Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN is a genuine two-in-one filter & regulator — a diversion-type water/particulate filter and a balanced pressure regulator built into ONE body. It has 3/4" ports, a 40 µm filter element and regulates 0.15 - 0.4 MPa (20 - 58 psi). It has no lubricator, so it adds no oil to the airflow.
- TypeFilter & regulator
- Port size3/4"
- Pressure range0.15 - 0.4 MPa (20 - 58 psi)
- Filtering grade40 µm
- Bowl materialMetal
- Drainsemi-auto + manual
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN
The GAFR500C20LJN is a filter and regulator combined in one metal-bodied unit, cleaning incoming air and holding a steady outlet pressure without needing a separate filter and regulator pair. This lower-pressure model regulates from 0.15 to 0.4 MPa (20-58 psi) with a 40 um element, and the 3/4in port suits medium-to-large machine headers.
The 108 cc condensate bowl collects water and solids spun out by the diversion structure, while the semi-auto and manual drains give you both automatic purging and a manual backup. Weighing 950 g, this unit needs a proper panel or frame mount rather than support from the tubing alone.
Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN |
|---|---|
| Series | GAFR500 filter & regulator |
| Port size | 3/4" (PT thread) |
| Filtering grade | 40 µm |
| Pressure range | 0.15 - 0.4 MPa (20 - 58 psi) |
| Type | Lower pressure |
| Bowl material | Metal |
| Drain type | Semi-auto drain + manual drain |
| Fluid | Air |
|---|---|
| Max. pressure | 1.0 MPa (145 psi) |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Capacity of drain bowl | 108 cc |
| Bracket | Not included (J) |
| Weight | 950 g |
Specifications follow the official AirTAC GAFR catalogue (pages 235-236). Air must not freeze in the unit. No gauge is supplied with this model — the gauge connection on a GAFR500 is 1/4" if you add one. This unit filters and regulates only; it does not add lubrication.
Model Code: Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN
| GAFR500 | GA500 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| C | Bowl material: Metal. Available on this body: PC (blank), Metal (C), Nylon (N). |
| 20 | Port size 3/4". This body offers 20 = 3/4". |
| (blank) | Drain: Semi-auto drain + manual drain. |
| L | Lower pressure type — 0.15 - 0.4 MPa (20 - 58 psi). This body offers Standard (S) or Lower pressure (L). |
| J | No bracket (J) — supplied without the mounting bracket. |
| N | No pressure gauge; 1/4" gauge connection. |
| (blank) | Filtering grade 40 µm. |
| (blank) | PT thread; gauge scale MPa / psi. |
| (blank) | No reverse-flow valve. |
The filter and the regulator are ONE body here — there is no separate GAF filter or GAR regulator part to assemble. Need lubrication downstream too? Add a lubricator by ordering the matching GAFC500-20 F.R.L. combination instead.
Size Class & Flow Envelope
- GAFR2001/8"-1/4" · 2000 L/min
- GAFR3001/4"-1/2" · 3500 L/min
- GAFR4003/8"-1/2" · 7000 L/min
- GAFR5003/4" · 8000 L/min
- GAFR6003/4"-1" · 12000 L/min
Figures are the end of the flow curve plotted in the AirTAC catalogue at 0.7 MPa inlet pressure — a sizing envelope for comparing bodies, not a rated flow. Read the catalogue curve for a real duty point. Outlet pressure falls as flow rises, so size a body with headroom above your peak demand.
| This model | GAFR500 · 3/4" · curve to 8000 L/min |
|---|---|
| One size down | GAFR400 |
| One size up | GAFR600 (curve to 12000 L/min) |
| Add a lubricator | GAFC500-20 (F.R.L. combination) |
Where the Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN Is Used
Machine tool header
Feed a 3/4in header serving several machine tools with filtered air held at a stable lower pressure, protecting sensitive valves from supply swings.
Conveyor line control
Regulate air for conveyor diverters and stops where a 0.4 MPa ceiling prevents over-force on light mechanisms, with the metal bowl resisting rough washdown areas.
Test bench supply
Provide a clean, lower-pressure air source for bench testing components, using the 1/4in gauge connection to monitor set pressure precisely.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN the Right Air-Prep Unit?
Choose the GAFR500C20LJN when your line needs 3/4in ports and a lower regulated ceiling of 0.4 MPa. The metal bowl suits demanding environments, and the omitted bracket (J) means you plan to panel-mount it or reuse an existing bracket. No gauge is supplied, so the 1/4in gauge connection is ready for a gauge you add later; the PT thread carries an MPa/psi scale if you fit one. The semi-auto plus manual drain handles normal condensate, and the 40 um element covers general shop air. If oil is needed downstream, order the matching GAFC500-20 combination instead of expecting this unit to lubricate. With a 1.0 MPa max supply, you have about 0.6 MPa of headroom above the 0.4 MPa top of the regulated range.
Quick checklist
- ✓ Body size for your peak flow (3/4" here)
- ✓ Standard 0.9 MPa or lower-pressure 0.4 MPa
- ✓ Bowl material: PC (blank), Metal (C), Nylon (N)
- ✓ Drain: semi-auto + manual, or automatic
- ✓ Element 40 µm or 5 µm
- ✓ Bracket kept or removed (J); add a lubricator = GAFC
Installation & Maintenance Notes
- check Install with the airflow arrow: IN to OUT, gauge/knob accessible.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Set pressure with the pressed-in self-locking knob; pull to adjust, press to lock.
- check Drain condensate before the 108 cc bowl fills.
- check Keep the unit above freezing (-5 to +70 °C, unfreeze).
- check Support the 950 g unit on its bracket, not on the tubing.
This is a filter and regulator only — it delivers filtered, pressure-set air with no added oil. If a downstream tool needs lubrication, add a separate lubricator or order the GAFC500-20 combination; do not expect an oil mist from this unit.
Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN FAQ
Working pressure range is 0.15-0.4 MPa (20-58 psi), maximum pressure is 1.0 MPa (145 psi), proof pressure is 1.5 MPa (215 psi), and temperature range is -5 to 70 C. The drain bowl holds 108 cc, the unit weighs 950 g, and the port is 3/4in.
The N code after the port means no gauge is fitted, leaving a 1/4in gauge connection for you to add one. The J code omits the mounting bracket, so you mount it to an existing panel or frame rather than using the included bracket that other versions ship with.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Air-Preparation Units
Request a Quote for Airtac GAFR Adjustable Filter Regulator GAFR500C20LJN
Send us the quantity, thread type (PT / G / NPT) and destination. We confirm price, stock and lead time — usually within 7-8 hours.