Trigger-gun nut ST30 M22×1.5

The ST30 M22×1.5 gun nut is a connection part used on high-pressure trigger-gun fittings, where it provides the mechanical clamping of an ST30 / M22×1.5 connection. In service practice, the nut is replaced when the thread is damaged, the nut is deformed after overload, or when the joint won’t align properly and leaks occur.

MPN / reference: 132761
Connection standard: ST30
Thread: M22×1.5

APPLICATION

The nut is used in typical accessory service work:

• repairing a gun-to-hose/adapter connection in the ST30 standard,
• replacing a damaged nut after stripped or worn M22×1.5 thread,
• restoring straight (axial) alignment of the joint,
• refurbishing the gun connection end without replacing the entire accessory component.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the nut when you notice:

• leakage at the joint despite correct tightening,
• the M22×1.5 thread binds or “skips” (wear/stripping),
• cracking or deformation of the nut,
• poor alignment and difficulty tightening “straight,”
• recurring leaks after disassembly when the nut shows wear.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• confirm the connection standard: ST30,
• verify the thread: M22×1.5,
• confirm the manufacturer number: MPN 132761,
• compare with the removed part: length, shape, nut type, and how it works with the sealing element in the joint.

With M22 accessories, thread pitch (1.5) and system-specific fit matter-similar nuts can differ in details.

COMPATIBILITY

Select the nut based on MPN 132761 and compatibility with the ST30 / M22×1.5 trigger-gun connection. The safest confirmation is comparison with the removed part, because multiple M22 nut variants exist in accessories.

[faq]

Will replacing only the nut fix a leaking connection?|Not always. The nut provides clamping force, but sealing also depends on the condition of the seal/O-ring and the contact surfaces. If the seat or cone is damaged, a leak can remain even with a new nut.

What does ST30 mean for a trigger-gun nut?|It’s the designation of the connection/accessory standard. In practice it helps distinguish the correct nut/end variant from other M22 systems that can look similar but won’t match dimensionally.

Why does an M22×1.5 thread wear out quickly on accessories sometimes?|Most often due to cross-threading, dirt on the thread, overload from hose twisting, and excessive tightening torque. Starting the thread straight is key in service.

How can I avoid damaging the new nut during installation?|Clean the threads, start it straight, and don’t force it at the beginning. If resistance appears immediately, stop and verify fitment. Overtightening usually doesn’t fix leaks-it just destroys the thread.

What should I check after replacing the nut?|Leak tightness under pressure, the condition of the seal in the joint, and whether the hose is pulling at a sharp angle near the gun (which loads the nut and accelerates wear).

[/faq]