The AirTAC GR30008LJF1T 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 - 0.4 MPa (7 - 58 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 GR30008LJF1T is an AirTAC GR-series air pressure regulator: it does one job, holding a steady downstream air pressure from a compressed-air supply, and it does nothing else - no filtration, no bowl, no lubrication. This unit is the 300 size with a 1/4 in NPT port, built as the low-pressure type, so its setting range tops out at 0.4 MPa while the maximum inlet pressure remains 1.0 MPa (145 psi). It ships as configured with an embedded square gauge scaled in MPa, and without a mounting bracket; the GR body is also panel-mountable. As a regulator-only unit it suits lines where the air is already clean and dry and only pressure control is needed. Operating temperature is -20 to 70 C, wider than the rest of the G family.
This is a genuine AirTAC part. The GR family spans four sizes (200, 300, 400, 600) with ports from 1/8 in to 1 in, and the catalogue offers choices in thread (PT standard, G and NPT to order), gauge type and scale, low-pressure or standard regulation, a reverse/check valve option, and bracket or no bracket. We do not quote a single rated flow figure because AirTAC publishes flow as curves; ask us and we will confirm the datasheet figures for your application.
| Model | GR30008LJF1T AirTAC Air Pressure Regulator, NPT1/4 |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (NPT thread) |
| Regulating range | 0.05 - 0.4 MPa (7 - 58 psi) |
| Pressure type | Low-pressure 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". |
| L | Low-pressure type — 0.05 - 0.4 MPa (7 - 58 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 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
On a carton-sealing or bagging machine, clamp and hold-down cylinders often need a gentler, tightly capped pressure than the main header supplies. This low-pressure GR regulator on the 1/4 in drop keeps those actuators in their safe setting range, with the MPa gauge giving the operator a direct readout at the setpoint.
At a PCB or small-component assembly station, air is used for part blow-off, pick-and-place assist and low-force clamping. A 1/4 in NPT regulator-only unit fits neatly at the bench drop where the supply is already filtered, holding a fixed, low setting so delicate parts and light actuators are not over-pressured.
In a factory where the main FRL at the compressor room sets the header pressure, individual cells still need their own lower, stable pressure. Mounting this GR300 regulator at each cell's 1/4 in take-off lets each line run at its own setpoint independently, without adding a second filter or lubricator where the air is already treated.
Start with the port and size step: GR comes in 200, 300, 400 and 600, with ports from 1/8 in up to 1 in, and the larger the size the more flow the body passes - match the step to your line's air demand rather than oversizing on guesswork. Then set the regulation type: this low-pressure (L) version regulates up to 0.4 MPa, which is right for actuators and processes that must never see full line pressure; the standard type covers the full range. Choose the gauge scale (MPa, psi or bar) and square embedded versus round external. Thread is PT as standard, with G and NPT as orderable options - this unit is NPT. Decide on a bracket (this one has none) and whether you want the reverse/check valve option. One honest note: AirTAC publishes flow as curves, not a single rated number, so send us your application's air demand and we will confirm the sizing against the datasheet 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.
AirTAC publishes regulator flow as curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number for this unit. Tell us your application's air demand and operating pressure and we will confirm the sizing against the datasheet curves on request before you order.
The L in the model code marks the low-pressure type of the GR family: its setting range tops out at 0.4 MPa, while the maximum inlet pressure is still 1.0 MPa (145 psi). It is chosen for circuits that must never be set above that level. If you need the full setting range, the standard GR type (without the L) is the version to specify - and the gauge scale, thread (PT standard, G or NPT) and bracket are all decodable choices on the order code too.
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.