The Grex X40NS.12 1.2mm Nozzle Kit, for X4000 Spray Gun is a replacement nozzle kit for the Grex X4000 spray gun, Model Number X40NS.12. This is a spray gun nozzle kit designed for restoring or changing the fluid and atomizing setup on a Grex X4000 spray gun for coating application work. If you are spraying finishes and need the correct matched internal parts instead of replacing one worn piece at a time, this is the right kind of kit to look at.

What matters here is that Grex sells this as a matched set. According to the available product data, the kit includes the air cap, fluid needle, and fluid nozzle. That matters because these parts work together. When one part is damaged, worn, or changed to a different size, spray quality can suffer. Replacing the full matched set helps keep pattern consistency and fluid delivery where it should be.

The listed nozzle size is 1/16" (1.2 mm), which puts this kit in a useful range for finishing materials where control and atomization matter. Supplementary product data also lists a fluid output of 130 cc per minute and a pattern width of 12" (300 mm). In practical terms, that gives you a reference point for how this setup is intended to spray when installed on the correct Grex platform.

This is an air-powered spray gun accessory, not a standalone tool. It is meant for users who already own the Grex X4000 and need either a direct replacement or a specific nozzle size setup for their work. That makes it more of a maintenance and tuning part than a general paint sprayer purchase.

Based on the provided application data, this kit is suited for base coats, clear coats, and primer seals. That makes it relevant for finish-focused users who need predictable spray performance, whether they are maintaining an existing gun or setting it up for a specific coating.

If you run a Grex X4000 regularly, keeping a complete nozzle kit on hand is usually smarter than waiting until performance drops off mid-job. This product makes the most sense for painters and finishers who know exactly which gun they are running and want the correct Grex replacement parts instead of trying to piece a setup together.

Grex X40NS.12 1.2mm Nozzle Kit Keeps Your X4000 Working Like It Should

If your Grex gun is starting to spray inconsistently, a complete matched nozzle kit is usually the smarter move than replacing one piece and hoping for the best.

• Who it's for: X4000 owners spraying base coats, clear coats, or primer seals who need the correct 1/16" (1.2 mm) setup.
• Why it stands out: You get the air cap, fluid needle, and fluid nozzle together, which is how these parts should be replaced when performance matters.
• Worth knowing: This is not a standalone sprayer. It is a platform-specific replacement kit for the Grex X4000.

• What spray gun does this kit fit? The available product data states that it is for the Grex X4000 spray gun.
• Is this a full spray gun? No. This is a nozzle kit, not a complete spray gun.
• What parts are included in the kit? The product description lists an air cap, fluid needle, and fluid nozzle.
• What applications is it suggested for? Supplementary product data lists base coats, clear coats, and primer seals.