Hose end fitting NW6 - ST30 thread

The NW6 hose end fitting - ST30 thread is a connection component intended for making or repairing hose connections in pressure-washer systems. The NW6 standard refers to the nominal diameter/flow size in the hose system, and the ST30 thread specifies the connection type on the port side. In service practice, this part is used when a hose end is damaged or when the correct accessory connection standard must be restored.

MPN / reference: 12030
Hose standard: NW6
Thread: ST30

APPLICATION

The fitting is used in typical service work for hose systems:

• repair of a damaged hose end in a pressure washer,
• making a new hose end in the NW6 standard,
• matching the hose connection to accessories with an ST30 thread,
• eliminating leaks caused by a worn or damaged end fitting,
• servicing hose installations used in workshop and industrial conditions.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the fitting when you notice:

• leakage at the hose connection near the fitting,
• ST30 thread damage (wear, galling, stripped thread),
• cracking, deformation, or corrosion of the part,
• difficulty tightening and achieving a leak-tight joint,
• mechanical damage after overload, dropping, or harsh operating conditions.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• confirm the hose standard: NW6,
• confirm the connection type: ST30 thread,
• verify the manufacturer number: MPN 12030,
• compare with the removed part: length, geometry, how it seats on the hose, and the sealing method.

In hose connections, correct standard and thread match are critical - a mismatch leads to leaks or inability to assemble.

COMPATIBILITY

Select the fitting based on the NW6 standard and the ST30 thread, as well as compatibility with the specific hose and accessory it will connect to. The safest confirmation is by MPN 12030 and comparison with the removed part.

[faq]

What does the NW6 marking mean in practice on a hose end fitting?|It refers to the hose standard/nominal flow size in the system. This matters for matching the fitting to the correct hose and for maintaining proper flow and fitment.

How can I be sure I need ST30 and not a similar thread?|The most reliable method is comparing with the removed part and selecting by MPN 12030. Thread descriptions can be confusing, and small differences can prevent proper installation.

Why can the connection leak even with a new fitting?|Most often due to a damaged mating port on the accessory side, a worn sealing surface, incorrect installation, or an issue with the hose itself (e.g., damage at the crimp).

Is this fitting something to “refurbish” or rather to replace?|It’s typically treated as a replaceable part. If the thread or sealing surfaces are worn, repair is unreliable - replacement is the standard service solution.

What should I check before installation to avoid damaging the new thread?|Thread cleanliness, straight alignment when starting the thread, and the condition of the mating port on the accessory side. If you feel resistance early, stop and verify fitment instead of forcing it.

[/faq]