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Threaded plug M27X1.5 A PN-M-73124

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Threaded plug M27x1.5 A PN-M-73124

The M27x1.5 A PN-M-73124 threaded plug is a steel hydraulic blanking plug with a metric M27x1.5 external thread, designed for closing compatible ports with an internal thread. The product belongs to type A threaded plugs according to the Polish Standard PN-65/M-73124 and features a hexagonal head for wrench mounting.

The plug is made of free-cutting steel protected by zinc plating with white passivation. It is intended for blanking threaded ports in power hydraulic systems, including directional control valves, flow dividers, and appropriately adapted equipment bodies. The design does not have a factory-integrated seal or sealing cone. To create a tight connection, an appropriate sealing washer must be selected.

Technical parameters of the M27x1.5 A PN-M-73124 plug

Product type: threaded plug, hydraulic blanking plug.
Thread size: M27x1.5.
Thread type: external, metric fine.
Nominal thread diameter: 27 mm.
Thread pitch: 1.5 mm.
Version: A.
Series manufacturing standard: PN-65/M-73124.
Head type: hexagonal, external.
Mounting method: wrench for hexagonal head.
Material: free-cutting steel.
Surface protection: zinc plating with white passivation.
Factory seal: none.
Recommended sealing method: appropriately selected bonded seal or copper washer.
Purpose: blanking compatible ports with an M27x1.5 internal thread.

Application of the M27x1.5 threaded plug in power hydraulics

The M27x1.5 plug in version A is used for closing threaded ports in hydraulic system components. It can be used during machine assembly, system maintenance, component overhauls, and blanking unused connections.

Example applications include hydraulic directional control valves, flow dividers, appropriately adapted pump bodies, and other devices equipped with a compatible M27x1.5 port. Before installation, check the thread type, sealing surface, and permissible connection operating parameters.

M27x1.5 external thread – dimensions and identification

The M27x1.5 designation indicates a metric thread with a nominal diameter of 27 mm and a pitch of 1.5 mm. It is a fine-pitch thread used, among others, in hydraulic component connections.

When identifying the plug, measure the external diameter of the thread with a caliper and check the pitch with a metric thread gauge. The nominal diameter of 27 mm should not be equated with the exact result of every measurement of a finished thread, as actual dimensions are subject to manufacturing tolerances.

Version A according to PN-65/M-73124 standard

The plug is made in version A according to PN-65/M-73124, concerning threaded plugs used in hydraulic drives and controls. A characteristic feature of version A is the external hexagonal head, allowing for installation using a wrench.

Version A should be distinguished from version B, which is equipped with an internal hexagonal socket for an Allen key. Both designs differ in the way they are operated with a tool. When selecting, the available space around the connection should also be considered.

Sealing the M27x1.5 plug – copper washer or bonded seal

The M27x1.5 A plug does not have a factory-integrated seal or a conical sealing surface. To create a tight closure, a separate sealing element must be used, matched to the plug and the connection surface.

In this product group, copper washers and bonded seals (metal-rubber) are used, among others. The choice of a specific washer depends on the port geometry, contact surface, and system operating conditions. The washer should be selected so that it can properly seal the connection after installation.

The M27x1.5 metric thread turns themselves should not be considered a sufficient seal for a hydraulic port. Before starting the device, the tightness of the complete connection should be checked.

Free-cutting steel and zinc plating with white passivation

The plug belongs to a series of steel blanking plugs made of free-cutting steel and protected with a galvanic coating. Zinc plating with white passivation provides protection for the steel surface, limiting its susceptibility to corrosion.

When choosing a plug, the operating environment and material requirements of the specific hydraulic system should be considered. Galvanized finish should not be equated with stainless steel finish.

Hexagonal head – wrench-mounted plug

The M27x1.5 plug in version A has a hexagonal head designed for operation with an appropriately selected wrench. This solution allows for tightening and unscrewing the component during assembly and service work.

Before assembly, ensure tool access to the plug head. When tightening, the type of sealing washer used and the technical requirements of the mating connection must be taken into account. Do not exceed the permissible loads for the thread or sealing surface.

How to choose an M27x1.5 plug for a hydraulic port?

The primary criterion is the compatibility of the plug's external thread with the port's internal thread. Confirm the nominal diameter of M27 and the pitch of 1.5 mm, and also check the type of surface intended for the sealing washer.

When replacing a currently used blanking plug, it is worth comparing the version, head dimensions, mounting location design, and sealing method. The M27x1.5 plug is not automatically interchangeable with an M27x2 plug or a VSTI plug equipped with a factory ED seal.

Assembly and leakage control

Before assembly, turn off the device and safely depressurize the hydraulic system. Then, clean the port, check the thread condition, and inspect the surface intended for cooperation with the sealing washer.

After selecting the correct washer, screw the plug into the compatible M27x1.5 port and tighten according to the connection requirements. After completing the assembly, check for proper mounting and tightness. Before use under pressure, confirm the permissible operating parameters of the specific plug and the entire connection.

Technical specification

Parameter	Value
Product name	Threaded plug M27x1.5 A PN-M-73124
Product type	Plug / hydraulic blanking plug
Thread	External metric M27x1.5
Nominal thread diameter	27 mm
Thread pitch	1.5 mm
Version	A – hexagonal head
Series standard	PN-65/M-73124
Series material	Free-cutting steel
Surface protection	Zinc plating with white passivation
Factory seal	None
Connection sealing	Separately selected bonded seal or copper washer
Purpose	Blanking ports with an M27x1.5 internal thread

Frequently Asked Questions (FAQ)

What thread does the M27x1.5 A plug have?

The plug has an external metric M27x1.5 thread with a nominal diameter of 27 mm and a pitch of 1.5 mm.

What does version A according to PN-M-73124 mean?

Version A means it is made with an external hexagonal head, designed for installation using a wrench. Version B has a hexagonal socket for an Allen key.

Does the M27x1.5 plug have a seal?

No. The plug of this series does not have a factory seal. To seal the connection, an appropriate copper washer or bonded seal must be selected.

Where are PN-M-73124 plugs used?

The plugs are designed for blanking appropriate threaded ports, including in directional control valves, flow dividers, and other hydraulic components.

Can an M27x1.5 plug be replaced with an M27x2 plug?

No. Both plugs have a different thread pitch. Replacing without thread compatibility can damage the connection and prevent proper installation.

Is the M27x1.5 A plug the same as VSTI M27x1.5 ED?

No. The version A plug has a hexagonal head and requires a separately selected seal. The VSTI ED plug has an internal hexagonal socket and an elastomer seal. They should not be treated as automatically interchangeable.