Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X50SU
The AirTAC Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X50SU is a genuine single acting, push (spring return) aluminum-barrel mini round cylinder with a Ø40mm bore and 50mm 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
- Stroke50 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 MSBL40X50SU
The AirTAC MSBL40X50SU is a 40 mm bore, 50 mm stroke single-acting push-type mini cylinder. Air extends the rod to deliver 439.6 N of usable push force at 0.5 MPa, while an internal spring retracts it to a fail-safe home position when air is removed. This 50 mm stroke is well suited for short, high-force ejection or pressing tasks in compact machinery. A built-in magnet (-S) allows CMSG reed or DMSG/EMSG electronic sensors to detect rod position.
As the largest bore in the MSBL family, it uses a G1/4 port and a 16 mm hard-chrome carbon-steel rod with an M12x1.25 end thread. The U flat-end back cover provides rigid rear mounting. Because it is single-acting, it requires only a 3/2 solenoid valve and one air line, saving plumbing space. A fixed rubber bumper absorbs end-of-stroke impact, as there is no adjustable air cushion. Note that the return spring only retracts the rod itself; apply no external load during the return stroke.
Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X50SU Technical Specifications
| Model | Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X50SU |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MSBL40X50SU
| MSBL | Single acting, push (spring return) aluminum-barrel mini cylinder. |
|---|---|
| 40 | Bore size in mm (20/25/32/40). |
| ×50 | 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 MSBL40X50SU Is Used
Stamping Press Ejector
Ejects formed sheet metal parts from a die using 439.6 N of push force at 0.5 MPa, with the spring ensuring the rod retracts clear of the press bed on air loss.
Packaging Flap Tucking
Tucks carton flaps on a packaging line; the 50 mm stroke delivers a firm fold, while the fail-safe retracted home prevents jams if the airline drops out.
PCB Router Clamping
Holds a PCB panel flat against a routing fixture during depaneling. The -S magnet feeds a DMSG electronic sensor to confirm the clamp is fully extended before routing begins.
Is the Airtac MSBL Aluminum Alloy Mini Cylinder MSBL40X50SU the Right Cylinder?
Select this 40 mm bore when you need the maximum push force available in the MSBL range (439.6 N at 0.5 MPa, 690.8 N at 0.7 MPa). If your application requires less force, the next size down is the 32 mm bore, which provides 281.3 N at 0.5 MPa. As 40 mm is the largest available MSBL bore, stepping up further requires switching to a double-acting MBL cylinder. Remember that the minimum operating pressure is 0.2 MPa, as the air must first overcome the return spring.
When replacing this unit, match the 40 mm bore, 50 mm stroke, G1/4 port, PT thread, U flat-end back cover, and -S magnet. If your process needs force in both directions or must hold a mid-stroke load without air, choose a double-acting MBL instead; the MSBL spring only retracts the rod to rest. If you need air to pull rather than push, consider the MTBL single-acting pull type.
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 MSBL40X50SU FAQ
The usable push force, which is already net of the return spring, is 439.6 N at 0.5 MPa and 690.8 N at 0.7 MPa. The operating pressure range is 0.2-1.0 MPa; a minimum of 0.2 MPa is required because the air must first overcome the internal spring to extend the rod.
Air extends the rod for the work stroke, and when air is released, the internal spring retracts it to a fail-safe home position. The -S code indicates a built-in magnet, allowing you to fit AirTAC CMSG reed or DMSG/EMSG electronic switches for position detection. Do not apply external load during the spring return stroke.
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