Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SR
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SR 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 MI40X20SR
Generating 628.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles heavy-duty tasks in tight spaces. The Ø40 bore features a 1/4" air port and a robust Ø16 mm piston rod with an M12x1.25 male thread. Its riveted stainless construction resists mild corrosion and washdown, outperforming painted alternatives in damp environments. Fixed TPU bumper pads absorb stroke-end impact.
For practical sizing, plan for a safe working load of about 377 N, which is roughly 60% of the 0.5 MPa rating. This translates to lifting a 32 kg part vertically with a 2:1 safety margin. Because this SKU includes the -S magnet, it supports CMSG, DMSG, and EMSG reed or electronic switches for position sensing. The R back cover provides an axial-in port orientation for neat plumbing.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SR Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SR |
|---|---|
| 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 MI40X20SR
| 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 MI40X20SR Is Used
Short-Stroke Stamping
Delivers 628.3 N of push at 0.5 MPa to seat rivets or stamp small metal tags in compact progressive die machinery.
Heavy Diverter Gate
Provides the robust force needed to pivot a heavy-duty routing flap on a packaging conveyor handling dense product flows.
Pallet Stopper Block
Acts as a high-strength end-stop for loaded pallets, using its 32 kg vertical lift equivalent to halt movement securely.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SR the Right Cylinder?
When sizing this 40 mm bore, compare it against the adjacent MI32, which yields 402.2 N of push at 0.5 MPa. If the MI32 lacks power, this MI40X20SR steps up to 628.3 N without requiring a larger footprint. Since the MI40 is the largest available bore in this series, moving beyond 128.1 kgf theoretical maximum force requires switching to a different cylinder family. The 20 mm stroke minimizes rod-bending side-load risks, keeping the guide bearings intact.
Note that a standard double-acting cylinder drifts when air is lost or the valve is centered; the TPU bumpers only decelerate the stroke end and do not function as a brake. To suspend a load safely, install an external rod lock or a pilot-operated check valve. Mounting options include LB foot brackets, FA flanges, SDB pivot blocks, and TC trunnions.
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 MI40X20SR FAQ
This double-acting cylinder uses a 1/4" air port. 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.
The -S suffix means it has a built-in piston magnet for CMSG, DMSG, and EMSG switches. However, it features fixed TPU bumper pads for stroke-end deceleration, not an adjustable air cushion; for adjustable cushioning, look at the MIC variant.
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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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