Is the Brass DN5 Quick-Connect Socket with Valve and Hose End, Series 21KA compatible with thermoplastic hoses using the nut end?

Yes. The Brass DN5 Quick-Connect Socket with Valve and Hose End, Series 21KA is available in a version with a nut end specifically for thermoplastic hoses, so it is compatible when you choose the nut-end variant. Ensure you select the nut-end model and verify hose outer diameter and thread specifications match the coupling nut for proper fit and sealing.

Can the Brass DN5 Quick-Connect Socket with Valve and Hose End, Series 21KA be used for both pneumatic and hydraulic fluids without additional seals or modifications?

Brass DN5 Quick-Connect Socket with Valve and Hose End, Series 21KA uses NBR (nitrile) seals, stainless steel springs/balls and brass body, is rated to 35 bar and specified flow for both air and water. Based on the description, it is suitable for pneumatic systems (air) and for hydraulic fluids such as water without additional seals or modifications within its stated pressure (≤35 bar), temperature (−20°C to +100°C) and fluid compatibility for NBR. However, NBR has limited chemical compatibility with many hydraulic oils, aggressive fluids, and some solvents; for heavy mineral oils, synthetic hydraulic fluids or aggressive chemicals, a different seal material (e.g. FKM/Viton, EPDM) may be required. If your hydraulic fluid is standard water or a mineral-oil-based fluid known to be compatible with NBR and operating conditions stay within the stated limits, the coupling can be used as-is. For other hydraulic fluids, high pressures near the limit, or critical safety/industry standards, confirm fluid compatibility with the manufacturer or choose a coupling specified for that fluid/seal material.

Brass DN5 Quick-Connect Socket with Valve and Hose End, Series 21KA

All products, General-purpose low-pressure quick couplings/

Additional information

Material	B – brass (bronze)

The quick coupling socket with valve, Eurostandard DN5 (MINI), series 21KA, is a compact and highly efficient solution designed for demanding industrial applications where minimal dimensions must be combined with maximum performance. Available in two practical versions—one with a corrugated hose end and the other with a nut end for thermoplastic hoses—it ensures flexibility of use across a wide range of systems. Engineered for convenience, the socket allows simple one-handed operation, significantly improving workflow efficiency. Despite its small size, it delivers impressive flow rates of 560 l/min for air at 6 bar with minimal pressure drop, and 8 l/min for water at Δp=1 bar, ensuring reliable performance in both pneumatic and hydraulic environments. With a working pressure of up to 35 bar, it guarantees durability and safety even under intensive use. Manufactured from high-quality brass with stainless steel springs and balls, it offers excellent resistance to wear and corrosion, while NBR sealing ensures reliable tightness and long service life. Designed to operate in a wide temperature range from -20°C to +100°C, this coupling socket is a versatile and robust choice for industries seeking efficiency, reliability, and ease of use in compact form.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
RE-21KAKO06MPX	Quick coupling socket 21KA DN5, for hose 4x6 mm, brass, NBR	4	35	In stock	Enquiry
RE-21KAKO08MPX	Quick coupling socket 21KA DN5, for hose 6x8 mm, brass, NBR	6	35	In stock	Enquiry
RE-21KATF04MPX	Quick coupling socket 21KA DN5, for 4 mm hose, brass, NBR	4	35	In stock	Enquiry
RE-21KATF06MPX	Quick coupling socket 21KA DN5, for 6 mm hose, brass, NBR	6	35	In stock	Enquiry
RE-21KATF08MPX	Quick coupling socket 21KA DN5, for 8 mm hose, brass, NBR	8	35	In stock	Enquiry
RE-21KATF09MPX	Quick coupling socket 21KA DN5, for 9 mm hose, brass, NBR	8	35	In stock	Enquiry
RE-21KATF10MPX	Quick coupling socket 21KA DN5, for hose 10 mm, brass, NBR	10	35	In stock	Enquiry

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The quick coupling socket with valve, Eurostandard DN5 (MINI), series 21KA, is a compact and highly efficient solution designed for demanding industrial applications where minimal dimensions must be combined with maximum performance. Available in two practical versions—one with a corrugated hose end and the other with a nut end for thermoplastic hoses—it ensures flexibility of use across a wide range of systems. Engineered for convenience, the socket allows simple one-handed operation, significantly improving workflow efficiency. Despite its small size, it delivers impressive flow rates of 560 l/min for air at 6 bar with minimal pressure drop, and 8 l/min for water at Δp=1 bar, ensuring reliable performance in both pneumatic and hydraulic environments. With a working pressure of up to 35 bar, it guarantees durability and safety even under intensive use. Manufactured from high-quality brass with stainless steel springs and balls, it offers excellent resistance to wear and corrosion, while NBR sealing ensures reliable tightness and long service life. Designed to operate in a wide temperature range from -20°C to +100°C, this coupling socket is a versatile and robust choice for industries seeking efficiency, reliability, and ease of use in compact form.