The AirTAC GR40010LJF3T AirTAC Pressure Regulator NPT3/8 Low-Pressure 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 GR40010LJF3T is a genuine AirTAC air pressure regulator from the GR400 series, built for one job only: holding a steady downstream air pressure. This configuration is the low-pressure type, so it adjusts outlet pressure up to 0.4 MPa, and it carries a 3/8 inch NPT port. A square pressure gauge with a bar scale is fitted as standard, and because the code ends in J it comes without a mounting bracket - the GR body can also be panel-mounted. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -20 to 70 C, wider than the rest of the G family.
This is a genuine AirTAC part. The GR regulator family spans four sizes (200, 300, 400, 600) with ports from 1/8 to 1 inch, standard or low-pressure regulation, gauge or no gauge, bracket or no bracket, and PT, G or NPT threads. Flow for this series is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet and sizing figures for your application on request.
| Model | GR40010LJF3T AirTAC Pressure Regulator NPT3/8 Low-Pressure |
|---|---|
| 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, 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.
| 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. |
| 3 | Gauge scale: bar. 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 | 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 machining centre where pneumatic clamps must close gently and hold at a low set pressure, this low-pressure GR regulator sits in the 3/8 inch clamp line and lets the setter dial in and hold the exact holding pressure on its bar-scale gauge.
In a paint or coating booth, low-pressure air feeds spray guns and air knives through 3/8 inch drops. This regulator keeps that feed steady at a low set point so operators get a repeatable finish from shift to shift, read directly off the fitted gauge.
Pneumatically actuated butterfly and diaphragm valves on a treatment skid often need a modest, precisely held air supply to the positioner and actuator. This low-pressure regulator in the 3/8 inch actuation line holds that supply stable, with the bar gauge giving operators an at-a-glance check.
Start with the port step: the 400 size in this code takes a 3/8 inch port, and larger sizes carry larger ports and more flow, so match the size to the air demand of the circuit rather than the pipe alone. Choose the low-pressure type (L) when the set pressure stays at or below 0.4 MPa, and the standard type when you need the full 0.05-0.9 MPa range. Pick the gauge scale you prefer - MPa, psi or bar - and the thread you want: PT is the standard, with G (BSPP) and NPT as orderable options. Decide whether you need the mounting bracket (J means no bracket; the GR is also panel-mountable).
One honest note before you order: AirTAC publishes GR flow as characteristic curves, not as a single rated number, so we do not quote a flow figure here. Send us your application details and we will confirm the sizing against the datasheet curves before you commit.
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 GR regulator flow as characteristic curves, not as a single rated figure, so we do not quote a l/min, m3/h or SCFM number here. Tell us your inlet pressure, set pressure and expected air demand, and we will confirm the sizing against the datasheet curves for this 3/8 inch, 400-size unit on request.
The L in the code marks the low-pressure type: it regulates outlet pressure up to 0.4 MPa, which suits circuits that only ever need a modest set pressure. The standard GR400 covers the full 0.05-0.9 MPa range. If your process never exceeds 0.4 MPa, the low-pressure type gives you finer practical control in that band; this unit also arrives with a square bar-scale gauge fitted and no mounting bracket (J), and takes a 3/8 inch NPT port.
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.