against dirt during transport, storage, and repairs. It cannot be used to close a hydraulic system under pressure.

Installation and removal of the 7/8" plastic cap

Before installation, turn off the device, safely depressurize the hydraulic system, and clean the threaded hole. Then check if the blanking plug's thread corresponds to the thread of the protected connection.

The cap should be screwed in carefully, without excessive force. If significant resistance occurs during installation, stop screwing and re-check the thread compatibility. Before starting the installation, the plastic blanking plug must be removed.

Various colors – random packing

Plastic male thread 7/8" UNF blanking plugs are available in various colors. Color variants are packed and shipped randomly, so the color of the received product may differ from the one shown in the photo.

Color is not a basic technical selection criterion. Thread compatibility and the protective purpose of the blanking plug are the most important.

Technical specification

Parameter	Value
Product name	Plastic threaded blanking plug / cap male thread 7/8" UNF
Product type	Protective blanking plug, plastic cap
Connection type	Male thread – male thread
Thread size	7/8" UNF
Standard designation	7/8"-14 UNF
Nominal thread diameter	22,225 mm
Standard thread pitch	14 TPI (approx. 1,814 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 male thread 7/8" UNF blanking plug have?

The blanking plug is designated as male thread 7/8" UNF. The standard 7/8"-14 UNF thread has a nominal diameter of 22,225 mm and 14 threads per inch. Before installation, confirm the thread compatibility of the specific product with the connection.

Does the 7/8" UNF plastic cap withstand hydraulic pressure?

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

What is the plastic male thread 7/8" UNF blanking plug used for?

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

Is the 7/8" UNF thread used in JIC and ORFS connections?

Yes. The 7/8"-14 UNF thread appears in some JIC 37° and ORFS hydraulic connections. However, these systems have different sealing methods, and the plastic blanking plug is not intended for pressure operation.

Can I choose the color of the blanking plug?

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