Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U
The AirTAC Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U is a genuine double-acting aluminum-barrel mini round cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and a fixed rubber bumper. Its compact riveted body suits push, hold and clamp motion in tight machine spaces.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionRubber bumper (MBLC variant: adjustable air cushion)
About the Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U
The AirTAC MBL40X125U is a compact double-acting aluminum mini round cylinder engineered for tight machine spaces. Operating at 0.5 MPa, it provides 628 N of push force and 528 N of pull force over a 125 mm stroke, making it well-suited for mid-range actuation tasks. The U suffix designates a rigid flat-end rear cover for stable, fixed mounting.
Unlike ISO 6432 stainless steel bodies, this unit features a riveted rolling-packed aluminum barrel that is permanently crimped, prioritizing a small footprint over field-rebuildability. The carbon steel piston rod is treated with 20 um hard-chrome plating for wear and corrosion resistance, while a heterogeneous two-way piston seal retains grease for extended operational life. Because this specific SKU lacks the -S magnet suffix, it cannot support a CMSG, DMSG, or EMSG position sensor switch.
Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U Technical Specifications
| Model | Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U
| MBL | Aluminum-barrel mini round cylinder, double acting. |
|---|---|
| 40 | 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 MBL Aluminum Alloy Mini Cylinder MBL40X125U Is Used
PCB Drill Bit Changer
Actuates the tool carousel in CNC PCB drilling spindles, using its 628 N push force to positively lock the tool holder in the spindle nose.
Carton Flap Folder
Folds minor flaps on packaging lines, where the 125 mm stroke clears the carton width and the rigid U flat-end cover mounts directly to the side rail.
Connector Insertion Press
Pushes M.2 edge connectors into motherboard sockets during electronics assembly, relying on the 528 N pull force to retract the insertion head.
Is the Airtac MBL Aluminum Alloy Mini Cylinder MBL40X125U the Right Cylinder?
For lower force needs, stepping down to the 32 mm bore yields 402 N of push force at 0.5 MPa, while moving up to the 50 mm bore provides 981 N for heavier payloads. If your cycle speed demands end-of-stroke deceleration, select the MBLC variant, which replaces the fixed rubber bumper with an adjustable air cushion. Should your application require the rod to stay in place after a loss of air pressure, note that this base MBL model will drift or drop its load; an external rod lock or pilot-operated check valve is required for position holding.
With a 125 mm stroke, the 16 mm rod is moderately exposed; for longer unsupported moves, side-load tolerance remains low, so utilizing an external guide rail or switching to an MBLD double-rod cylinder is recommended to prevent rod-bearing bending. Replacement matching requires a 40 mm bore, 125 mm stroke, G1/4 port, PT thread, U back cover, and no 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 MBL Aluminum Alloy Mini Cylinder MBL40X125U FAQ
At 0.5 MPa, this 40 mm bore cylinder outputs 628 N of push force and 528 N of pull force. At 0.7 MPa, push force increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa, with a proof pressure of 1.5 MPa.
No, the base MBL40X125U uses a fixed rubber bumper to soften end-of-stroke impacts, not an adjustable cushion screw. If your application requires adjustable air cushioning for heavier or faster moving loads, you must specify the MBLC variant.
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