Airtac MI25~40 Stainless Steel Mini Cylinder MI40X85SCM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X85SCM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 85mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke85 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 MI40X85SCM
Delivering serious muscle for a compact frame, this double-acting round-body mini cylinder generates 628.3 N of push force and 527.8 N of pull at 0.5 MPa. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown-heavy settings. A 1/4" port feeds the bore, while fixed TPU pads absorb the impact at stroke end. Because the piston magnet is present, you can mount CMSG, DMSG or EMSG switches for position sensing.
For real-world sizing, plan for roughly 377 N of usable work at 0.5 MPa to keep a safe margin. Alternatively, it lifts about 32 kg vertically with a 2:1 safety factor. The CM round end covers the rear, and the riveted rolled construction keeps the unit light despite its 128.1 kgf theoretical maximum at 1.0 MPa.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X85SCM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X85SCM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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 MI40X85SCM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 MI40X85SCM Is Used
Heavy Package Diverter
Pushes heavy cartons weighing up to 32 kg onto a secondary packaging line using the 628.3 N push force generated at 0.5 MPa.
Washdown Gate Actuator
Operates a stainless-steel routing flap in a food processing plant where the corrosion-resistant barrel survives daily high-pressure rinsing.
Pallet Stopper Arm
Deploys an 85 mm stroke to halt loaded pallets on a roller conveyor, relying on the CM round end and TC trunnion mount to absorb the lateral shock.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X85SCM the Right Cylinder?
Sizing this 40 mm bore leaves no larger standard AirTAC MI option, so if 628.3 N at 0.5 MPa is insufficient, you must jump to a different cylinder family entirely. Stepping down, the Ø32 bore provides 402.2 N of push force, serving as the natural fallback if your load is lighter. Since this SKU includes the -S magnet, it is fully ready for CMSG, DMSG or EMSG sensors. The CM back cover dictates the rear mounting orientation, and you can pair the body with LB foot, FA flange, SDB pivot or TC trunnion brackets.
Remember that standard double-acting operation means the rod drifts if air pressure drops or the valve is centred. The TPU pads only soften the end-of-stroke impact rather than locking the load, so fit an external rod lock or pilot check valve if you need to hold a vertical position securely.
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 MI40X85SCM FAQ
This 40 mm bore cylinder uses a 1/4" air port and a Ø16 mm rod with an M12x1.25 male thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
No, the Ø40 bore exceeds the ISO 6432 standard dimensions, so it is simply a round-body mini cylinder and will not fit standard ISO 6432 mounts. Additionally, it uses fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion. The -S suffix means it does have a magnet for CMSG, DMSG or EMSG sensors.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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