Airtac MI25~40 Stainless Steel Mini Cylinder MI40X45SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X45SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 45mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke45 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 MI40X45SU
Delivering 628.3 N of push force at 0.5 MPa, the AirTAC MI40X45SU is a robust double-acting round-body mini cylinder built for demanding automation. Its stainless-steel barrel and piston rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel or aluminium bodies degrade. The compact 45 mm stroke strikes an excellent balance for short, heavy transfers, while the integrated piston magnet (-S) allows seamless fitment of CMSG, DMSG or EMSG electronic switches for position confirmation.
Because this 40 mm bore exceeds the ISO 6432 standard envelope, it functions purely as a heavy-duty round-body mini cylinder rather than a standard interchange unit. The internal fixed TPU bumper pads absorb the end-of-stroke impact to protect your mechanics, decelerating the load smoothly without the tuning hassle of an adjustable air cushion. For practical sizing, plan for a safe working load of roughly 377 N at 0.5 MPa, which translates to lifting about 32 kg vertically with a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X45SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X45SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 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 MI40X45SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 MI40X45SU Is Used
Heavy-Duty Parts Clamping
Generates 628.3 N of clamping thrust at 0.5 MPa to secure heavy steel castings during CNC machining operations.
Short-Stroke Pressing
Applies up to 879.6 N of push force at 0.7 MPa for seating bearings or pins over a tight 45 mm travel distance.
Diverting Heavy Packages
Handles robust diverting arms on packaging lines, easily moving dense cartons with its 32 kg equivalent lift capacity.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X45SU the Right Cylinder?
Choosing this 45 mm stroke unit means sizing against its neighbours: the Ø32 bore offers 402.2 N push at 0.5 MPa, whereas this Ø40 provides 628.3 N, and there is no larger standard MI frame above it. The U-style back cover provides a 90-degree port and pivot orientation, expanding your mounting flexibility alongside standard LB foot, FA flange, SDB pivot and TC trunnion brackets. If your mechanism loses air supply or the directional valve centres, this cylinder will drift and cannot hold a load in place—the TPU pads only soften the stroke end, so you must add an external rod lock or pilot-operated check valve for secure vertical holding.
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 MI40X45SU FAQ
This double-acting cylinder uses a 1/4" air port and a Ø16 mm rod with an M12x1.25 male thread. It delivers 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.
Yes, the -S suffix indicates a built-in piston magnet compatible with CMSG, DMSG and EMSG reed or electronic switches. The U back cover provides a 90-degree orientation for pivot mounting or port routing, and the stainless-steel riveted round body ensures reliable performance in washdown zones.
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.
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