Airtac MI25~40 Stainless Steel Mini Cylinder MI40X100U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X100U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 100mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke100 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X100U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation where smaller bores stall. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, giving it a real edge over painted-steel units in damp washdown zones. Riveted construction keeps the body compact, while fixed TPU bumper pads absorb the impact at stroke ends to protect your tooling.
Plan for a safe working load of roughly 377 N, which is about 60 percent of the 0.5 MPa rating, to ensure reliable cycling. Alternatively, you can estimate a vertical lift capacity of around 32 kg when applying a 2:1 safety margin to the 527.8 N pull force. This specific SKU features a 90-degree U back cover and a 1/4" port, but ships without a magnet, meaning it cannot host CMSG, DMSG or EMSG sensors without upgrading to an -S variant.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X100U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X100U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 100 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| 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 | 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 | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 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 MI25~40 Stainless Steel Mini Cylinder MI40X100U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 MI25~40 Stainless Steel Mini Cylinder MI40X100U Is Used
Stamping Press Ejection
Uses the 628.3 N push force to knock heavy stamped metal parts out of a die, relying on the stainless rod to resist cutting fluid splash.
Vertical Parts Press
Pushes bearings or pins into housings on an assembly line, safely applying about 377 N of working force without damaging the joint.
Pallet Diverter Gate
Leverages the 90-degree U cover to pivot a heavy diverter arm, smoothly routing loaded pallets at 30-800 mm/s.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X100U the Right Cylinder?
When sizing this 40 mm bore actuator, look down to the Ø32 class if your task needs less than 402.2 N of push at 0.5 MPa, as this MI40X100U provides a massive 628.3 N. Since this is the largest standard round-body mini cylinder in the family, there is no larger bore to step up to—higher force requirements demand a different cylinder series entirely. The 100 mm stroke is well within the 500 mm maximum, keeping rod bending stress low for side-load durability.
Because this is a double-acting air cylinder, the piston will drift if air pressure drops or the valve is centred; the TPU bumpers only decelerate the stroke end and act as neither a lock nor a brake. To suspend a load safely during an emergency stop, integrate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
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 0.15 – 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 MI25~40 Stainless Steel Mini Cylinder MI40X100U FAQ
This 40 mm bore cylinder features a 1/4" air port and an M12x1.25 male rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
No, this specific SKU lacks a piston magnet, so it cannot host CMSG, DMSG or EMSG reed switches. You must select an -S variant for sensing capabilities. It uses fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion.
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