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Plastic screw-in cap / plug Male 3/4" 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 cap / plug Male 3/4" UNF

The plastic threaded cap Male 3/4" UNF is a protective plug with an external inch thread, designed for temporary protection of holes and hydraulic connections with a compatible female thread. Made of plastic, the cap helps protect hydraulic hoses, manifolds, cylinders, and other components against dust, dirt, metal shavings, and contaminants during transport, storage, repairs, and assembly.

The plastic Male 3/4" UNF plug allows for temporary closing of a properly matched threaded hole until the target hydraulic connection is made. It is useful during hose replacement, machine servicing, and storage of hydraulic components that require protection against contamination.

Important: the plastic Male 3/4" UNF cap does not carry pressure loads. It must not be used for closing 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 received cap may differ from the one shown in the photo.

Technical parameters of the 3/4" UNF plastic cap

Product type: protective cap, plastic threaded plug.
Connection type: Male – external thread.
Thread size: 3/4" UNF.
Standard thread marking: 3/4"-16 UNF.
Thread system: unified inch, fine thread.
Standard nominal thread diameter: 19.05 mm.
Standard number of threads: 16 TPI.
Standard thread pitch: approximately 1.588 mm.
Standard UNF thread profile angle: 60°.
Material: plastic.
Purpose: temporary protection of threaded holes and connections.
Pressure resistance: the product does not carry pressure loads.
Color: various colors, randomly packed.
Application: protection of hoses, manifolds, cylinders, and other hydraulic components.

Application of the 3/4" UNF protective plug in power hydraulics

The plastic Male 3/4" UNF threaded plug is used for temporary protection of open connections during service work, technical inspections, and replacement of hydraulic hoses. It can be used in compatible openings of manifolds, cylinders, valves, and other installation elements.

The cap helps limit the entry of contaminants into the interior of the component when a hose has been disconnected or the device is being prepared for repair. It serves a protective function and is not a sealing element of the system during its operation.

External thread 3/4"-16 UNF – dimensions and identification

The 3/4" UNF thread belongs to the unified inch fine thread system. The standard 3/4"-16 UNF designation specifies a nominal diameter of 3/4 inch, i.e. 19.05 mm, and 16 threads per inch. This corresponds to a pitch of approximately 1.588 mm.

The UNF thread has a profile angle of 60°. The 3/4"-16 UNF size is found, among others, in JIC 37° and ORFS hydraulic connections. However, please remember that these systems differ in their sealing method, and a plastic protective plug does not replace proper fittings or pressure plugs.

A caliper and an inch thread gauge can be used to identify the thread. Before assembly, verify the compatibility of the diameter and number of threads per inch with the connection being protected.

Protection of hydraulic hoses against contamination

During repairs of hydraulic systems, open hoses and connections are exposed to contact with dust, dirt, sand, and metal shavings. The plastic Male 3/4" UNF cap allows for temporary closure of a compatible hole, helping to limit the ingress of contaminants into the element.

Maintaining the cleanliness of hoses and components is important for the durability of power hydraulics. Contaminants present in the hydraulic oil can accelerate the wear of pumps, valves, manifolds, and sealing elements.

Male 3/4" UNF cap for transport and storage

The 3/4" UNF plastic plug is useful during the transport and storage of hydraulic parts. Temporary closure of a threaded hole helps protect its interior from dust and accidental entry of foreign bodies.

The product can be used while preparing hoses and components for shipping, storage in a warehouse, and reassembly. Before starting the system, the protective cap must be removed and the target hydraulic connection must be made.

Plastic – construction of the protective cap

The Male 3/4" UNF cap is made of plastic. Its primary task is to protect threaded connections from contamination during transport, storage, and service work.

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

Plastic cap vs. hydraulic pressure plug

The plastic Male 3/4" UNF plug is a protective element designed for temporary protection of connections. It cannot replace a hydraulic plug, whose task is to maintain working pressure during system operation.

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

How to choose a plastic Male 3/4" UNF cap?

Before purchasing, ensure that the protected hole has a compatible 3/4" UNF female thread. The standard 3/4"-16 UNF thread has a nominal diameter of 19.05 mm and 16 threads per inch. Before assembly, confirm the compatibility of the actual cap thread with the connection.

The cap is for temporary protection against contamination during transport, storage, and repairs only. It cannot be used in a system operating under pressure.

Assembly and disassembly of the 3/4" plastic plug

Before assembly, turn off the device, safely depressurize the hydraulic system, and clean the threaded hole. Then check the compatibility of the plug thread with the protected connection.

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

Various colors – random packing

Plastic Male 3/4" UNF caps are available in various colors. Individual color variants are packed and shipped randomly, therefore the color of the delivered product 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 cap are most important.

Technical specification

Parameter	Value
Product name	Plastic threaded cap / plug Male 3/4" UNF
Product type	Protective cap, plastic plug
Connection type	Male – external thread
Thread size	3/4" UNF
Standard marking	3/4"-16 UNF
Nominal thread diameter	19.05 mm
Standard thread pitch	16 TPI (approx. 1.588 mm)
Thread profile angle	60°
Material	Plastic
Working under pressure	Not allowed
Color	Various colors, randomly packed
Application	Temporary protection of hydraulic connections against contamination

Frequently Asked Questions (FAQ)

What thread does the plastic Male 3/4" UNF cap have?

The cap is marked as Male 3/4" UNF. Standard 3/4"-16 UNF thread has a nominal diameter of 19.05 mm and 16 threads per inch. Before assembly, check the compatibility of the specific product's thread with the protected connection.

Does the 3/4" UNF 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 plastic Male 3/4" UNF cap used for?

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

Is the 3/4" UNF thread used in JIC connections?

Yes. The 3/4"-16 UNF thread is found in JIC 37° hydraulic connections, among others. However, the plastic protective cap is not intended for sealing such a connection under pressure.