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Ball nipple for welding 16-8 PN-138 10L/S

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Ball nipple for welding 16-8 PN-138 10L/S

The ball nipple for welding 16-8 PN-138 10L/S is a fitting element designed for connecting pipe lines in hydraulic oil systems. The product is made of free-cutting steel and protected with an anti-corrosion layer of white zinc with passivation. The characteristic spherical end allows for cooperation with a properly selected connector socket, while the part intended for welding allows for a permanent connection with a steel pipe.

The nipple belongs to a family of elements manufactured according to the Polish Standard PN-65/M-73138, also referred to as PN-138. This group of products includes light L versions, designed for pressures up to 16 MPa (160 bar), and heavy S versions, designed for up to 32 MPa (320 bar). Selecting the correct version requires considering the product designation and the parameters of the entire connection.

Technical parameters of the ball nipple PN-138 16-8

Product type: ball nipple for welding.
Full designation: 16-8 PN-138 10L/S.
English name: Ball Nipple for Welding.
Manufacturing standard: PN-65/M-73138.
Standard designation: PN-138.
Material: free-cutting steel.
Corrosion protection: white zinc plating with passivation.
End type: spherical.
Mounting method: welding.
Light series L: up to 16 MPa (160 bar).
Heavy series S: up to 32 MPa (320 bar).
Purpose: pipe connections in hydraulic oil systems.

Application of the ball nipple in power hydraulics

The PN-138 16-8 ball nipple is designed for making connections in hydraulic installations using oil as the working medium. Elements of this type are used during the construction and repair of rigid pipe lines, where a welded connection is required on one side and cooperation with appropriate fittings on the spherical end side.

These solutions can be used in industrial machinery, construction and agricultural equipment, hydraulic power units, and technological installations. The feasibility of application is determined by the pipe dimensions, the design of the mating connector, and the required operating parameters of the entire system.

Design and function of the spherical end

A characteristic element of the design is the spherical surface intended for cooperation with a properly profiled socket. The connection requires correct matching of the mating surfaces and the use of appropriate clamping elements. The other part of the nipple is used to make a welded connection with a properly selected pipe.

Using such a solution allows for a permanent pipe end while maintaining the possibility of disconnecting a properly designed connector on the spherical side. Tightness depends on the geometry of the mating surfaces, the quality of the weld, and correct assembly.

Standard PN-65/M-73138 and designation 10L/S

The nipple is specified by the designation 16-8 PN-138 10L/S. The PN-65/M-73138 standard forms the basis for identifying this family of elements. The full product symbol should be taken into account when ordering parts, selecting mating fittings, and comparing elements used in existing hydraulic installations.

The designation 10L/S must be retained when identifying the variant, as the term PN-138 16-8 alone does not contain all the information provided in the product's trade name. Before selecting mating elements, the appropriate series, dimensions, and structural compatibility of the connection must be confirmed.

Ball nipples of light L and heavy S series

There are two design groups in the family of ball nipples for welding. The light L series is intended for pressure up to 16 MPa (160 bar), while the heavy S series is for pressure up to 32 MPa (320 bar). This distinction is important when selecting elements for hydraulic systems operating under different load conditions.

The pressure values of individual series should not be automatically equated with the allowable pressure of each complete connection. When designing an installation, the parameters of the pipe, the weld, and other fittings must also be considered. Elements of different designs should not be used interchangeably without confirming their compatibility.

Free-cutting steel and white zinc with passivation

The ball nipple is made of free-cutting steel. Its surface has been covered with a layer of white zinc with passivation, providing corrosion protection. The coating limits the influence of moisture and environmental factors under conditions suitable for the protection used.

Since the element is intended for welding, the area where the weld is performed requires appropriate preparation. The zinc coating should be removed from the welding site in accordance with the adopted technology, and after completing the work, the exposed area should be protected against corrosion. Proper ventilation and protection against harmful fumes are essential during welding.

Selecting a ball nipple for a hydraulic pipe

Before choosing the 16-8 PN-138 10L/S ball nipple, verify the compatibility of its dimensions with the pipe and the screw connection elements. The diameter and wall thickness of the pipe, the geometry of the part intended for welding, and the profile of the spherical surface mating with the socket are all important.

When repairing an existing system, it is recommended to compare the full designation of the nipple with the technical documentation of the installation. A similar appearance alone does not ensure dimensional compatibility or proper tightness. Proper selection helps reduce the risk of connection failure during assembly and operation.

Preparation and assembly of the welding nipple

Before making the connection, check the condition of the nipple surface, prepare the steel pipe, and verify the dimensional compatibility of both elements. The nipple should be positioned correctly relative to the pipeline axis to reduce stresses and deformations occurring during assembly.

Welding should be performed by a qualified worker, in accordance with the technology selected for the material and installation requirements. The spherical surface should be protected from welding spatter and damage. After completing the work, it is necessary to clean the inside of the pipe, inspect the weld, and check the tightness of the entire connection.

Key features of the ball nipple PN-138 10L/S

Manufactured according to Polish Standard PN-65/M-73138.
Full designation: 16-8 PN-138 10L/S.
Intended for welding.
Spherical surface mating with the connector.
Made of free-cutting steel.
Surface protected by white zinc with passivation.
Application in hydraulic oil systems.
Can be used during the assembly and repair of pipe installations.

Technical specification

Parameter	Value
Product	Ball nipple for welding
Designation	16-8 PN-138 10L/S
Standard	PN-65/M-73138
Material	Free-cutting steel
Coating	White zinc with passivation
Pressure L series	Up to 16 MPa (160 bar)
Pressure S series	Up to 32 MPa (320 bar)
Assembly	Welding
Purpose	Hydraulic oil systems

Frequently Asked Questions (FAQ)

What is the ball nipple 16-8 PN-138 10L/S used for?

It is intended for making pipe connections in hydraulic oil systems. It features a spherical end and a part prepared for welding.

According to which standard was the nipple manufactured?

The product was manufactured according to the Polish Standard PN-65/M-73138, also designated as PN-138.

What pressure does the light L series allow?

According to the data provided, the light L series is intended for pressure up to 16 MPa (160 bar). The heavy S series is a separate group, for which 32 MPa (320 bar) is specified.

What material is the nipple made of?

The nipple is made of free-cutting steel and protected by white zinc plating with passivation.

What should be considered when selecting the 10L/S nipple?

Check the full product designation, dimensions of the welding part, the profile of the spherical end, and compatibility with other installation components.