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Threaded hex socket plug VSTI BSP 1.1/4" ED seal

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€6.47

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Threaded hex socket plug VSTI BSP 1.1/4" ED

The VSTI BSP 1.1/4" ED threaded plug is a specialized closing element designed for permanent or temporary blanking of internal connection ports in hydraulic power systems. It is used in valve blocks, pump bodies, manifolds, and oil tanks of industrial equipment and mobile machinery. The component's construction utilizes a cylindrical G 1.1/4" (BSP) pipe thread and an axial sealing ring made of NBR elastomer (ED type E seal according to DIN 3852-11). The hexagonal socket for an Allen key allows for precise installation in designated technological holes, ensuring perfect flush with the body surface. The element is manufactured from structural steel protected with an anti-corrosive zinc coating, which guarantees full mechanical reliability under high working pressure.

Application and technical characteristics

The VSTI G 1.1/4" ED threaded blanking plug provides a face-type surface seal. Once the plug is screwed into the connection port, the integrated ED soft seal undergoes axial deformation in a dedicated thread undercut, creating a barrier that prevents the leakage of working fluid. This design provides very good resistance to pressure surges and vibrations occurring in hydraulic systems.

The basic properties and operating parameters of the element include:

Sealing standard: ED flexible face seal in accordance with DIN 3852-11 (Type E).
Pressure resistance: Maximum working pressure up to 315 bar (31.5 MPa).
Media compatibility: Mineral oils, synthetic oils, glycols, and water solutions used in pressure drives.
Temperature range: Safe operation within the range of -35°C to +100°C (for the standard NBR seal).
Corrosion protection: Passivated zinc coating protecting the steel surface against moisture.
Installation in narrow spaces: The internal hex socket allows for tightening the element in places where access for flat wrenches is limited. For the comprehensive assembly of hydraulic circuits, the following may also be useful: hydraulic adapters, durable hydraulic hoses and reliable threaded connectors.

Why choose HYDRON components?

HYDRON provides hydraulic components that meet the strict requirements of European ISO and DIN standards. Every VSTI 1.1/4" ED plug undergoes detailed verification of thread tolerances and the dimensions of the flexible seal seat. This guarantees the correct proportions of the connection, zero micro-leakages, and trouble-free operation of systems in difficult environmental and operating conditions. By choosing HYDRON solutions, you gain confidence in material durability and technical consistency.

Technical specification

Parameter	Value
Element type	Threaded plug with hex socket (VSTI)
Thread (G)	BSP 1.1/4" (G 1.1/4") – external cylindrical
Sealing type	ED soft seal (NBR) – DIN 3852-11 Type E
Alternative designation / Replacement	VSTI 1.1/4 ED / VSTI-G1.1/4-ED / VSTI11/4ED
Material	Carbon structural steel, galvanized
Mounting socket	Hexagonal (Allen key / HEX)
Working pressure (PN)	315 bar / 31.5 MPa
Operating temperature range	-35°C to +100°C

Frequently Asked Questions (FAQ)

Are additional sealants required for the installation of the VSTI 1.1/4" ED plug?

No. The plug features a factory ED sealing ring made of NBR rubber, which provides face sealing when tightened with the appropriate torque. Applying Teflon tape, hemp, or liquid sealants to the cylindrical thread turns is an assembly error that can hinder the proper seating of the flexible seal.

What is the main advantage of using an ED seal compared to tapered connections?

The ED type seal relies on a flexible ring that enters the cylindrical thread undercut and fits against the flat surface of the seat. This eliminates the risk of body cracking due to hoop forces that occur when screwing in components with tapered threads (e.g., NPT or BSPT).

Is the ED sealing ring in the VSTI plug a replaceable part?

Yes. The integrated NBR flexible seal can be removed in the event of physical wear or thermal aging and replaced with a new ED ring of the appropriate size. This allows for the safe, multiple reuse of the steel plug body.