The AirTAC GR40010JNT AirTAC Air Regulator NPT3/8 | 400 Size is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.9 MPa (7 - 130 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 GR40010JNT is an AirTAC GR-series air pressure regulator: it does one job, holding your downstream pressure steady at the setting you choose, regardless of swings in the supply line. This 400-size unit is fitted with a 3/8 in NPT port, and the code tells you exactly how it arrives: no gauge fitted (N), no mounting bracket (J), and the standard pressure type, giving an adjustment range of 0.05-0.9 MPa (7-130 psi). Because it is a regulator only, there is no filter, no bowl and no drain to maintain - pair it with a GF filter upstream if your air needs drying and particle removal before regulation.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, and each size can be ordered with a gauge (square or round, MPa, psi or bar scale), a reverse/check valve, a low-pressure type, and PT, G or NPT threads. 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. We do not quote a single rated flow figure because AirTAC publishes flow as curves; ask us and we will confirm the datasheet figures for your application.
| Model | GR40010JNT AirTAC Air Regulator NPT3/8 | 400 Size |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (NPT thread) |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard 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". |
| (blank) | Standard type — 0.05 - 0.9 MPa (7 - 130 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 - 0.9 MPa (7 - 130 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
On a machining cell where pneumatic clamps and a small press grip parts between operations, the GR40010JNT holds the clamp circuit at a fixed, repeatable setting so grip force does not drift as the plant supply pressure moves through the shift. The 3/8 in NPT port drops straight into the supply drop feeding the fixture manifold, and with no gauge fitted the builder adds their own panel gauge at the setting point.
Carton sealers, case packers and labelling heads run cylinders and air bearings that are sensitive to supply fluctuation. A GR40010JNT mounted at the machine inlet regulates the branch down from the main header to the pressure the machine builder specifies, protecting cycle consistency across the whole line. Panel mounting the regulator body keeps it accessible at the machine's air-inlet panel.
In a process skid where positioners, pilot valves and pneumatic transmitters take air from a shared distribution line, a dedicated GR40010JNT on each branch sets a stable, lower pressure than the header, isolating the instruments from header swings and from neighbouring loads. The standard-type 0.05-0.9 MPa range covers typical instrument branch settings, and the -20 to 70 C rating suits outdoor or unheated skid locations.
Start with the port and size: the 400 body with a 3/8 in NPT port suits lines where the demand sits above the 300-size step - size up to 600 or down to 300/200 depending on the flow your circuit needs, and we will check the published flow curves against your consumption before you order. Then decide the options the code position carries: a gauge (square embedded or external round, in MPa, psi or bar scale) so operators can see and set the downstream pressure; the L low-pressure type if your setting stays at or below 0.4 MPa; the K reverse/check valve if backflow protection is wanted; and the thread - PT is the standard, with G (BSPP) and NPT as order options, as on this unit. Brackets are optional (this one is ordered without, though GR bodies are also panel-mountable).
One honest note on sizing: AirTAC publishes regulator flow as curves, not a single rated number, so there is no figure we can honestly print here. Tell us your line pressure, set pressure and air demand, and we will confirm from the datasheet that the GR400-10 is the right step 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 regulator flow as curves rather than a single rated figure, so there is no honest one-number answer to print. What we can state from the catalogue: this is a 400-size regulator with a 3/8 in NPT port, maximum inlet pressure 1.0 MPa (145 psi) and an adjustment range of 0.05-0.9 MPa (7-130 psi). Send us your supply pressure, set pressure and air consumption, and we will confirm the datasheet flow curves against your application before you order.
Correct: the N in GR40010JNT means no gauge is fitted. GR regulators can be ordered with a gauge instead - an embedded square gauge as standard, or an optional external round gauge - each available in MPa (scale 1), psi (scale 2) or bar (scale 3). If your operators need to see and adjust the downstream pressure at the unit, order the gauge variant; if the regulator feeds a circuit with its own panel-mounted gauge, the N version keeps the unit simpler and lets you use the gauge you already have.
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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.