Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU
The AirTAC Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU is a genuine single acting, pull (spring extend) aluminum-barrel mini round cylinder with a Ø40mm bore and 20mm stroke, G1/4 air ports and a fixed rubber bumper. Air drives the pull (work) stroke and the spring returns the rod — it rests extended on air loss.
- BoreØ40 mm
- Stroke20 mm
- Port sizeG1/4
- Acting typeSingle acting, pull (spring extend)
- Rod threadM12×1.25
- CushionFixed rubber bumper
About the Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU
The AirTAC MTBL40X20SU is a single-acting pull-type, spring-extend aluminum mini cylinder. Air retracts the M12x1.25 rod to perform the useful work stroke, while an internal spring drives it back out. It develops a usable pull force of 339.1 N at 0.5 MPa and 550.1 N at 0.7 MPa. The 20 mm stroke is well-suited for short, high-force tensioning or drawing mechanisms closed in tight spaces.
This SKU features a built-in magnet (-S) for compatibility with AirTAC CMSG reed and DMSG/EMSG electronic sensor switches to detect rod position. The U suffix denotes a rigid flat-end back cover. It uses a G1/4 port and a fixed rubber bumper instead of an adjustable air cushion. The riveted rolling-packed barrel and 20 µm hard-chrome plated carbon-steel rod ensure reliable sealing and friction reduction.
The fail-safe extended home position means the rod pushes out upon air loss or valve shutoff, making it ideal for applications requiring a safe resting state. The overall length follows the A + 2 x stroke formula, resulting in a longer body than double-acting equivalents. Minimum operating pressure is 0.2 MPa to overcome the return spring, and no external load should be applied during the unpowered extend return stroke.
Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU Technical Specifications
| Model | Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull (spring extend) |
| 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 100 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 Pull Force (Ø40mm)
| Pressure | Pull force (net of spring) |
|---|---|
| 0.5 MPa | 339.1 N |
| 0.7 MPa | 550.1 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 MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU
| MTBL | Single acting, pull (spring extend) 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: MSBL (single-acting push), MBL/MBLC (double acting), MBLD (double rod).
Where the Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU Is Used
Injection Mold Ejection
Pulls a mold core or ejector pin back against 339.1 N of force at 0.5 MPa to safely clear the mold cavity during part ejection, relying on the fail-safe extended home to prevent mold damage on air loss.
Packaging Flap Tensioning
Draws a carton sealing mechanism closed with 550.1 N at 0.7 MPa, using the short 20 mm stroke to maintain precise tension on packaging materials before the sealing head descends.
Stamping Press Clutch
Retracts a mechanical clutch latch on a small stamping press, using the spring-extend function to positively lock out the press drive when the 3/2 control valve exhausts the air line.
Is the Airtac MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU the Right Cylinder?
To size this cylinder correctly, note that the 40 mm bore generates 339.1 N of usable pull force at 0.5 MPa. If you need less force, stepping down to the 32 mm bore yields 224.8 N at 0.5 MPa; if you need more power within the series, 40 mm is the largest available single-acting bore. The minimum operating pressure is 0.2 MPa, and the system must operate between 0.2-1.0 MPa at a speed of 50-800 mm/s.
Choose this MTBL pull-type over the MSBL push-type if your mechanism requires a fail-safe extended home position upon air loss. Unlike a double-acting MBL, this cylinder does not hold a mid-stroke load without air. For replacements, match the 40 mm bore, 20 mm stroke, G1/4 port, PT thread, U flat-end back cover, and the -S magnet option. The fixed rubber bumper absorbs end-of-stroke impact but is not a lock.
Quick checklist
- ✓ Usable pull force at your pressure (min 0.2 MPa)
- ✓ Fail-safe rest position (extended)
- ✓ 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 MTBL Single Acting Aluminum Alloy Mini Cylinder MTBL40X20SU FAQ
The MTBL40X20SU provides a usable pull force of 339.1 N at 0.5 MPa and 550.1 N at 0.7 MPa. Because an internal spring opposes the air stroke, the minimum operating pressure is 0.2 MPa, and the operating range is 0.2-1.0 MPa.
The -S suffix indicates a built-in magnet for use with AirTAC CMSG reed and DMSG/EMSG electronic sensor switches to detect rod position. As a single-acting pull cylinder, air retracts the rod, and the spring extends it; upon air loss, the spring drives the rod to a fail-safe extended home position. No external load should be applied during this unpowered extend stroke.
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