The AirTAC GFR300-10AJNT AirTAC Filter Regulator NPT3/8 is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" ports, a automatic 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 GFR300-10AJNT is an AirTAC GFR300 filter regulator: a single body that first removes water and particulate from compressed air, then regulates downstream pressure. This configuration is the 300 size with NPT3/8 (3/8 in) tapered ports, 40 um standard filtration, and an automatic drain that ejects collected condensate from the PC bowl without manual attention. It is supplied without a pressure gauge and without a mounting bracket, and no reverse/check valve is fitted.
This is a genuine AirTAC part. The GFR line spans sizes 200, 300, 400 and 600 with a choice of port sizes, PT, G or NPT threads, differential-pressure, automatic or manual drains, and an optional 5 um filter grade (code W). Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjusts from 0.15 to 0.9 MPa (20-130 psi), and the working temperature range is -5 to 70 C (non-freezing). Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-10AJNT AirTAC Filter Regulator NPT3/8 |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Not fitted |
| 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.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| A | Drain: Automatic 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. |
| 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. |
| (blank) | Filtering grade 40 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 | GFR300 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeds clean, regulated air to the clamping cylinders and tool-change actuators on a CNC machining centre, where the 40 um element keeps chips-laden, wet shop air out of the fixtures and the regulator holds a steady clamp pressure.
Conditions the air supply to conveyor diverters, carton sealers and bagging heads on a packaging line, with the automatic drain protecting the valves from condensate during multi-shift running without an operator draining bowls by hand.
Sits on the air header serving bench-top reactors, sample-handling actuators and pneumatic stirrers in a laboratory or pilot plant, delivering filtered air at a set, repeatable pressure to sensitive instruments.
Size and port are the first choice: step up through 200, 300, 400 and 600 as your port size and air demand grow, and match the port to your piping - here NPT3/8 for a 3/8 in NPT line. Drain type is the next real decision: automatic drain (this model) suits unattended or hard-to-reach installations, while manual and differential-pressure drains suit attended duty. Filtration is 40 um standard; specify the W suffix for 5 um where finer protection is needed. A gauge can be added (square embedded or external round, in MPa, psi or bar scales), and PT or G threads are order options alongside NPT. Brackets are optional on this family, so order one if you want panel or wall fixing. Because flow is published as curves rather than a single rated figure, send us your application details 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 GFR series as performance curves rather than a single rated figure, so we do not quote one number for this unit. Tell us your line pressure, set pressure and air demand, and we will confirm the flow from the datasheet curves to check the 300 size and NPT3/8 port suit your application before you order.
The A in the code means the bowl drain is automatic: collected condensate is ejected without manual attention, which suits unattended or hard-to-reach installations. The GFR family is also available with a manual drain (code M) or the differential-pressure drain (blank) as the default; specify the suffix you want when ordering. This unit carries 40 um standard filtration, no gauge, no bracket and no check valve.
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.