Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJN
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJN 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 materialNylon
- Drainautomatic
- Pressure gaugeNot fitted
- Weight950 g
About the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJN
The GAFR500N20ALJN is a filter and pressure regulator combined into a single 3/4in body, eliminating the need for separate components. It spins incoming air to separate liquid water and trap solid particles, then delivers a steady outlet pressure within the lower 0.15-0.4 MPa (20-58 psi) range using a 40 um element.
This nylon-bowl unit weighs 950 g and features an automatic drain that clears condensate without manual intervention. The balanced regulator holds the set pressure as supply varies, while the pressed-in self-locking knob resists drift from vibration, making it suitable for fixed installations.
Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJN Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJN |
|---|---|
| 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 | Nylon |
| Drain type | Automatic 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 GAFR500N20ALJN
| GAFR500 | GA500 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| N | Bowl material: Nylon. Available on this body: PC (blank), Metal (C), Nylon (N). |
| 20 | Port size 3/4". This body offers 20 = 3/4". |
| A | Drain: Automatic 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 GAFR500N20ALJN Is Used
Machine header supply
Feed a 3/4in header serving multiple pneumatic actuators on a production line, where the lower pressure range protects sensitive downstream components.
Fixed plant installation
Mount on a frame or panel in a workshop to supply filtered air at a stable low pressure to a bank of regulators, with the automatic drain reducing maintenance rounds.
Low-pressure test rig
Use in a test bench that requires a clean, regulated air supply below 0.4 MPa, where the 40 um element filters particles before they reach precision valves.
Is the Airtac GAFR Adjustable Filter Regulator GAFR500N20ALJN the Right Air-Prep Unit?
Choose this GAFR500 for a 3/4in line needing lower regulated pressure, as the L type tops out at 0.4 MPa. The nylon bowl suits environments where a lighter alternative to metal is preferred, while the automatic drain handles wet or unattended lines. No bracket is included, so plan for panel mounting or existing supports, and note there is no gauge fitted; the 1/4in gauge connection allows adding one later. The 40 um element handles general workshop air, and the PT thread matches standard local fittings. If oil is needed downstream, order the matching GAFC500-20 combination instead. 1.0 MPa max supply leaves about 0.6 MPa above the 0.4 MPa top of the 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 GAFR500N20ALJN FAQ
Working pressure range is 0.15-0.4 MPa (20-58 psi), with a maximum supply of 1.0 MPa (145 psi) and proof pressure of 1.5 MPa (215 psi). Temperature range is -5 to 70 C, drain bowl capacity is 108 cc, and the unit weighs 950 g. It uses a 40 um element and has a 3/4in port.
The N after the port code means no gauge is supplied, leaving a 1/4in connection for adding one if needed. The J code omits the mounting bracket, so you must use existing supports or panel-mount the unit. This reduces initial cost when those accessories are already available.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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