Is the DN7.8 Quick-Connect Socket with Valve, Threaded Hardened Steel, Series 1625KA compatible only with 25KA hardened steel plugs for safe operation?

Yes. The DN7.8 Quick-Connect Socket with Valve, Threaded Hardened Steel, Series 1625KA must be paired exclusively with hardened steel plugs from the 25KA series for maximum safety. The product description explicitly states that, for maximum safety, the coupling should be paired only with 25KA hardened steel plugs to ensure proper mechanical fit, sealing performance and safe operation under the specified pressure and temperature conditions.

Can the DN7.8 Quick-Connect Socket with Valve, Threaded Hardened Steel, Series 1625KA be safely used with non-hardened or alternative-brand plugs under any circumstances?

No — the DN7.8 Quick-Connect Socket with Valve, Threaded Hardened Steel, Series 1625KA must not be paired with non-hardened or alternative-brand plugs except in very specific, manufacturer-approved cases. The socket is engineered and hardened (carbonitriding QPQ) to work safely and reliably only with hardened steel plugs from the 25KA series; this pairing ensures correct mechanical fit, wear compatibility, sealing integrity (NBR), and safe load distribution of internal parts (stainless springs, balls, rings). Using non-hardened or incompatible-brand plugs can cause accelerated wear, poor sealing, unexpected release or leakages, mechanical failure under pressure (up to 35 bar), and potential safety hazards, especially in demanding compressed-air or water applications and within the specified temperature range. If you consider an alternative plug, consult the manufacturer’s technical approval/documentation first — otherwise use only the specified 25KA hardened steel plugs.

DN7.8 Quick-Connect Socket with Valve, Threaded Hardened Steel, Series 1625KA

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

Additional information

Material	CS – steel (cast iron)

The premium quick coupling socket with valve DN7.8 from the 1625KA series is engineered for maximum reliability and efficiency in demanding applications. Equipped with either an external BSPT thread or an internal BSP thread, it ensures versatile installation options. Its robust body, manufactured from hardened steel using the advanced carbonitriding QPQ salt bath process, delivers exceptional resistance to wear and corrosion, while the black finish underlines its professional quality. The impact-resistant plastic locking sleeve made of PA6 + TPE guarantees durability and safe handling, while the one-hand operation design enhances user comfort and speed. Optimized for compressed air systems, the coupling achieves an impressive performance of 2020 l/min at 6 bar, and also offers reliable flow rates for water applications. With a working pressure of up to 35 bar and a secure sealing system based on NBR, it ensures leak-free operation even under challenging conditions. Internal components such as stainless steel springs, balls, and rings, combined with nickel-plated brass connection parts, provide long-lasting precision and stability. For maximum safety, the coupling should be paired exclusively with hardened steel plugs from the 25KA series. Designed to operate within a temperature range of -20°C to +40°C, this high-performance coupling socket is the perfect solution for professionals seeking durability, efficiency, and uncompromising quality in compressed air connections.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
RE-1625KAAK13SPN	Quick coupling socket 1625 DN7.8, GZ 1/4" BSPT, NBR	-	35	In stock	Enquiry
RE-1625KAAK17SPN	Quick coupling socket 1625 DN7.8, GZ 3/8" BSPT, NBR	-	35	In stock	Enquiry
RE-1625KAAK21SPN	Quick coupling socket 1625 DN7.8, GZ 1/2" BSPT, NBR	-	35	In stock	Enquiry
RE-1625KAIW13SPN	Quick coupling socket 1625 DN7.8, GW 1/4" BSP, NBR	-	35	In stock	Enquiry
RE-1625KAIW17SPN	Quick coupling socket 1625 DN7.8, GW 3/8" BSP, NBR	-	35	In stock	Enquiry
RE-1625KAIW21SPN	Quick coupling socket 1625 DN7.8, G 1/2" BSP, NBR	-	35	In stock	Enquiry

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The premium quick coupling socket with valve DN7.8 from the 1625KA series is engineered for maximum reliability and efficiency in demanding applications. Equipped with either an external BSPT thread or an internal BSP thread, it ensures versatile installation options. Its robust body, manufactured from hardened steel using the advanced carbonitriding QPQ salt bath process, delivers exceptional resistance to wear and corrosion, while the black finish underlines its professional quality. The impact-resistant plastic locking sleeve made of PA6 + TPE guarantees durability and safe handling, while the one-hand operation design enhances user comfort and speed. Optimized for compressed air systems, the coupling achieves an impressive performance of 2020 l/min at 6 bar, and also offers reliable flow rates for water applications. With a working pressure of up to 35 bar and a secure sealing system based on NBR, it ensures leak-free operation even under challenging conditions. Internal components such as stainless steel springs, balls, and rings, combined with nickel-plated brass connection parts, provide long-lasting precision and stability. For maximum safety, the coupling should be paired exclusively with hardened steel plugs from the 25KA series. Designed to operate within a temperature range of -20°C to +40°C, this high-performance coupling socket is the perfect solution for professionals seeking durability, efficiency, and uncompromising quality in compressed air connections.