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Threaded Allen plug VSTI BSP 1/8" stainless

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Threaded Allen plug VSTI BSP 1/8" stainless

The VSTI BSP 1/8" threaded Allen plug in the stainless version is a specialized sealing element designed for permanent or temporary closing of internal connection ports in hydraulic and pneumatic systems. The component is used in pump bodies, valve blocks, manifolds, and process tanks exposed to direct contact with aggressive environments. The construction is based on a G 1/8" (BSP) cylindrical pipe thread and an internal hexagonal socket, which allows for quick installation in hard-to-reach working areas with surface flushing. Execution from high-grade AISI 316L (1.4404) stainless steel guarantees total resistance to corrosion, chemicals, and extreme temperature fluctuations. The product ensures absolute leak-tightness of the installation under high working pressure without the risk of medium contamination.

Application and technical characteristics

The VSTI G 1/8" stainless steel threaded blanking plug implements a metal-to-metal face seal or works with a dedicated edge seal (depending on the socket design). The element is mounted in sockets with a cylindrical internal thread in accordance with the DIN 3852-2 standard. Acid-resistant steel protects the connection against thread seizing and galling, facilitating service unscrewing even after many years of operation in marine, chemical, or food conditions.

Basic parameters and operational properties include:

Chemical and environmental resistance: Manufacturing from AISI 316L stainless steel ensures durability in contact with brine, acids, alkalis, and water vapor.
Pressure resistance: Reliable operation in installations under working pressure up to 400 bar (40 MPa).
Operating temperature range: Wide thermal tolerance from -60°C to +400°C (for metal-to-metal sealing).
Media compatibility: Synthetic and mineral oils, seawater, process chemicals, technical gases, glycols, and aggressive working fluids.
Assembly ergonomics: The Allen socket allows for tightening with appropriate torque without using open-end wrenches. When expanding corrosion-resistant circuits, the following may also prove useful: stainless steel connectors, specialized hydraulic hoses and reliable hydraulic valves.

Why choose HYDRON components?

HYDRON provides professional power hydraulics components manufactured under the regime of strict European DIN and ISO standards. Every VSTI 1/8" stainless plug undergoes detailed thread tolerance control and material consistency checks for the absence of micro-cracks. By choosing original HYDRON components, you gain the certainty of full dimensional compliance, maximum safety of system operation under load, and elimination of costly downtime caused by corrosion failures.

Technical specification

Parameter	Value
Element type	Threaded plug with Allen socket (VSTI)
Thread (G)	BSP 1/8" (G 1/8") – external cylindrical
Manufacturing standard	DIN 3852-2
Alternative designation / Replacement	VSTI 1/8 SS / VSTI-G1/8-SS / 1.4404 VSTI 1/8
Material	Acid-resistant stainless steel AISI 316L / 1.4404
Mounting socket	Hexagonal (Allen key / HEX)
Working pressure (PN)	400 bar / 40 MPa
Operating temperature range	-60°C to +400°C

Frequently Asked Questions (FAQ)

Where are stainless steel VSTI BSP 1/8" plugs used?

Stainless steel VSTI 1/8" plugs are used in industries with strict hygiene and environmental requirements, such as the food, chemical, pharmaceutical industries, offshore mining, and laboratory equipment construction. Their task is to plug unused measurement ports and technological channels.

How does the AISI 316L steel used in this plug differ from regular stainless steel?

AISI 316L steel (1.4404) contains an addition of molybdenum, which provides it with much higher resistance to pitting and crevice corrosion in environments containing chlorides (e.g., seawater) and in contact with aggressive acids compared to standard AISI 304 stainless steel.

Is Teflon tape required for installing the VSTI 1/8" stainless plug?

In the case of installation with a metal-to-metal face seal in a recessed socket according to DIN 3852, tape is not necessary; however, in low-pressure applications or in the absence of a face seat, PTFE tape or a dedicated FKM/PTFE seal matched to the medium can be used.