Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U
The AirTAC Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U is a genuine single acting, push (spring return) aluminum-barrel mini round cylinder with a Ø40mm bore and 20mm stroke, G1/4 air ports and a fixed rubber bumper. Air drives the push (work) stroke and the spring returns the rod — it rests retracted on air loss.
- BoreØ40 mm
- Stroke20 mm
- Port sizeG1/4
- Acting typeSingle acting, push (spring return)
- Rod threadM12×1.25
- CushionFixed rubber bumper
About the Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U
The AirTAC MSBL40X20U is a compact single-acting push-type, spring-return aluminum mini cylinder. Air extends the rod to perform work, while an internal spring retracts it when air is released, providing a fail-safe retracted home position in the event of air loss. At 40mm bore and 20mm stroke, it generates a usable push force of 439.6 N at 0.5 MPa (690.8 N at 0.7 MPa), making it well-suited for high-force, short-travel ejection or clamping duties.
This U variant features a flat-end back cover for rigid mounting. It uses a G1/4 port and an M12x1.25 rod-end thread. Because it lacks the -S magnet code, this SKU cannot accept a CMSG, DMSG, or EMSG position sensor. The riveted rolling-packed aluminum barrel and 20 µm hard-chrome plated carbon-steel rod provide durable service in tight spaces, while the heterogeneous two-way grease-retaining piston seal maintains lubrication over the short stroke.
Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U Technical Specifications
| Model | Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push (spring return) |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Cushion | Fixed rubber bumper |
| Max standard stroke | Up to 150 mm |
Single-acting minimum working pressure is 0.2 MPa (the air must overcome the return spring). Do not apply an external load during the spring return stroke. Thread options: PT / G / NPT.
Usable Push Force (Ø40mm)
| Pressure | Push force (net of spring) |
|---|---|
| 0.5 MPa | 439.6 N |
| 0.7 MPa | 690.8 N |
These are the usable single-acting forces after the return spring — lower than a same-bore double-acting MBL. Size with a margin.
Model Code: Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U
| MSBL | Single acting, push (spring return) aluminum-barrel mini cylinder. |
|---|---|
| 40 | Bore size in mm (20/25/32/40). |
| ×20 | Stroke length in mm. |
| S | Optional built-in magnet for a CMSG/DMSG/EMSG sensor switch. |
| CA / U | Back cover: CA pivot (clevis) or U flat-end. |
Related: MTBL (single-acting pull), MBL/MBLC (double acting), MBLD (double rod).
Where the Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U Is Used
Punch Press Ejection
Ejects small stamped metal parts from a 40-ton punch press die, using 439.6 N of push force at 0.5 MPa to clear the part before the next cycle.
Woodworking Clamp
Holds a pine workpiece against a routing fence during air extension, with the spring ensuring the clamp retracts safely away from the cutter when air is dropped.
Packaging Flap Fold
Folds cardboard carton flaps on a continuous flow wrapper, relying on the 20mm stroke and fixed rubber bumper to absorb the end-of-stroke impact without damaging the board.
Is the Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U the Right Cylinder?
As the largest standard bore in the MSBL series, the 40mm size offers maximum push force. If 439.6 N at 0.5 MPa is excessive, step down to the 32mm bore, which yields 281.3 N at 0.5 MPa. Because 40mm is the upper limit, there is no larger single-acting MSBL option; for heavier demands, consider a double-acting MBL. A minimum operating pressure of 0.2 MPa is required to overcome the return spring. Remember that the return spring force is small and only meant to retract the rod; never apply an external load during the return stroke. For replacement, match the 40mm bore, 20mm stroke, G1/4 port, PT thread, U flat-end back cover, and no magnet.
Quick checklist
- ✓ Usable push force at your pressure (min 0.2 MPa)
- ✓ Fail-safe rest position (retracted)
- ✓ No external load on the spring return stroke
- ✓ 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 0.2 – 1.0 MPa (min 0.2 to overcome the spring).
- check Apply no external load on the spring return stroke.
- check Avoid side load on the piston rod.
- check Use the correct mounting accessory (LB / FA / SDB) and back cover (CA / U).
- check Installation by qualified personnel per AirTAC docs.
Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X20U FAQ
The MSBL40X20U provides a usable push force of 439.6 N at 0.5 MPa and 690.8 N at 0.7 MPa (roughly 70.5 kgf). Because the air must first overcome the internal return spring, the minimum working pressure is 0.2 MPa, with a maximum operating pressure of 1.0 MPa.
No, this specific SKU lacks the -S code, meaning it has no built-in magnet and cannot accept AirTAC CMSG (reed), DMSG, or EMSG (electronic) sensor switches. If position detection is required, select an MSBL40X20S variant.
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