The AirTAC GR30008JNT AirTAC Air Pressure Regulator NPT1/4 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, ordered without a 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 GR30008JNT is an AirTAC GR300 series air pressure regulator, a genuine AirTAC part that does one job only: holding a stable, adjustable downstream pressure from your compressed-air supply. This unit is the 300 size with a 1/4 in NPT port, the standard (not low-pressure) type, and it is supplied without a gauge (N) and without a mounting bracket (J). The outlet pressure is adjustable across 0.05-0.9 MPa (7-130 psi), with a maximum inlet pressure of 1.0 MPa (145 psi) and an operating temperature range of -20 to 70 C.
GR300 is one of four sizes in the GR family (200, 300, 400 and 600), each stepping up in port size and flow capacity. Options you can order include a fitted gauge, a mounting bracket, a reverse/check valve, the low-pressure type, and G (BSPP) or NPT threads in place of the PT standard. Because AirTAC publishes flow for this series as curves rather than a single rated figure, we confirm the datasheet and flow figures for your application on request.
| Model | GR30008JNT AirTAC Air Pressure Regulator NPT1/4 |
|---|---|
| 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 | Not fitted |
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 a stable supply pressure feeding directional control valves on an automated assembly line, so cylinder strokes stay consistent shift after shift.
Regulate the air feeding a small bench-mounted pneumatic press or clamping fixture, letting the operator dial in the working pressure for each job.
Drop the plant air header pressure to the level a machine tool's pneumatic components require at the point of use, isolated from header fluctuation.
Start with the port and size step: GR300 with a 1/4 in port suits lines plumbed at 1/4 in; if your demand sits near the top of the 300 size, step up to GR400 or GR600 rather than oversizing on paper. Because flow for this series is published as curves and not a single rated number, ask us to confirm sizing against your actual air demand before ordering. Then settle the decode choices: this code has no gauge fitted (N), so add a gauge code if you want local pressure indication, choosing the scale (MPa, psi or bar) and square or round style; J means no bracket, so order the bracket option if you panel- or wall-mount; T specifies NPT thread, with G (BSPP) or the PT standard available as order options. If your set pressure never exceeds 0.4 MPa, the GR low-pressure type (L) is the matching variant.
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.
AirTAC publishes flow for the GR300 series as curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application and air demand and we will confirm the datasheet and the correct size for you on request.
The N in GR30008JNT means no gauge is supplied. Order the gauge option with the model code instead: choose the square (embedded) or round (external) style and the scale - 1 for MPa, 2 for psi or 3 for bar. The thread on this unit is NPT (T); G (BSPP) and the PT standard are catalogue options you can order. A mounting bracket is likewise an order option, since J omits it.
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.