The AirTAC AirTAC GR300-08 Air Pressure Regulator NPT1/4 (Square Gauge) 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 PT1/4" 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 is an air pressure regulator: its only job is to hold a steady downstream pressure from a compressed-air supply. This configuration is the 300 size with 1/4 in NPT ports, standard type, adjusting from 0.05 to 0.9 MPa (7-130 psi). A square pressure gauge is fitted so the set pressure is visible at the panel, and no mounting bracket is included (J code); the GR can also be panel-mounted.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, PT as the standard thread and G or NPT as orderable options, with embedded square or external round gauges in MPa, psi or bar scales and a low-pressure type (L) rated up to 0.4 MPa. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures against your application.
| Model | AirTAC GR300-08 Air Pressure Regulator NPT1/4 (Square Gauge) |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (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 — square, MPa scale |
| Reflux valve | Not fitted |
| 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. |
|---|---|
| 08 | Port size PT1/4". 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 1 is MPa, 2 is psi, 3 is bar. |
| T | NPT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
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 · PT1/4" · 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 a stable supply pressure to the air cylinders and grippers on an assembly robot, so pick-and-place strokes repeat consistently shift after shift.
Regulate the air feeding sealing jaws and carton-closing actuators on a packaging line, keeping the set pressure steady as the machine cycles.
Feed pneumatic pushers, diverters and stop gates on a conveyor system from a regulated supply so actuator forces stay predictable along the line.
Step through the GR sizes (200/300/400/600) to match the port and the flow your line needs - the 300 size here takes 1/4 in ports. Choose the gauge you want (embedded square or external round) and its scale (MPa, psi or bar); this unit comes with a square gauge reading in MPa. PT is the standard thread with G (BSPP) and NPT as orderable options, and a bracket can be specified if you are not panel-mounting. Flow is published as curves, not a single rated figure, so let us confirm sizing against your application before you order.
Quick checklist
Without a reflux valve, air cannot flow back through the regulator — order the K option if reverse flow is required. A regulator does not remove water or particulate; that is the filter's job.
Flow for the GR300 is published as curves rather than a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the datasheet flow curve and correct sizing before you order.
Yes. This unit comes with an embedded square gauge reading in MPa; external round gauges and psi or bar scales are available options, as are G (BSPP) and NPT threads - PT is the standard. Tell us your preference when ordering and we will confirm the configuration.
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.