Custom G1/4″ Female Thread Pneumatic Quick Coupling Plug

Product Description:

We machine these Custom G1/4″ Female Thread Pneumatic Quick Coupling Plug from brass, stainless steel or steel bar stock on Qimao Metal Manufacturer own cold heading machine then CNC lathes. Nothing is outsourced. The plug nose is ground to a fine surface finish so it slides into standard sockets smoothly and locks positively with a satisfying click. The female thread at the back is rolled rather than cut, which is a detail many buyers overlook but makes a real difference in thread strength over repeated use. Cut threads tend to tear or strip when you overtighten, but rolled threads hold their shape better and resist galling. We also apply a thin dry film lubricant on the threads from the factory. It is not grease, it is a coating that helps you thread the fitting in by hand smoothly and prevents seizing even after months of service. The O-ring we use is a standard NBR type, replaceable, nothing fancy but it works reliably across a wide temperature range. Internally, we have opened up the bore slightly to reduce airflow restriction, because we know that every psi counts when you are running a heavy-duty impact wrench on a long hose.

Specification

Products Details:

The thread is G1/4″ female, BSP standard, Custom G1/4″ Female Thread Pneumatic Quick Coupling Plug is the most common size you will find on European air tools and hose ends. The body is DN7.2, which refers to the nominal bore size and matches standard quick coupling systems. Material is carbon steel, grade comparable to 1045 or similar. We heat treat it for core hardness, not just surface case hardening, so the fitting can handle impact loads without cracking. Surface finish is zinc plating with clear trivalent chromate. It is not the most expensive coating out there but we have tested it to 72 hours in salt spray without visible red rust, which is plenty for most workshop and factory conditions. Maximum working pressure is 35 bar, burst pressure is roughly four times that. Temperature range goes from -20°C up to 100°C. Sealing is done by a replaceable NBR O-ring, which you can swap out in seconds if it ever wears out. The coupling is rated for over 100,000 connection cycles under light lubrication. We also check interchangeability against ISO 6150 B standards so you know it fits existing sockets without issues.

Product Feature:

• The item Custom G1/4″ Female Thread Pneumatic Quick Coupling Plug nose with female rear thread in one body. Saves you one adapter and one potential leak point compared to traditional setups.

• Rolled threads on the female end. Stronger, smoother, less prone to cross-threading during installation.

• Knurled grip on the plug body. Small touch but makes hand connections easier, especially when your hands are oily.

• Positive locking mechanism with audible click. You know when it is fully engaged, no guessing.

Product Application:

• Automotive assembly plants, where air tools get swapped between operators constantly and connections need to be fast and reliable.

• Spray painting booths needs Custom G1/4″ Female Thread Pneumatic Quick Coupling Plug, because these fittings seal well and do not let atomizing air fluctuate.

• Heavy equipment repair shops, where conditions are dusty, hoses get dragged across concrete floors, and only sturdy fittings survive.

• Tire service centers, connecting inflation guns and impact wrenches that see heavy daily use.

• OEM machine builders who integrate custom pneumatic circuits and need consistent, repeatable fitting quality across large batches.