Male-thread coupling with locking nut and NBR rubber seal, DIN 3238, steel/cast iron, galvanized, max. PN 16, sizes G 3/8" – G 1"
Krause K+K male-thread coupling according to DIN 3238 with brass locking nut and oil-resistant NBR seal. 42 mm claw spacing, galvanized steel/cast iron, max. PN 16, and compatible with MODY safety threaded couplings.
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| Item No.
011-05
Male-thread coupling with locking nut and NBR rubber seal, DIN 3238, steel/cast iron, galvanized, max. PN 16, sizes G 3/8" – G 1" - G 3/8" is in stock and will be shipped as soon as it is available again
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Leasing & Rent-to-Own
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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
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Shipping & Delivery
Shipping & Delivery
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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.
011-05
Male-thread coupling with locking nut and NBR rubber seal, DIN 3238, steel/cast iron, galvanized, max. PN 16, sizes G 3/8" – G 1" - G 3/8" is in stock and will be shipped as soon as it is available again
Krause K+K male-thread coupling with locking nut DIN 3238 – Lockable safety coupling for compressed air
The male-thread coupling from Krause K+K, conforming to DIN 3238, is a threaded claw coupling with a locking nut designed for compressed air systems requiring enhanced safety. After the two claws are coupled in the conventional manner, the connection is manually secured using the locking nut. This prevents the coupling from coming loose on its own.
The coupling has a 42 mm claw spacing with double safety cams. The coupling body is made of galvanized steel/cast iron, and the locking nut is made of brass. An oil-resistant NBR seal provides the seal. The temperature range is −40 °C to +100 °C, and the maximum operating pressure is PN 16. According to Krause K+K, the series is compatible with all MODY safety threaded couplings.
Benefits
✅ Safety coupling according to DIN 3238
✅ Locking nut for manually securing the connection
✅ Protection against accidental loosening
✅ 42 mm claw spacing with double safety cams
✅ Coupling body made of steel/cast iron, galvanized
✅ Brass locking nut
✅ Oil-resistant NBR seal
✅ Temperature range: −40 °C to +100 °C
✅ Compatible with MODY safety threaded couplings
✅ Maximum operating pressure PN 16
Technical Specifications
| Feature | Value |
|---|---|
| Translation | Male-thread coupling with locking nut |
| Standard | DIN 3238 |
| claw spacing | 42 mm |
| Claw Design | double safety cam |
| coupling body | Steel/cast iron, galvanized |
| locking nut | Brass |
| Gasket | NBR, oil-resistant |
| Temperature range | −40 °C to +100 °C |
| operating pressure | max. PN 16 |
| Compatibility | Compatible with MODY safety threaded couplings |
Variants
| male thread | Item No. / SKU |
|---|---|
| G 3/8" | 011-05 |
| G 1/2" | 011-07 |
| G 3/4" | 011-09 |
| G 1" | 011-11 |
How It Works and Compatibility
✔ The two claw couplings are first coupled together like a traditional claw coupling
✔ Next, tighten the locking nut by hand
✔ The locking nut prevents the connection from coming loose on its own
✔ Krause K+K recommends combining a classic claw coupling with a claw coupling with locking nut
✔ According to the manufacturer, the DIN 3238 series is compatible with all MODY safety threaded couplings
✔ The male thread allows for direct mounting on fittings, pipes, and compressed air components
Operation and Safety
Before coupling, sealing surfaces, jaws, and the locking nut must be clean and undamaged. After coupling, the locking nut is tightened by hand or according to the intended operating procedure. Before disconnecting a compressed-air connection, the line must be depressurized. Worn seals or damaged coupling parts must be replaced before further use.
Applications
✔ General Compressed Air Systems
✔ Construction Sites and Industry
✔ Compressors and compressed-air lines
✔ Mechanical and Plant Engineering
✔ Applications with increased need for a lockable coupling connection
✔ Professional compressed air and blasting technology within the permissible operating parameters
FAQ
What is the function of the locking nut?
It secures the coupling manually, thereby preventing it from coming loose on its own.
What is the claw spacing of the coupling?
42 mm.
Which seal is used?
An oil-resistant NBR seal.
What is the maximum operating pressure?
PN 16.
What thread sizes are available?
G 3/8", G 1/2", G 3/4", and G 1".
Is the coupling MODY-compatible?
Yes. Krause K+K specifies that the series is compatible with all MODY safety threaded couplings.
Conclusion
The Krause K+K male-thread coupling, conforming to DIN 3238, is a robust safety coupling for professional compressed air systems. The 42-mm coupling head, the manually lockable brass locking nut, the oil-resistant NBR seal, and PN 16 ensure a reliable connection for applications where the coupling must be prevented from coming loose on its own.
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