The AirTAC GR40010LJNT AirTAC Air Pressure Regulator NPT 3/8 in 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, ordered without a 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 GR40010LJNT is an AirTAC GR-series air pressure regulator, a genuine AirTAC part dedicated to one job: holding a stable, reduced downstream pressure from your compressed-air supply. This size 400 unit carries NPT 3/8 in ports and is the low-pressure (L) type, so its regulation range is up to 0.4 MPa - suited to circuits that must never see full line pressure. 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 family. Per the code, no pressure gauge is fitted and no mounting bracket is supplied, though the GR body is also panel-mountable.
The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and is offered with gauge or no-gauge, bracket or no-bracket, standard or low-pressure regulation, and PT, G (BSPP) or NPT threads. Flow for this series is published as curves rather than a single rated figure, so we confirm the datasheet and flow figures for your application on request.
| Model | GR40010LJNT AirTAC Air Pressure Regulator NPT 3/8 in |
|---|---|
| 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 | Not fitted |
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 finishing line, each spray-gun drop needs air held well below full header pressure so atomising pressure stays repeatable. This low-pressure GR regulator, set within its up-to-0.4 MPa range, sits at the booth drop and holds the gun supply steady through a shift.
Carton-sealing and case-packing machines often use air clamps and hold-downs that must not be slammed at line pressure. Feeding those actuators through this size 400 regulator caps their supply at a gentle, dialled-in pressure while the machine's main circuit runs higher.
Weaving sheds and tenter frames run long manifolds of low-pressure jets and fingers where overpressure distorts the process. A GR400 regulator at each zone branch keeps that branch within its low-pressure window independently of the mill's main compressed-air header.
Start with the port and size step: size 400 with 3/8 in NPT ports suits lines where your downstream demand sits comfortably within the size 400 flow curve - ask us to check the curve against your consumption before ordering. Then set the regulation type: this is the low-pressure (L) version, regulating up to 0.4 MPa; if your circuit needs the standard range up to 0.9 MPa, choose a GR without the L code. Decide on a gauge (this unit has none fitted, but gauge-equipped variants with MPa, psi or bar scales exist), on the thread (PT is the standard; G and NPT are order options), and on the bracket (this code omits it; GR also panel-mounts). Flow is published as curves, not a single rating, so ask us to confirm sizing against your application 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 flow as curves rather than a single rated number, so we do not quote a l/min, m3/h or SCFM figure here. Tell us your inlet pressure, set pressure and expected air consumption, and we will confirm the datasheet and the correct size for your application on request.
L marks the low-pressure regulator type: its adjustment range tops out at 0.4 MPa instead of the standard GR range, which suits circuits that must never receive full line pressure. The N in the code means no pressure gauge is fitted; gauge-equipped GR variants with MPa, psi or bar scales are available if you want a visual setpoint reference.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models are processed and dispatched in 3-5 business 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.