Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20CM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20CM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 20mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke20 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 MI40X20CM
Generating a substantial 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty short-stroke tasks. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, making it superior to painted alternatives in damp washdown environments. It carries a 1/4" port and an M12x1.25 male rod thread.
Equipped with fixed TPU bumper pads to decelerate the stroke end, the compact riveted body features a CM round rear cover for straightforward port and mounting alignment. Because this SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG position switches. For moving real masses, plan for about 377 N of usable work, which safely lifts roughly 32 kg vertically with a 2:1 margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20CM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20CM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 MI40X20CM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MI40X20CM Is Used
Short-Stroke Stamping
Applies the full 879.6 N push at 0.7 MPa for compactly pressing or crimping small metal components within a 20 mm travel.
Heavy Diverter Gate
Leverages the 32 kg safe vertical lift capacity to pivot heavy routing flaps on high-throughput packaging conveyors.
Pallet Stop Block
Uses the robust Ø16 rod and fixed TPU bumpers to abruptly halt loaded pallets, absorbing the impact without internal damage.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20CM the Right Cylinder?
Sizing this 40 mm bore against its neighbours ensures you apply the right thrust without overspending. Dropping to the Ø32 bore lowers the push force to 402.2 N at 0.5 MPa, while the Ø40 is the largest available standard MI size, so upgrading further requires a different cylinder family entirely. The 20 mm stroke keeps the rod short and highly resistant to bending under high side loads.
Remember that venting the air or centering the valve causes the piston to drift, as the TPU bumpers only soften end impacts rather than locking the rod. To suspend a load safely, integrate an external rod lock or a pilot-operated check valve. If your cycle demands adjustable end-cushioning for high speeds, step up to the MIC variable-cushion variant.
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 MI40X20CM FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa. The air port is 1/4" and the male rod thread is M12x1.25.
No, this specific SKU lacks the internal magnet, so CMSG, DMSG, or EMSG switches cannot be used. You would need the -S variant for position sensing. The unit also features a CM round rear cover and fixed TPU bumpers rather than an adjustable air cushion.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20CM
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.