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Ball Nipple for Welding 16-6 PN-138 8L

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Ball Nipple for Welding 16-6 PN-138 8L

The Ball Nipple for Welding 16-6 PN-138 8L is a hydraulic fitting component designed for connecting pipes in hydraulic oil systems. The product is made of free-cutting steel and protected with an anti-corrosion zinc layer with white passivation. The characteristic ball end allows it to work with a properly selected connector socket, while the other part of the component is intended for a welded connection.

The nipple was manufactured according to the Polish Standard PN-65/M-73138 and has the designation 16-6 PN-138 8L. It belongs to the L light series, for which a pressure of up to 16 MPa (160 bar) is specified. The product is used in the construction, repair, and modernization of power hydraulics systems where a permanent welded connection and cooperation with disconnectable pipe fittings are necessary.

Technical parameters of the PN-138 16-6 ball nipple

Product type: ball nipple for welding.
Full product designation: 16-6 PN-138 8L.
English name: Ball Nipple for Welding.
Manufacturing standard: PN-65/M-73138.
Standard designation: PN-138.
Series: L – light.
Pressure for L series: up to 16 MPa (160 bar).
Material: free-cutting steel.
Protective coating: zinc with white passivation.
End type: ball.
Assembly method: welding.
Intended use: connections in hydraulic oil systems.

Application of the 16-6 ball nipple in power hydraulics

The PN-138 16-6 ball nipple is intended for making connections of steel pipes used in hydraulic oil systems. Such solutions are used in installations of industrial machines, agricultural and construction equipment, hydraulic power units, and technological systems equipped with appropriate connection fittings.

The component enables a permanent welded end, which on the ball side can work with a compatible connector. Such a connection allows for designing the installation in a way that enables the disassembly of selected pipe sections during service work. The application possibilities of the nipple are determined by the pipe dimensions, connector design, and operating parameters of the entire system.

Structure and principle of operation of the ball end

The nipple has a spherical surface intended for cooperation with a properly matched socket. During assembly, the connection components are pressed together using appropriately selected fittings. Correct matching of the cooperating surfaces is essential for the tightness and durability of the joint.

The opposite part of the nipple is intended to be welded into a properly prepared pipe. This creates a connection that combines the durability of the welded part with the possibility of disconnecting the matched joint on the ball side. The tightness of the entire system depends on the quality of the weld, compatibility of the elements, and correct installation.

Standard PN-65/M-73138 and designation 16-6 PN-138 8L

The product was manufactured according to the Polish Standard PN-65/M-73138. The full designation 16-6 PN-138 8L is used to identify the appropriate variant of the nipple when completing the installation and ordering spare parts. When choosing, all parts of the designation must be maintained, especially the 8L symbol.

Similarly looking ball nipples may differ in the dimensions of the welded part and cooperating surfaces. For this reason, before assembly, the dimensions of the selected variant should be compared with the documentation of the pipe and the rest of the hydraulic fittings.

Light series L – pressure up to 16 MPa

The ball nipple 16-6 PN-138 8L belongs to the light L series. According to the technical data of this product family, the L series is intended for pressures up to 16 MPa, which is 160 bar. There is also a heavy S series, for which a pressure of up to 32 MPa (320 bar) is provided, but this is not a parameter of the described 8L variant.

The allowable working pressure of the finished connection should be determined taking into account the pipe, material, and quality of the weld, as well as the parameters of the cooperating fittings. The value assigned to the manufacturing series does not replace the strength assessment of the complete hydraulic system.

Free-cutting steel and corrosion protection

The nipple was made of free-cutting steel, and its surface is covered with a zinc layer with white passivation. This coating limits the corrosion of the component under appropriate storage and operating conditions. It provides protection for the metal surface against the influence of moisture and selected environmental factors.

Due to its intended use for welding, it is necessary to properly prepare the surface at the welding site. When welding galvanized components, the coating should be removed from the joint area, and appropriate protective measures and ventilation should be used. After work is completed, the weld area should be protected against corrosion.

Selection of a ball nipple for a hydraulic pipe

Before choosing the PN-138 16-6 8L nipple, check the pipe dimensions and structural compatibility of the connection elements. The diameter and wall thickness of the pipe, the geometry of the part intended for welding, and the profile of the ball end are all significant.

The selection of the cooperating socket and nut should be based on the dimensional documentation of the appropriate system. Do not treat all ball nipples with similar designations as interchangeable. When repairing an existing installation, it is recommended to compare the full designation with the previously installed component.

Installation and welding of the PN-138 8L nipple

Before starting the installation, the hydraulic system should be safely depressurized and the technical condition of the nipple checked. Surfaces intended for welding should be cleaned and properly prepared. The nipple should be positioned coaxially with the pipe to avoid unwanted stress and deformation.

Welding should be carried out according to the technology selected for the actual material and joint construction. The ball surface should be protected against splashes and mechanical damage. After installation, it is necessary to clean the inside of the pipe, inspect the quality of the weld, and check the system for tightness.

Main features of the 16-6 PN-138 8L ball nipple

Manufactured according to the Polish Standard PN-65/M-73138.
Full designation: 16-6 PN-138 8L.
Designed for making welded connections.
Ball end cooperating with an appropriate socket.
Material: free-cutting steel.
Corrosion protection: zinc with white passivation.
Light L series – up to 16 MPa (160 bar).
Application in hydraulic oil systems.
Suitability during construction and servicing of pipe installations.

Technical specification

Parameter	Value
Product type	Ball nipple for welding
Designation	16-6 PN-138 8L
Manufacturing standard	PN-65/M-73138
Series	L – light
L series pressure	Up to 16 MPa (160 bar)
Material	Free-cutting steel
Coating	Zinc with white passivation
End type	Ball
Assembly	Welding
Application	Hydraulic oil systems

Frequently Asked Questions (FAQ)

What is the 16-6 PN-138 8L ball nipple used for?

The nipple is used for making pipe connections in hydraulic oil systems. It is intended for welding and cooperation with a properly selected connector.

According to which standard was the nipple manufactured?

The product was manufactured according to the Polish Standard PN-65/M-73138.

What pressure is provided for the L series?

For the light L series, the pressure is specified up to 16 MPa (160 bar). The permissible parameters of the finished connection also depend on the other elements of the installation.