531639

Name: Festo 531639 Quick coupling socket KD4-CK-6
Brand: Festo

Quick coupling socket KD4-CK-6

The Festo 531639 is an industrial component featuring a nominal width of 4.9 mm and an operating pressure range of -0.095 MPa to 1.2 MPa for compressed air operation according to ISO 8573-1:2010 [7:-:-]. Constructed with a nickel-plated brass housing, NBR seals, and a wrought aluminum alloy anodized union nut, this 63 g part accommodates an 8 mm pneumatic tubing outside diameter or a barbed fitting with a 6 mm inside diameter using a union nut. It delivers a normal nominal flow rate of 252 l/min to 756 l/min alongside an ISO 8778 standardized flow rate of 273.2 l/min to 819.5 l/min within an ambient temperature range of -10 °C to 60 °C. Submit the exact part number, quantity, and application requirements to receive a formal quotation.

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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: 531639
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Technical Specifications

Nominal width: 4.9 mm
Operating pressure for entire temperature range: -0.095 MPa...1.2 MPa | -0.95 bar...12 bar | -13.775 psi...174 psi
Normal nominal ow rate (normalized to DIN 1343): 252 l/min...756 l/min
Nominal ow rate standardized according to ISO 8778: 273.2 l/min...819.5 l/min
Operating medium: Compressed air as per ISO 8573-1:2010 [7:-:-]
Information on operating and pilot media: Lubricated operation possible
Corrosion resistance class (CRC): 1 - Low corrosion stress
LABS (PWIS) conformity: VDMA24364-B1/B2-L
Ambient temperature: -10 °C...60 °C
Product weight: 63 g
Pneumatic connection 1: for pneumatic tubing outside diameter 8 mm | For barbed tting, inside diameter 6 mm, with union nut
Material of union nut: Wrought aluminum alloy, anodized
Note on materials: RoHS compliant
Seals material: NBR
Material of spring: high-alloy stainless steel
Housing material: Brass, nickel-plated
Inner raceway material: Brass
Circlip material: high-alloy stainless steel
Material of pins: high-alloy stainless steel
Valve body material: Brass
Material releasing sleeve: PP

Engineering context

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Our sourcing response is prepared against Festo 531639. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.