Airtac GAFC Air Service Unit GAFC50020LK
The AirTAC Airtac GAFC Air Service Unit GAFC50020LK is a genuine two-piece F.R.L. combination — a GA-series filter & regulator and a lubricator pre-assembled on one T-shape bracket with quick mounting clamps. It has 3/4" ports, a 40 µm filter element and regulates 0.15 - 0.4 MPa (20 - 58 psi).
- TypeF.R.L. combination
- Port size3/4"
- Pressure range0.15 - 0.4 MPa (20 - 58 psi)
- Filtering grade40 µm
- Bowl materialPC
- Drainsemi-auto + manual
- Pressure gaugeCircular, MPa / psi
- Weight1910 g
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac GAFC Air Service Unit GAFC50020LK
The GAFC50020LK is an F.R.L. combination that brings filtering, regulation and lubrication together in a two-piece build: a filter-regulator body followed by a lubricator on a shared T-bracket. With a 3/4in port and a 1910 g mass, this unit suits a machine header or a multi-station line where a steady, oil-misted supply is needed. The lower-pressure regulator is set for 0.15-0.4 MPa (20-58 psi), so it fits applications that never need more than 0.4 MPa out.
The 40 um element removes moisture and solid grain from the air before it reaches the regulator seat. The 108 cc condensate bowl and 225 cc oil bowl set the service rhythm: the larger oil reservoir means fewer top-ups on a busy line. A circular gauge is fitted, reading in MPa and psi for the default PT thread. The reverse-flow (reflux) valve is fitted, and the catalogue shows it as a separate pneumatic symbol. The semi-auto drain dumps condensate when pressure drops, while the manual drain gives on-demand control.
Airtac GAFC Air Service Unit GAFC50020LK Technical Specifications
| Model | Airtac GAFC Air Service Unit GAFC50020LK |
|---|---|
| Series | GAFC500 F.R.L. combination |
| 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 | PC |
| 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 |
| Capacity of oil bowl | 225 cc |
| Recommended lubricant | ISO VG 32 or equivalent |
| Weight | 1910 g |
Specifications follow the official AirTAC GAFC catalogue (pages 219-220). Air must not freeze in the unit. The fitted circular gauge reads in MPa / psi, set by the PT thread code.
Model Code: Airtac GAFC Air Service Unit GAFC50020LK
| GAFC500 | GA500 series F.R.L. unit — sets ports, bowl capacity and weight. |
|---|---|
| (blank) | Bowl material: PC. 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). |
| (blank) | Circular pressure gauge fitted. |
| (blank) | Filtering grade 40 µm. |
| (blank) | PT thread; gauge scale MPa / psi. |
| K | Reverse-flow (reflux) valve attached. |
Constituent units, orderable separately as spares: GAFR500-20 filter & regulator, GAL500-20 lubricator — both share this body and port. A GAFC has two units, not three: the filter and the regulator are one body.
Size Class & Flow Envelope
- GAFC2001/8"-1/4" · 1750 L/min
- GAFC3001/4"-1/2" · 3500 L/min
- GAFC4003/8"-1/2" · 6000 L/min
- GAFC5003/4" · 7000 L/min
- GAFC6003/4"-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 | GAFC500 · 3/4" · curve to 7000 L/min |
|---|---|
| One size down | GAFC400 |
| One size up | GAFC600 (curve to 12000 L/min) |
| Build order | Filter & regulator → bracket → lubricator |
Where the Airtac GAFC Air Service Unit GAFC50020LK Is Used
Machine tool lubrication
Feed a CNC lathe's way-lubrication system with a steady 0.3 MPa air supply and a metered oil mist, keeping slideways and bearings coated without over-oiling.
Multi-station assembly line
Supply a pallet conveyor's pneumatic clamps and stoppers with filtered, regulated air and oil mist, ensuring consistent actuation across several workstations.
Packaging machine air prep
Protect a carton erector's cylinders and valves from moisture and particulates while adding a fine oil mist to extend seal life in continuous operation.
Is the Airtac GAFC Air Service Unit GAFC50020LK the Right Air-Prep Unit?
Choose the GAFC50020LK when your line needs a 3/4in port and a regulated output capped at 0.4 MPa. The L type tops out at 0.4 MPa, so if the machine may ever need more pressure, this is the wrong part - step up to the standard S type instead. The PC bowl is the default build; confirm it suits your surroundings, as the catalogue gives no material-specific data. The semi-auto and manual drains are both fitted, so condensate is handled either automatically on pressure drop or manually when you choose. The 40 um element is the standard grade; select the W option if you need 5 um filtration for finer particles. The PT thread carries a gauge scale of MPa/psi, matching the fitted circular gauge. The reverse-flow valve is included, so no separate valve is needed for that function. Spare parts are GAFR500-20 and GAL500-20, both orderable separately. 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, so plan your inlet pressure accordingly.
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
- ✓ Thread & gauge scale (PT / G / NPT)
Installation & Maintenance Notes
- check Install with the airflow arrow: filter-regulator first, lubricator last.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Fill the oil bowl with ISO VG 32 or equivalent only.
- check Drain condensate before the 108 cc bowl fills.
- check Keep the unit above freezing (-5 to +70 °C, unfreeze).
- check Support the 1910 g unit on its bracket, not on the tubing.
The lubricator adds an oil mist downstream of the regulator. If any part of the line must stay oil-free, use a plain GAFR500-20 filter-regulator on that branch instead of the full combination.
Airtac GAFC Air Service Unit GAFC50020LK FAQ
The GAFC50020LK operates at 0.15-0.4 MPa (20-58 psi) with a max pressure of 1.0 MPa (145 psi) and a proof pressure of 1.5 MPa (215 psi). It has a 40 um element, a 108 cc condensate bowl, a 225 cc oil bowl, and weighs 1910 g. The temperature range is -5 to 70 C, and the recommended lubricant is ISO VG 32. It uses a PT thread and comes with a circular gauge reading MPa/psi.
The K indicates a reverse-flow (reflux) valve is fitted. This valve is shown as a separate pneumatic symbol in the catalogue. The GAFC50020LK includes it, so you do not need to add one separately for that function.
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