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Screw-in plastic plug / cap male thread 7/16" 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 thread 7/16" UNF

The plastic threaded plug male thread 7/16" UNF is a protective cap designed for the temporary protection of ports and hydraulic connections equipped with a compatible female thread. The product made of plastic features an imperial male thread and is used to protect hydraulic hoses, control valves, cylinders, and other components against dust, dirt, metal shavings, and other contaminants.

The plastic plug male thread 7/16" UNF is used during machine repairs, hose replacement, transport of parts, and storage of hydraulic components. It allows for the temporary protection of an open connection until the final connection is made. It is useful in workshops, hydraulic service centers, and industrial plants.

Important: the plastic plug male thread 7/16" UNF does not withstand pressure loads. It must not be used to close hydraulic or pneumatic installations operating under pressure.

Color information: the 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 plastic plug 7/16" UNF

Product type: protective plug, threaded plastic cap.
Connection type: Male thread.
Thread size: 7/16" UNF.
Standard thread designation: 7/16"-20 UNF.
Thread system: unified imperial, fine thread.
Nominal thread diameter: 11.1125 mm.
Standard number of threads: 20 TPI.
Standard thread pitch: 1.27 mm.
Standard UNF thread profile angle: 60°.
Material: plastic.
Purpose: temporary protection of threaded connections and ports.
Operation under pressure: inadmissible – the product does not withstand pressure loads.
Color: various colors, packed randomly.
Application: protection of hoses, control valves, cylinders, and other hydraulic components.

Application of the 7/16" UNF protective cap in power hydraulics

The plastic cap with 7/16" UNF male thread is used for temporary protection of hydraulic connections during service work, technical inspections, and hose replacement. It can be used to protect appropriately matched ports in control valves, cylinders, valves, and other installation components.

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

7/16"-20 UNF male thread – dimensions and identification

The 7/16" UNF thread belongs to the system of unified imperial fine threads. The standard designation 7/16"-20 UNF specifies a nominal diameter of 7/16 inch, which is 11.1125 mm, and 20 threads per inch. The thread pitch is 1.27 mm, and its profile angle is 60°.

In power hydraulics, the 7/16"-20 UNF thread is found in JIC 37° and ORFS connections, among others. However, it should be remembered that these systems differ in the method of sealing. The plastic plug is only a protective element and does not replace proper fittings or pressure plugs.

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

Protecting hydraulic hoses against contamination

When disconnecting hydraulic systems, open ports may be exposed to contact with dust, dirt, sand, and metal shavings. The plastic plug male thread 7/16" UNF allows for the temporary closure of a compatible port, reducing the risk of contaminants entering the component.

The cleanliness of hoses and components is essential for the durability of the hydraulic system. Contaminants entering the oil can cause accelerated wear of pumps, valves, control valves, and sealing elements.

Male thread 7/16" UNF plug for transport and storage

The 7/16" UNF plastic cap is useful during the transportation and storage of hydraulic parts. Temporarily closing a threaded port helps protect its interior from dust and accidental entry of foreign bodies.

The product can be used while preparing hoses and components for shipment, storage, and reassembly. Before starting the installation, the plastic plug must be removed and the final hydraulic connection must be made.

Plastic – protective construction

The male thread 7/16" UNF plug is made of plastic. Its task is to temporarily protect ports and threaded connections during transport, storage, and service work.

The plastic body is not designed to withstand pressure loads. During assembly, avoid excessive tightening, which may lead to deformation of the plug or damage to the thread.

Plastic plug vs hydraulic pressure plug

The plastic plug male thread 7/16" UNF is used to temporarily protect connections against contamination. It is not intended for maintaining working pressure and cannot replace a hydraulic plug designed for operation in a system under pressure.

If a connection must remain closed during device operation, a proper pressure plug with the appropriate thread, sealing method, and confirmed operating parameters must be used.

How to choose a plastic plug male thread 7/16" UNF?

Before purchasing, ensure that the port being protected has a compatible 7/16" UNF female thread. The standard 7/16"-20 UNF thread has a nominal diameter of 11.1125 mm and 20 threads per inch. The condition of the thread and the possibility of proper seating of the cap should also be checked.

The plug is suitable for protecting connections during transport, storage, and repairs. It is not suitable for closing an installation operating under pressure.

Assembly and disassembly of the 7/16" plastic cap

Before assembly, turn off the device, safely depressurize the hydraulic system, and clean the threaded port. Then, confirm the compatibility of the cap thread with the connection being protected.

The plug should be screwed in carefully, without using excessive force. If resistance occurs during assembly, stop screwing and recheck the thread fit. Before starting the installation, the plastic cap must be removed.

Various colors – random packing

The plastic plugs male thread 7/16" UNF are available in various colors. Individual color variants are packed and shipped randomly, so the color of the delivered plug may differ from the one shown in the photo.

Color is not the primary selection criterion. The most important factors are thread compatibility and the protective purpose of the product.

Technical specification

Parameter	Value
Product name	Threaded plastic plug / cap male thread 7/16" UNF
Product type	Protective plug, plastic cap
Connection type	Male thread
Thread size	7/16" UNF
Standard designation	7/16"-20 UNF
Nominal thread diameter	11.1125 mm
Standard thread pitch	20 TPI (1.27 mm)
Thread profile angle	60°
Material	Plastic
Operation under pressure	Inadmissible
Color	Various colors, packed randomly
Application	Temporary protection of hydraulic connections against contamination

Frequently Asked Questions (FAQ)

What thread does the plastic plug male thread 7/16" UNF have?

The plug is designated as male thread 7/16" UNF. The standard 7/16"-20 UNF thread has a nominal diameter of 11.1125 mm and 20 threads per inch. Before installation, confirm the compatibility of the specific product's thread with the connection.

Does the 7/16" 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 plug male thread 7/16" 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 the 7/16" UNF thread used in JIC connections?

Yes. The 7/16"-20 UNF thread is found, among others, in JIC 37° hydraulic connections. However, this does not mean that the plastic protective plug is suitable for sealing such a connection under pressure.