Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU
The AirTAC Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU is a genuine double-acting aluminum-barrel mini round cylinder with a Ø20mm bore and 125mm stroke, G1/8 air ports and a fixed rubber bumper. Its compact riveted body suits push, hold and clamp motion in tight machine spaces.
- BoreØ20 mm
- Stroke125 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionRubber bumper (MBLC variant: adjustable air cushion)
About the Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU
The AirTAC MBLC20X125SU is a compact double-acting aluminum mini cylinder engineered for tight spaces. It features a 20mm bore and a 125mm stroke, delivering 157N of push force and 132N of pull force at 0.5 MPa. The built-in magnet (-S) enables precise rod-position detection using AirTAC CMSG, DMSG, or EMSG sensor switches, while the U flat-end back cover provides a rigid rear mounting face.
Unlike the base MBL series with its fixed rubber bumper, this MBLC variant utilizes a screw-adjustable pneumatic air cushion at both stroke ends. This allows you to tune the end-of-stroke deceleration to match your load and speed, effectively cutting impact shock and vibration on faster cycles. The riveted rolling-packed aluminum barrel keeps the body light and compact, and the Ø8mm carbon-steel rod features 20µm hard-chrome plating paired with a heterogeneous two-way grease-retaining piston seal for extended service life.
Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU Technical Specifications
| Model | Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Rubber bumper (MBLC variant: adjustable air cushion) |
| Max stroke | Up to 500 mm |
Specifications follow the official AirTAC MBL series datasheet. Confirm against the product label before installation. Standard stroke to 500 mm (special order to 800 mm). Thread options: PT / G / NPT.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU
| MBL | Aluminum-barrel mini round cylinder, double acting. |
|---|---|
| 20 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related variants: MBLC (adjustable cushion), MBLD (double rod), MBLJ (adjustable stroke), MSBL/MTBL (single acting).
Where the Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU Is Used
PCB Handling Gate
Actuates a small routing gate on a PCB conveyor. The 125mm stroke shifts the gate cleanly, while the tuned air cushion stops the 157N push without jarring delicate populated boards.
Pharmaceutical Tray Ejector
Pushes light plastic trays out of a filling carousel. The U flat-end cover mounts rigidly to the machine frame, and the -S magnet confirms tray ejection for the PLC.
Small-Part Sorter Diverter
Diverts small machined fasteners into a secondary bin. The 132N pull force at 0.5 MPa retracts the diverter arm quickly, with the adjustable cushion preventing end-cap slap at high frequency.
Is the Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU the Right Cylinder?
At 0.5 MPa, this 20mm bore yields 157N push and 132N pull. If your application requires less force, there is no smaller standard MBL size, so you would rely on pressure regulation. If you need more power, stepping up to the 25mm bore provides 245N push and 206N pull at the same pressure. Choose the MBLC over the base MBL when your cycle speeds are higher or the moved mass is greater, as the fixed bumper cannot always absorb the impact. Remember that the adjustable air cushion only decelerates the piston near the ends; it is not a brake or load lock. If the machine loses air, the rod will drift and drop. For exact replacement, match the 20mm bore, 125mm stroke, G1/8 port, PT thread, U flat-end back cover, and the -S magnet.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (LB / FA / SDB) and back cover (CA pivot / U flat-end).
- check Installation by qualified personnel per AirTAC docs.
Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC20X125SU FAQ
The 20mm bore uses a G1/8 port and an Ø8mm rod with an M8x1.25 rod-end thread. At 0.5 MPa it provides 157N push and 132N pull force. At 0.7 MPa it provides 220N push, and the maximum theoretical force is 32 kgf at 1.0 MPa.
The MBLC20X125SU has a screw-tunable needle at both ends that traps a pocket of air to decelerate the piston smoothly before it hits the end cover. You adjust the needle to match your specific load and speed, which reduces impact noise and vibration on fast cycles. It is a deceleration device, not a mechanical lock, so it will not hold the rod in place if air pressure is lost.
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