205257

Name: Festo 205257 Union nut MCK-PK-4-R
Brand: Festo

Union nut MCK-PK-4-R

The Festo part number 205257 is an industrial component featuring an M8x1 internal thread and a pneumatic connection designed for 6 mm outside diameter pneumatic tubing or a barbed fitting with a 4 mm inside diameter and union nut. Featuring an anodized wrought aluminum alloy union nut, this RoHS compliant component operates at pressures ranging from -0.095 MPa to 1.2 MPa (-0.95 bar to 12 bar, -13.775 psi to 174 psi) across an ambient temperature range of -10 °C to 60 °C. It is rated for a corrosion resistance class (CRC) of 2 for moderate corrosion stress and conforms to VDMA24364-B2-L LABS (PWIS) standards. Submit the exact part number, quantity, and application requirements to request a quote.

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Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Festo references — within one business day.

Manufacturer: Festo
Part number: 205257
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Verified configuration

Technical Specifications

Size: Internal thread M8x1
Operating pressure for entire temperature range: -0.095 MPa...1.2 MPa | -0.95 bar...12 bar | -13.775 psi...174 psi
Corrosion resistance class (CRC): 2 - Moderate corrosion stress
LABS (PWIS) conformity: VDMA24364-B2-L
Ambient temperature: -10 °C...60 °C
Pneumatic connection 1: For pneumatic tubing outside diameter 6 mm | For barbed tting, inside diameter 4 mm, with union nut
Material of union nut: Wrought aluminum alloy, anodized
Note on materials: RoHS compliant

Engineering context

Identification and RFQ Guidance

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Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

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Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.

Technical verification

Our sourcing response is prepared against Festo 205257. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.