The AirTAC GR400-10LJF1TK AirTAC Air Pressure Regulator NPT3/8 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 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 GR400-10LJF1TK is a pure air pressure regulator: it controls downstream pressure only - there is no filter, no bowl and no lubrication in this family. This unit is the low-pressure type, so its adjustment range goes up to 0.4 MPa, making it the right choice where the process needs a gentle, stable setting well below full line pressure. It is built in the 400 size with a 3/8 in NPT port, carries an embedded square gauge scaled in MPa, and includes a reverse (check) valve so downstream pressure is held if the supply side drops. Maximum working (inlet) pressure is 1.0 MPa (145 psi) and the operating temperature range is -20 to 70 C, wider than the rest of the G-series. No mounting bracket is fitted; the GR body is also panel-mountable.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, with standard or low-pressure regulation, gauge choices and an optional reverse valve. Flow figures for the GR series are published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GR400-10LJF1TK AirTAC Air Pressure Regulator NPT3/8 |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (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 | 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.
| GR400 | G-series pressure regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 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. |
| 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 | GR400 · PT3/8" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
On a carton-sealing or case-packing machine, pneumatic clamps and pushers often need a soft, repeatable setting well below full line pressure. This low-pressure GR400 regulator holds the circuit at a setpoint up to 0.4 MPa, and the check valve keeps the setting stable if supply pressure dips.
Paint and coating lines feed atomising air to guns and nozzles at controlled low pressures. A 3/8 in regulator with an MPa square gauge lets an operator read and hold the setpoint directly at the point of use, keeping finish quality consistent across shifts.
Looms, winders and converting equipment use light-duty air cylinders for guides, dancers and tension arms where a low, stable pressure is essential. The GR400 low-pressure regulator in 3/8 in NPT gives that fine control, and the wide -20 to 70 C range suits halls and plant rooms with cool supply air.
Start with the port and size: 200/300/400/600 step up in port and flow capacity, and this unit is 400 size with a 3/8 in NPT port - match the step to the flow your line needs. Then set the regulation range: the standard GR adjusts from 0.05 to 0.9 MPa, while this low-pressure (L) type tops out at 0.4 MPa, so choose L only when your setpoint sits in that lower band. Gauge options are the embedded square gauge (fitted here, MPa scale) or an external round gauge, with MPa, psi or bar scales. Thread is PT as standard; G (BSPP) and NPT are catalogue options to order - this unit is ordered in NPT. Brackets are optional (not fitted here), and the reverse valve (K) is fitted. Flow for the GR series is published as curves, not a single rating, so please ask us to confirm sizing against your application before ordering.
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 characteristic curves, not as a single rated number, so we do not quote a flow, Cv or SCFM figure for this unit. Tell us your line pressure, setpoint and expected air demand and we will confirm the sizing from the datasheet curves on request before you order.
The L in the code means this GR400 is the low-pressure regulator variant, with an adjustment range up to 0.4 MPa instead of the standard GR range. Choose it when your process setpoint sits in that lower band - for example coating, clamping or light actuation - and use the standard type when you need settings up to 0.9 MPa.
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.