Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U
The AirTAC Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U is a genuine single acting, pull (spring return) round-body mini air cylinder with a Ø40mm bore and 125mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke125 mm
- Port size1/4"
- Acting typeSingle acting, pull (spring return)
- Rod threadM12×1.25
- CushionFixed TPU bumper pads
About the Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U
Delivering 466.8 N of pull force at 0.5 MPa, this round-body stainless-steel mini cylinder is built for demanding tensioning and retraction tasks. It is a single-acting PULL type: compressed air retracts the rod via the 1/4" port, while an internal spring extends it. The rod remains extended at rest, providing a fail-safe forward position if air pressure drops. With a practical safe working load of roughly 280 N, it can vertically pull or hold about 23.8 kg with a 2:1 safety margin.
The 125 mm stroke on this Ø40 bore exceeds the 80 mm standard limit for single-acting spring-return units, making it a non-standard, made-to-order configuration. It features a U-style 90-degree rear cover for versatile mounting orientation. This SKU lacks a magnet and cannot accept position sensors; choosing the -S variant enables CMSG, DMSG, or EMSG switches. Fixed TPU bumper pads soften the stroke ends, though they do not lock the load mid-stroke.
Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U Technical Specifications
| Model | Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U |
|---|---|
| Series | MTI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Single acting, pull (spring return) |
| Port size | 1/4" |
| 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 TPU bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MI/MIC (ISO 6432) datasheet. Barrel & rod: stainless steel (round-body, riveted construction). Thread options: PT (blank) / G. Note: the Ø40 bore is a larger, non-ISO-6432 size.
Theoretical Output Force (Ø40mm)
| Pressure | Pull force (spring return) |
|---|---|
| 0.5 MPa | 466.8 N |
| 0.7 MPa | 677.9 N |
Single-acting pull: the spring extends the rod; air retracts it. Forces already net the spring; minimum working pressure is 0.2 MPa.
Model Code: Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U
| MTI | round-body mini cylinder (single-acting pull, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MI-family variants: MI / MIC (double acting ±cushion), MSI / MTI (single acting push / pull), MID / MICD (double rod ±cushion), MIJ / MICJ (adjustable stroke ±cushion). Back covers CA / U / R / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U Is Used
Heavy Gate Retraction
Holds a 23.8 kg security gate closed with a 2:1 margin. The spring keeps the gate extended into the locked path during an air loss event.
Tensioning Assembly
Pulls with 466.8 N at 0.5 MPa to draw components together. The fail-safe extend function maintains tension on the line at rest.
Spring-Loaded Hold-Down
Keeps a 280 N safe working load engaged against a workpiece. Air retracts the pin to release, while the spring ensures it stays locked normally.
Is the Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U the Right Cylinder?
Size strictly by pull force. This Ø40 bore yields 466.8 N at 0.5 MPa and 677.9 N at 0.7 MPa. If your application requires less force, the next size down is Ø32, which provides 295.6 N at 0.5 MPa. Because this is the largest bore available, no larger standard option exists. You must supply at least 0.2 MPa of air to overcome the return spring and retract the rod. Note that the 125 mm travel is non-standard due to spring limitations and requires a made-to-order build. Select LB, FA, SDB, or TC mountings to fit your frame.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.2 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Do not dismantle the riveted front/back covers.
- check Use correct back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MTI Single Acting Stainless Steel Mini Cylinder MTI40X125U FAQ
It is single-acting pull, producing 466.8 N at 0.5 MPa and 677.9 N at 0.7 MPa. It requires at least 0.2 MPa to overcome the spring. The rod is normally extended at rest and retracts only when air is applied.
No, this specific SKU does not have a magnet and cannot accept CMSG, DMSG, or EMSG sensors. You must select the -S variant for position sensing. It is also a non-standard 125 mm stroke, made to order.
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