The AirTAC GFR400-10 AirTAC Filter Regulator NPT3/8 with 5 um Filter is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" ports, a differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR400-10 is a size-400 filter regulator: it removes water and particulate from compressed air and sets a stable downstream pressure in one compact body. This configuration is threaded NPT3/8 (3/8 in), carries the fine 5 um filter element instead of the standard 40 um, drains condensate by differential pressure, and is fitted with a round gauge reading in psi plus a reverse (check) valve. It is supplied without a mounting bracket, and the polycarbonate bowl suits the non-freezing -5 to 70 C operating range.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, embedded square or external round gauges in MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator NPT3/8 with 5 um Filter |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Standard type |
| Adjusting mechanism | Balanced type |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Drain type | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi scale |
| Reflux valve | Fitted (reverse flow permitted) |
Specifications follow the official AirTAC G-series air-preparation data. The regulating band is set by the drain type: automatic and differential-pressure drains regulate 0.15 - 0.9 MPa, a manual drain regulates 0.05 - 0.9 MPa. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). Air must not freeze in the unit. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GFR400 | G-series filter regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard type. 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| 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, drain, type, bracket, gauge, shape, scale, grade, thread, reflux — a blank position takes the default. Example: GFR300-08 is a 300 body, PT1/4", differential drain, standard type, bracket included, gauge fitted, 40 µm, PT thread, no 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. The GFR600 uses an aluminium-alloy bowl; the 200, 300 and 400 bodies use PC.
| This model | GFR400 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Feeds cleaned, pressure-set air to pneumatic clamps and tool-change cylinders on a machining centre, with the 5 um element guarding spool valves from fine particulate and the check valve holding downstream pressure if the main supply drops.
Conditions the air feeding spray guns and air-assisted applicators in a finishing booth, where the 5 um grade helps keep water and fine dirt out of the finish and the regulator holds a steady gun pressure across the shift.
Supplies filtered, regulated air to the cylinders and vacuum generators on a carton-forming and sealing conveyor, with the psi round gauge letting operators verify set pressure at a glance during changeovers.
Start with the port step: size 400 covers the 3/8 in port in this code, and the right size is the one whose flow curve clears your machine's air demand at your working pressure - we can check that against the datasheet on request. Choose the drain to match duty: differential-pressure (as here) drains automatically as flow passes, automatic drains continuously, and manual drains suit intermittent use. Choose the 5 um element (this unit) when downstream equipment needs finer filtration than the 40 um standard, and pick the gauge scale - this one reads psi. Thread is NPT here; PT is the catalogue standard with G and NPT as order options, and the bracket position is set to no bracket on this code.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR400 series as curves, not as a single rated number, so we do not quote a l/min or SCFM figure. Send us your application's air demand and working pressure and we will confirm the sizing against the datasheet curve before you order.
The code W sets the fine 5 um filter element in place of the standard 40 um grade, for applications where finer particulate and water removal matter downstream. The K in the code fits a reverse (check) valve, which helps hold downstream pressure if the upstream supply is interrupted. Both are standard catalogue options on the GFR family.
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.