The AirTAC AirTAC GR300-10 Air Regulator, NPT 3/8, Round Gauge (bar) is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.9 MPa (7 - 130 psi) with PT3/8" ports, and ships with a pressure gauge. A regulator does not filter the air — put a GF filter upstream, or use a GFR filter regulator, when water and particulate must also be removed.
The AirTAC GR300 series is a compressed-air pressure regulator: it does one job, holding a stable downstream pressure from an upstream supply that varies. This GR300-10 is the 300 size with a 3/8 in NPT port, standard regulation range of 0.05-0.9 MPa (7-130 psi), a round external pressure gauge scaled in bar, and a built-in reverse (check) valve so downstream pressure is held if the supply line is dropped. It is ordered without a mounting bracket; the GR series is also panel-mountable. As a regulator it contains no filter and no bowl, and it lubricates nothing - pair it upstream with a filter if the circuit needs one.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, with thread options (PT standard, G and NPT to order), gauge choices and scale options, low-pressure variants, and bracket or no-bracket builds. Rated flow is published as curves rather than a single figure, so ask us and we will confirm the datasheet figures for your application before you order.
| Model | AirTAC GR300-10 Air Regulator, NPT 3/8, Round Gauge (bar) |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT3/8" (NPT thread) |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard type |
| Bracket | Supplied without bracket |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — round, bar scale |
| Reflux valve | Fitted (reverse flow permitted) |
| Mounting | Panel mounting; optional fixing bracket |
Specifications follow the official AirTAC G-series air-preparation data. Note the GR temperature range is -20 to +70 °C, wider than the other G-series units. A regulator has no bowl and no filter element, so there is no filtering grade. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GR300 | G-series pressure regulator, 300 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Standard type — 0.05 - 0.9 MPa (7 - 130 psi). Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
Field order is size, port, type, bracket, gauge, gauge shape, scale, thread, reflux — a blank position takes the default. Example: GR300-08LNK is a 300 body, PT1/4", low-pressure type, no gauge, with reflux valve.
A larger body carries a larger port and holds set pressure better as flow rises. AirTAC publishes flow only as curves, so size the body from your peak demand with headroom rather than from a single rated figure.
| This model | GR300 · PT3/8" · 0.05 - 0.9 MPa (7 - 130 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Set and hold the working pressure feeding a small pneumatic press or clamping fixture, so forming and staking operations repeat at the same setpoint shift after shift.
Regulate the supply to the cylinders and flap-folders on a packaging or carton-sealing line, where a steady downstream pressure keeps cycle motion consistent as the main line pressure drifts.
Trim a gentle, stable pressure to a pick-and-place robot's gripper cylinders, with the check valve holding the set pressure at the gripper if the supply line is disconnected.
Start with the port step: GR comes in sizes 200 through 600, and the 300 size with a 3/8 in port suits circuits whose air demand sits in that port class - size up if your line may grow. Set the working pressure inside the 0.05-0.9 MPa (7-130 psi) range; if your process runs below roughly 0.4 MPa, ask about the GR low-pressure (L) type instead. This unit ships with a round external gauge scaled in bar; square embedded gauges and MPa or psi scales are the other catalogue choices. Thread here is NPT - PT is the standard thread and G (BSPP) is the other order option, so match the thread to your piping, not to availability. The K code adds a reverse/check valve, useful where a held downstream pressure matters during supply loss, and the J code means no mounting bracket is supplied. Because flow is published as curves rather than a single rating, send us your demand and we will confirm sizing against the datasheet before you order.
Quick checklist
The reflux valve lets air flow back through the regulator, which is useful when downstream volume must vent quickly. A regulator does not remove water or particulate; that is the filter's job.
AirTAC publishes GR-series flow as performance curves rather than a single rated figure, so we do not quote a Cv or flow number on the page. Tell us your port size and air demand and we will confirm the datasheet flow curve for the GR300 against your application before you order.
The C in the code GR30010JC3TK specifies the optional external round pressure gauge, and the 3 selects the bar scale. The catalogue also offers an embedded square gauge and MPa or psi scales, so you can match the gauge to the units your technicians read. Note the thread on this unit is NPT (T code); PT is the standard thread and G (BSPP) is the other order option.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity, thread type (PT / G / NPT), gauge scale and destination. We confirm price, availability and lead time — usually within 7-8 hours.