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Ball nipple for welding 16-4 PN-138 6L

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Ball nipple for welding 16-4 PN-138 6L

The 16-4 PN-138 6L ball nipple for welding is a hydraulic fitting component designed for making pipe connections in oil systems. The product is made of free-cutting steel, and its surface is protected with a zinc layer with white passivation. The characteristic ball end allows it to work with a properly selected connector socket, while the opposite part of the component is intended for a welded connection.

The nipple was made according to the Polish Standard PN-65/M-73138. The 16-4 PN-138 6L designation identifies a specific variant belonging to the light L series, for which a pressure of up to 16 MPa (160 bar) is specified. The component is used during the construction, repair, and modernization of power hydraulic systems utilizing rigid steel pipes.

Technical parameters of the ball nipple 16-4 PN-138 6L

Product type: ball nipple for welding.
Full designation: 16-4 PN-138 6L.
English name: Ball Nipple for Welding.
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 plated with white passivation.
End type: ball.
Assembly method: welding.
Intended use: hydraulic oil systems.

Application of the PN-138 6L ball nipple in power hydraulics

The 16-4 PN-138 6L ball nipple is intended for making connections of steel pipes in hydraulic systems. Components of this type are used in oil systems of industrial machines, agricultural and construction equipment, hydraulic power units, and technological systems equipped with properly selected fittings.

The design of the nipple allows for a durable welded connection with a steel pipe and cooperation with a detachable connection on the ball side. This allows the installation to include points for dismantling selected elements during service activities. The condition for correct operation is the compatibility of dimensions and geometry of all cooperating parts.

Construction and principle of operation of the ball nipple

The nipple has a properly shaped ball end intended for cooperation with a matching hydraulic connector socket. During assembly, the cooperating surfaces are pressed together using appropriately selected connection elements. Proper geometry and surface condition are essential for the tightness of the joint.

The second part of the nipple is intended for welding into a steel pipe. Making the connection requires adhering to the correct welding technology, proper positioning of the elements, and quality control of the weld. The tightness of the finished assembly depends on both the welded connection and the correct fit of the ball end.

PN-65/M-73138 standard and 16-4 PN-138 6L designation

The product was made according to the Polish Standard PN-65/M-73138, concerning this family of ball nipples. The full designation 16-4 PN-138 6L allows for identifying the appropriate variant when ordering fittings, completing connections, and repairing existing systems.

The 6L symbol is an important part of the commercial designation. When selecting cooperating elements, use the full designation and appropriate dimensional documentation. Similar-looking nipples may differ in the geometry of the ball part, dimensions of the welded area, and requirements for the cooperating fittings.

Light series L – pressure up to 16 MPa (160 bar)

The 16-4 PN-138 6L nipple belongs to the light series L, for which a pressure of up to 16 MPa, i.e., 160 bar, is specified. This family of products also includes heavy series S variants, intended for pressures up to 32 MPa (320 bar). However, these are separate designs whose parameters should not be used interchangeably.

When designing the installation, remember that the allowable pressure of the entire connection also depends on the parameters of the pipe, the strength of the weld, and the fittings used. The value assigned to the production series does not replace a compatibility check of all hydraulic system components.

Free-cutting steel and zinc plated with white passivation

The PN-138 6L ball nipple is made of free-cutting steel. The surface of the element is protected by zinc with white passivation, which reduces the risk of corrosion during storage and use under conditions suitable for this type of coating.

Due to the intended use for welding, the area where the weld is made must be properly prepared. The zinc coating requires removal from the connection point according to the adopted technology. During work, ensure effective ventilation and protection against welding fumes. After welding, the exposed surface must be re-protected against corrosion.

Selection of a ball nipple for a hydraulic pipe

Before installing the 16-4 PN-138 6L nipple, check the compatibility of its dimensions with the pipe and other connection elements. The dimensions of the part intended for welding, the profile of the ball end, and the geometry of the matching socket are important. Selection should also take into account requirements for operating pressure and installation operating conditions.

When replacing a nipple in an existing installation, it is recommended to compare the full designation with the technical documentation. Do not treat the mere compatibility of diameter or similar appearance of elements as confirmation of their interchangeability.

Preparation and welding of the PN-138 6L nipple

Before making the connection, safely depressurize the hydraulic system and prepare the steel pipe. The surfaces intended for welding should be cleaned, and the nipple properly positioned relative to the pipe axis. Avoid installation that causes unwanted stresses or deformations of the components.

Welding should be performed by a qualified person, according to the technology appropriate for the material and design of the connection. The ball mating surface should be protected against spatter, dirt, and mechanical damage. After completing the work, clean the inside of the pipe, check the quality of the weld, and perform the required leak test.

Key features of the 16-4 PN-138 6L ball nipple

Execution according to Polish Standard PN-65/M-73138.
Full product designation: 16-4 PN-138 6L.
Intended for welded connections.
Ball end cooperating with a matching socket.
Material: free-cutting steel.
Anti-corrosion coating: zinc plated with white passivation.
Light series L – up to 16 MPa (160 bar).
Application in hydraulic oil systems.
Suitability during assembly and repair of pipe systems.

Technical specification

Parameter	Value
Product type	Ball nipple for welding
Designation	16-4 PN-138 6L
Standard	PN-65/M-73138
Series	L – light
Pressure for L series	Up to 16 MPa (160 bar)
Material	Free-cutting steel
Coating	Zinc plated with white passivation
End	Ball
Assembly	Welding
Application	Hydraulic oil systems

Frequently Asked Questions (FAQ)

What is the 16-4 PN-138 6L ball nipple used for?

It is used for making pipe connections in hydraulic oil systems. It has a ball end and a part intended for welding.

According to which standard was the ball nipple made?

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

What pressure is intended for the light L series?

The light L series is intended for pressures up to 16 MPa (160 bar). The allowable parameters of the complete connection also depend on the other installation elements.