The AirTAC GFR400-10 AirTAC Filter Regulator 3/8 in NPT, 5 um 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 filter regulator: it removes water and particulate from compressed air and sets downstream pressure in one body, so a single 3/8 in NPT connection handles both jobs. This configuration carries the 5 um element (code W) for finer filtration than the standard 40 um grade, a differential-pressure drain that bleeds accumulated condensate as pressure drop across the element rises, and a fitted square gauge reading in psi. The regulator is the standard type with a 0.15-0.9 MPa (20-130 psi) adjustment range, the polycarbonate bowl suits the 400 size, and the mounting bracket is included.
This is a genuine AirTAC part from the GFR400 series, one of four sizes (200, 300, 400, 600) in the GFR line, with port sizes from 1/8 in to 1 in, manual or automatic drain options, a 40 um or 5 um element, MPa, psi or bar gauge 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 3/8 in NPT, 5 um |
|---|---|
| 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 — square, psi scale |
| Reflux valve | Not fitted |
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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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. |
| (blank) | No reverse-flow valve (the default). |
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 clean, regulated air to the tool-changer and clamping circuits of a CNC machining centre, with the 5 um element guarding fine pilot valves on a 3/8 in drop from the shop main.
Sits at the drop feeding the diverters and pusher cylinders on a carton packaging conveyor, holding a steady set pressure so case-eject strokes stay repeatable through the shift.
Conditions the compressed air feeding analytical and test-bench instruments, where the 5 um grade and a stable regulated setpoint protect sensitive pneumatic controls downstream.
Start with the port step: the GFR400-10 is the 400 size on a 3/8 in NPT thread, one step up from the 300 series, so move up a size if your line draws more air than the 300 frame serves. Choose the drain to match attendance: this unit's differential-pressure drain needs no daily attention but only clears while air is flowing; pick automatic (A) for unattended drain-on-level, or manual (M) where an operator drains on schedule. The 5 um element here suits finer protection; the standard grade is 40 um. The fitted square gauge reads psi; MPa and bar scales and an external round gauge are alternatives, and G (BSPP) or PT threads can be ordered instead of NPT.
Because AirTAC publishes flow as curves rather than a single rated figure, we do not quote a flow number here. Send us your application's air demand and we will confirm sizing against the datasheet before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back 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 figure, so we do not quote a flow number. Tell us your application's air demand and we will confirm the sizing against the datasheet on request before you order.
The W code in GFR400-10 selects the 5 um filtration grade instead of the standard 40 um, for finer protection of downstream equipment. With no drain letter in the code, the bowl uses the differential-pressure drain, which discharges condensate as the pressure drop across the element rises; automatic (A) and manual (M) drains are order 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.