The AirTAC GR400-10LJCK AirTAC Low-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 GR400-10LJCK is an AirTAC GR-series air pressure regulator in the 400 size with a 3/8 in NPT port. This is the low-pressure (L) type, so its adjustment range tops out at 0.4 MPa - the right choice when the downstream circuit must never see standard-line pressure. The code also specifies a round pressure gauge reading in bar, a built-in reverse (check) valve that holds downstream pressure if the upstream supply is lost, and no mounting bracket; as a GR unit it is also panel-mountable. Like every GR regulator it contains no filter, no bowl and no lubricator - it does one job: regulated compressed air.
This is a genuine AirTAC part. The GR line spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, in standard or low-pressure types, with gauge and thread options to match your plant. Flow is published as curves rather than a single rated figure, so send us your application and we will confirm the sizing and datasheet figures on request before you order.
| Model | GR400-10LJCK AirTAC Low-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 — round, bar 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). |
| C | Gauge shape: Round. 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. |
| 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 machining fixture that clamps delicate or finished parts, the low-pressure type caps the regulated pressure at 0.4 MPa so the clamp cylinders grip without marking the workpiece, while the check valve holds clamp force if shop air drops.
On a cartoning or case-packing conveyor, hold-down and pusher cylinders run best at gentle pressure; this 3/8 in low-pressure regulator lets the line set one safe pressure for all actuators on that drop, with the bar gauge giving operators a quick visual reference.
In a pilot plant or test bench where instruments and small pneumatic devices are fed from a 3/8 in header, the low-pressure GR keeps the supply within a 0.4 MPa ceiling, and the NPT port drops straight into standard US instrumentation piping.
Start with the port step: the 400 size takes a 3/8 in port, and larger sizes carry more flow - match the size to the air demand of the circuit rather than to the pipe alone. This code is the low-pressure (L) type with a maximum regulated pressure of 0.4 MPa; if your process needs up to 0.9 MPa, choose the standard GR type instead. The gauge here is the external round style reading in bar; MPa and psi scales are available as alternative codes, and the embedded square gauge is the other style option. Thread is NPT on this unit - PT is the standard catalogue thread, with G (BSPP) and NPT as orderable options. The K code adds a reverse/check valve, useful where downstream pressure must be held on supply loss, and J means no bracket is supplied (panel mounting is still possible).
One honest note on sizing: AirTAC publishes GR flow as curves, not as a single rated number, so we do not quote a flow figure here. Ask us to confirm the curve data 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 regulator flow as curves rather than a single rated figure, so we do not quote a l/min, m3/h or SCFM number on this page. Send us your application details and we will confirm the flow-curve data and full datasheet figures on request before you order.
The L in the code marks the low-pressure type of the GR series, whose adjustment range tops out at 0.4 MPa. It suits circuits that must run below standard line pressure. If you need regulation up to 0.9 MPa, order the standard GR type instead - same sizes and ports, higher range. Maximum inlet pressure is 1.0 MPa (145 psi) either way, and the GR works from -20 to 70 C.
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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.