AirTAC GR300-08 Pressure Regulator (GR30008F3)
The AirTAC AirTAC GR300-08 Pressure Regulator (GR30008F3) 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.
- TypePressure regulator
- Port sizePT1/4"
- Regulating range0.05 - 0.9 MPa (7 - 130 psi)
- Pressure typeStandard type
- Pressure gaugeFitted
- Reflux valveNot fitted
- ThreadPT
- BracketFixing bracket included
About the AirTAC GR300-08 Pressure Regulator (GR30008F3)
The GR30008F3 is a genuine AirTAC G-series air pressure regulator: regulation only, with no filter bowl and no lubrication function. This 300-size unit has a 1/4 in PT port and an embedded square pressure gauge scaled in bar, matching metric plant documentation. Set range is 0.05-0.9 MPa (7-130 psi), max inlet pressure is 1.0 MPa (145 psi), and the service temperature range is -20 to 70 C.
This is a genuine AirTAC part in the G series, which runs from 200 to 600 sizes with ports from 1/8 in to 1 in. Gauge scale, no-gauge version, reverse-valve fitment and thread (PT standard, G and NPT as options) are all selected by code. We confirm flow and datasheet figures on request, because flow for this series is published as curves rather than a single rated number.
AirTAC GR300-08 Pressure Regulator (GR30008F3) Technical Specifications
| Model | AirTAC GR300-08 Pressure Regulator (GR30008F3) |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (PT thread) |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard type |
| Bracket | Fixing bracket included |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — square, bar 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.
Model Code: AirTAC GR300-08 Pressure Regulator (GR30008F3)
| 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. |
| (blank) | Fixing bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | PT 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.
Size Class
- GR200PT1/8" - PT1/4"
- GR300PT1/4" - PT1/2"
- GR400PT3/8" - PT1/2"
- GR600PT3/4" - PT1"
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 |
Where the AirTAC GR300-08 Pressure Regulator (GR30008F3) Is Used
Lab air supply for test rigs
Provide a clean, stable regulated feed to bench-top test rigs and pneumatic fixtures in an R&D or quality lab, with the bar gauge matching the metric instrumentation used on the rest of the rig.
Woodworking clamp and jig actuation
Regulate the air to hold-down clamps and swing stops on a CNC or panel-saw outfeed table so workpieces are gripped firmly but without marking, with pressure set once and locked into the routine.
Wire and cable machinery air brakes
Supply the pneumatic tensioning brakes and guide cylinders on a wire-drawing or cable-twisting line, where each machine position needs its own steady, independently adjustable pressure.
Is the AirTAC GR300-08 Pressure Regulator (GR30008F3) the Right Regulator?
Size the regulator to the air demand: the G series steps through 200/300/400/600 with growing ports, and this 300 unit has a 1/4 in PT port. The set range for a standalone GR is 0.05-0.9 MPa (7-130 psi), read here on a square gauge in bar; MPa and psi scale variants and a no-gauge (N) code exist in the same size. Add K to the code if you need a reverse/check valve. Thread: PT is the standard; G (BSPP) and NPT are catalogue options to order. A mounting bracket is included. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
Quick checklist
- ✓ Body size for your peak flow (PT1/4" here)
- ✓ Standard 0.9 MPa or low-pressure 0.4 MPa
- ✓ Gauge fitted, or order N without
- ✓ Gauge shape C round / F square
- ✓ Scale MPa (1), psi (2) or bar (3)
- ✓ Reflux valve needed, order K
Installation & Maintenance Notes
- check Install downstream of the filter, following the airflow arrow.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Set pressure while air is flowing, then lock the knob.
- check Adjust within 0.05 - 0.9 MPa (7 - 130 psi) only.
- check Operating range -20 to +70 °C.
- check Panel-mount or use the fixing bracket; do not hang it on tubing.
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.
AirTAC GR300-08 Pressure Regulator (GR30008F3) FAQ
AirTAC does not publish a single rated flow number for this regulator; flow is given as characteristic curves that vary with inlet pressure, set pressure and allowable pressure drop. Share your operating conditions with us and we will confirm the sizing from the datasheet curves on request.
On GR units, F is the embedded square gauge and the digit is the scale: 1 = MPa, 2 = psi and 3 = bar, so the GR30008F3 reads in bar. If you do not want a gauge at all, the N code removes it, and K adds a reverse/check valve. The 300 gives a 1/4 in PT port; 200/400/600 sizes and G or NPT threads are also catalogue options.
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