Female-thread coupling with NBR rubber seal, DIN 3489, malleable cast iron, galvanized, max. PN 10, sizes G 1/4"–G 2"
Robust Krause K+K female-thread coupling conforming to DIN 3489, made of zinc-plated malleable cast iron with a 42 mm claw spacing and an NBR seal. For general compressed air systems up to PN 10, available in thread sizes from G 1/4" to G 2".
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| Item No.
003-03
Female-thread coupling with NBR rubber seal, DIN 3489, malleable cast iron, galvanized, max. PN 10, sizes G 1/4"–G 2" - G 1/4" is in stock and will be shipped as soon as it is available again
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Leasing & Rent-to-Own
Leasing & Rent-to-Own
We offer leasing and rent-to-own financing options exclusively to business owners, tradespeople, and the self-employed for selected products with a net merchandise value of €1,000 or more. Below you will find the key differences between these two financing options.
Leasing
In a lease, the product is made available to the lessee for use in exchange for regular lease payments. The lessor is responsible for accounting for the lease. The lease payments can generally be claimed as business expenses for tax purposes. These are gross payments, and value-added tax is charged throughout the entire term. At the end of the agreed-upon basic lease term, it is generally possible to purchase the product.
Hire Purchase
Hire purchase is economically equivalent to installment purchase. The product is capitalized on the hire purchaser’s balance sheet and depreciated in accordance with the official depreciation tables. Upon payment of the final hire purchase installment, ownership of the item is transferred to the hire purchaser. Value-added tax must be paid in full with the first hire purchase installment (transitory item).
Shipping & Delivery
Shipping & Delivery
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Most of the products offered are shipped directly from the manufacturer or from external central warehouses (direct shipping). As a result, delivery times may differ from the estimated times provided. Delivery delays may occur, particularly in the event of material shortages, production delays, supply bottlenecks, force majeure, or other circumstances beyond our control.
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We assume no liability for delivery delays resulting from circumstances beyond our control. This applies in particular to delays caused by manufacturers, suppliers, shipping companies, or other third parties. Liability for any resulting damages—in particular for indirect damages, consequential damages, or lost profits—is excluded to the extent permitted by law.
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In the event of significant delivery delays, we will inform the customer immediately. The customer’s mandatory statutory rights remain unaffected by this.
| Item No.
003-03
Female-thread coupling with NBR rubber seal, DIN 3489, malleable cast iron, galvanized, max. PN 10, sizes G 1/4"–G 2" - G 1/4" is in stock and will be shipped as soon as it is available again
Krause K+K female-thread coupling DIN 3489 – Robust compressed air claw coupling with NBR seal
The female-thread coupling from Krause K+K is part of the symmetrical quick coupling system in accordance with DIN 3489 and is designed for general compressed-air systems in industry, workshops, trade, and on construction sites. The standardized coupling head with two claws locks into place with a rotational movement of approximately 45° and allows for quick connection and disconnection of compressed-air lines.
The coupling is made of galvanized malleable cast iron, has a claw spacing of 42 mm with double safety cams, and is equipped with an NBR rubber seal. The temperature range extends from −40 °C to +100 °C, and the maximum operating pressure is PN 10. Thanks to the wide range of female thread sizes, from G 1/4" to G 2", the coupling can be flexibly connected to fittings, manifolds, lines, and other compressed air components.
Benefits
✅ Standardized claw coupling system according to DIN 3489
✅ 42 mm claw spacing with double safety cams
✅ Sturdy, zinc-plated malleable cast iron for professional use
✅ NBR rubber seal for general compressed air applications
✅ Quick locking by rotating approximately 45°
✅ Uniform coupling head within the standard DIN 3489 system
✅ Large through-hole for maximum air flow
✅ Wide range of sizes from G 1/4" to G 2"
✅ Maximum operating pressure PN 10
Technical Specifications
| Feature | Value |
|---|---|
| Translation | Female-thread coupling / claw coupling |
| Standard | DIN 3489 |
| claw spacing | 42 mm |
| Claw Design | double safety cam |
| Material | Malleable cast iron, galvanized |
| Gasket | NBR |
| Temperature range | −40 °C to +100 °C |
| operating pressure | max. PN 10 |
| Blasting medium | Compressed air |
Variants
| female thread | Item No. / SKU |
|---|---|
| G 1/4" | 003-03 |
| G 3/8" | 003-05 |
| G 1/2" | 003-07 |
| G 3/4" | 003-09 |
| G 1" | 003-11 |
| G 1 1/4" | 003-13 |
| G 1 1/2" | 003-15 |
| G 2" | 003-17 |
How It Works and Compatibility
✔ Symmetrical quick coupling system with two claws
✔ Lock by turning the coupling approximately 45°
✔ Uniform coupling head across all standard DIN 3489 claw couplings
✔ Different connection variants of the system can be connected to one another
✔ Large through-hole for maximum air flow
✔ Female threaded connection for direct integration into fittings, manifolds, and compressed-air lines
Applications
✔ Compressed air supply for workshops and industry
✔ Compressors and compressed-air lines
✔ Mobile compressed air systems on construction sites
✔ Mechanical and Plant Engineering
✔ Connection of compressed air components with internal threaded fittings
✔ Blasting technology and other compressed-air-powered applications within the permissible operating parameters
FAQ
What is the claw spacing of the coupling?
The claw spacing is 42 mm.
Which seal is installed?
The coupling is equipped with an NBR rubber seal.
What is the maximum operating pressure?
The maximum operating pressure is PN 10.
What sizes are available?
We carry female-thread couplings in G 1/4", G 3/8", G 1/2", G 3/4", G 1", G 1 1/4", G 1 1/2", and G 2".
Can the coupling be connected to other connection types in the DIN 3489 series?
Yes. The key feature for the coupling side is the standardized 42-mm coupling head; this allows the various connection types of the standard system to be connected to one another.
Is the coupling suitable for compressed air?
Yes. Krause K+K specifies this coupling series for general compressed air systems.
Conclusion
The Krause K+K female-thread coupling, compliant with DIN 3489, is a robust and versatile solution for professional compressed air systems. With a 42 mm claw spacing, zinc-plated malleable cast iron, an NBR seal, a temperature range of −40 °C to +100 °C, and a maximum operating pressure of PN 10, it is suitable for numerous applications in workshops, industry, construction sites, and blasting technology. The wide range of thread sizes facilitates seamless integration into a wide variety of compressed air systems.
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