Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U
The AirTAC Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U 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 MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U
The AirTAC MBLC40X125U is a double-acting aluminum mini cylinder with a 40 mm bore and 125 mm stroke. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for mid-range industrial positioning tasks. Unlike the base MBL series, this variant uses a screw-adjustable pneumatic cushion at both stroke ends. You tune the needle to smoothly decelerate the piston, minimizing end-cover impact and vibration during faster or heavier moves.
This model features a U flat-end back cover for rigid mounting and a built-in riveted rolling-packed aluminum barrel that keeps the body light and compact for tight machine envelopes. It uses a heterogeneous two-way grease-retaining piston seal and a carbon-steel rod with 20 µm hard-chrome plating for wear resistance. Note that this specific SKU lacks a built-in magnet, so it cannot accept CMSG, DMSG, or EMSG position sensors.
Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U Technical Specifications
| Model | Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U |
|---|---|
| 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 MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U
| 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 MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U Is Used
CNC Pallet Clamp
Actuates a mid-force clamping arm on an automated CNC machining center pallet changer, using the 628 N push force to secure aluminum workpieces while the tunable cushion prevents shock at the 125 mm stroke end.
Package Diverter Gate
Drives a routing flap on a packaging line conveyor, where the 125 mm stroke pushes cardboard cartons onto a side belt and the adjustable air cushion ensures quiet, vibration-free stops during continuous high-frequency cycling.
PCB Router Loader
Pushes populated PCB panels into a depaneling router fixture, using the 528 N pull force to retract the loader arm smoothly without jarring delicate solder joints on the board.
Is the Airtac MBLC Aluminum Alloy Mini Air Cylinder MBLC40X125U the Right Cylinder?
Choose this 40 mm bore when your application requires around 628 N of push force at 0.5 MPa. If your load is lighter, step down to the 32 mm bore, which provides 402 N of push force. If you need to move a heavier mass, step up to the 50 mm bore, which offers 981 N of push force. The 125 mm stroke is a standard length, making it readily available for quick replacement.
Select the MBLC over the fixed-bumper MBL when your cycle speeds are high or the moved mass is significant enough that a rubber bumper would wear out too quickly. Keep in mind that the adjustable air cushion only decelerates the piston near the stroke ends; it is not a brake. A plain MBLC cylinder will not hold position if air pressure is lost or exhausted, so add an external rod lock if you need fail-safe positioning. This U flat-end rear cover provides rigid mounting, and the PT tapered port thread is the default specification.
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 MBLC40X125U FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 880 N. The theoretical maximum force is 128 kgf at 1.0 MPa. It uses a G1/4 port and a Ø16 mm carbon-steel rod with an M12x1.25 rod-end thread.
The MBLC40X125U features a screw-adjustable pneumatic cushion at both ends of the stroke. You tune the cushion needle to match your load and speed, trapping a small amount of exhaust air to decelerate the piston smoothly before it hits the end cover. This reduces impact noise and wear compared to a fixed rubber bumper, but it does not lock or hold the rod position when air is removed.
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