The AirTAC GR40015LJC3T AirTAC Air Pressure Regulator NPT1/2 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 PT1/2" 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 GR40015LJC3T is an AirTAC GR-series air pressure regulator in the size-400 body, fitted with 1/2 in NPT ports. This is the low-pressure (L) type, so it regulates outlet pressure up to 0.4 MPa, and it carries the maximum working inlet pressure of 1.0 MPa (145 psi) common to the G series. A round pressure gauge scaled in bar is included so the set pressure can be read directly, and the unit is supplied without a mounting bracket; the GR family is also panel-mountable. As a pure regulator it performs pressure control only - there is no filter bowl and no lubricator in this unit. Its operating temperature range is -20 to 70 C, wider than the rest of the G family.
This is a genuine AirTAC part. The GR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in standard or low-pressure regulation, with or without a gauge (square embedded or round external, scaled in MPa, psi or bar), with or without a bracket, and with an optional reverse/check valve. Flow figures for the GR series are published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GR40015LJC3T AirTAC Air Pressure Regulator NPT1/2 |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT1/2" (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 | 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| (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 · PT1/2" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
Pneumatic clamps on a machining fixture often need a gentle holding pressure well below line pressure. This low-pressure GR400 regulator, set from its bar-scaled gauge, holds the clamp circuit at the set point while the 1/2 in NPT ports match the main air drop to the cell.
Bench-top lab equipment fed from a shop air main needs a steady, low set pressure. This regulator steps the supply down to the instrument's working range, and the -20 to 70 C operating window covers typical indoor lab conditions.
Hot-glue and coating heads on packaging lines run best at low, stable air pressure. Placed at the drop to the applicator station, this size-400 regulator with its round bar gauge lets operators set and check the pressure at the point of use.
Start with the port size: this unit steps up to 1/2 in NPT on the size-400 body, the right step when your line flow outgrows 3/8 in. Because this is the L (low-pressure) type, it suits circuits whose set point sits below 0.4 MPa; for higher set pressures choose a standard GR. The included round gauge is scaled in bar - if your team reads MPa or psi, the same body can be ordered with scale 1 or 2. Thread is a real choice: PT is the AirTAC standard, while G (BSPP) and NPT are catalogue options you order explicitly - this code is the NPT version. Bracket J means no bracket is fitted; order the bracket variant if you want panel or surface mounting hardware. One honest routing note: GR flow is published as curves, not a single rated figure, so send us your application flow and we will confirm 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 GR-series flow as curves rather than a single rated figure, so we do not quote a number. Tell us your line flow and set pressure and we will confirm the sizing against the datasheet on request before you order.
The L in the code marks the low-pressure version: its regulation range tops out at 0.4 MPa instead of the standard GR range. It still takes up to 1.0 MPa (145 psi) at the inlet. If your set point needs to go higher, order a standard GR400 in the same port and thread options.
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.