Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU
The AirTAC Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU is a genuine single acting, push (spring return) round-body mini air cylinder with a Ø20mm bore and 125mm stroke, 1/8" air ports and a stainless-steel barrel and rod for mildly corrosive environments. Its ISO 6432 mounting interface makes it a compact drop-in for standard mini-cylinder fixtures.
- BoreØ20 mm
- Stroke125 mm
- Port size1/8"
- Acting typeSingle acting, push (spring return)
- Rod threadM8×1.25
- CushionFixed TPU bumper pads
About the Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU
Delivering 119.5 N of net push force at 0.5 MPa, this stainless-steel round-body mini cylinder uses compressed air to extend and an internal mechanical spring to retract. The MSI20X125SU is a single-acting push type that requires only one 1/8" air line, saving plumbing and ensuring the rod safely springs back to its retracted rest position if air pressure is lost. Its stainless barrel and rod resist mild corrosion and washdown environments.
Because the 125 mm stroke exceeds the 80 mm spring-limited standard for a Ø20 bore, this specific unit is a non-standard, made-to-order configuration. The built-in piston magnet (-S) supports CMSG, DMSG, and EMSG position switches, while the U back cover provides a 90-degree mounting and port orientation. Fixed TPU bumper pads cushion the stroke ends without locking the load mid-travel. For vertical lifting, expect a safe capacity of about 6.1 kg with a 2:1 margin.
Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU Technical Specifications
| Model | Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU |
|---|---|
| Series | MSI ISO 6432 mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 mm |
| Acting type | Single acting, push (spring return) |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 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.
Theoretical Output Force (Ø20mm)
| Pressure | Push force (spring return) |
|---|---|
| 0.5 MPa | 119.5 N |
| 0.7 MPa | 182.3 N |
Single-acting push: air extends the rod; the return spring retracts it. Forces already net the spring; minimum working pressure is 0.2 MPa.
Model Code: Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU
| MSI | ISO 6432 round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | 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 MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU Is Used
Extended-Reach Part Ejection
Pushes finished parts out of a machining zone over the 125 mm travel, using 119.5 N of force before spring-retracting to clear the workspace.
Long-Stroke Gate Diversion
Acts as a spring-return sorting gate on a conveyor line, extending to divert items and safely retracting when air is removed to restore flow.
Carton Flap Folding
Extends to fold large packaging flaps, applying a safe working load of roughly 72 N, then retracts via the internal spring for the next cycle.
Is the Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU the Right Cylinder?
When sizing by push force, this Ø20 bore yields 119.5 N at 0.5 MPa. If you need less force, the Ø16 bore provides 74.9 N; if you require more, the Ø25 bore offers 190.3 N. You must supply at least 0.2 MPa of air pressure to overcome the internal return spring, or the rod will not extend. Operating speed ranges from 50 to 800 mm/s.
The 125 mm travel length is non-standard for this single-acting spring-return series and must be ordered as a special configuration. It uses the ISO 6432 mini-cylinder mounting interface, compatible with standard brackets and clevises. Choose LB foot, FA flange, SDB pivot-block, or TC trunnion mounts to fit your machine.
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 0.2 – 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 MSI Single Acting Stainless Steel Mini Cylinder MSI20X125SU FAQ
It provides a single-acting push force of 119.5 N at 0.5 MPa and 182.3 N at 0.7 MPa. A minimum operating pressure of 0.2 MPa is required to overcome the internal spring. Upon air loss, the spring drives the rod to the normally retracted rest position.
Yes, the -S suffix indicates a built-in piston magnet, allowing you to mount CMSG, DMSG, or EMSG switches for reed or electronic sensing. A SKU without the S cannot take a sensor.
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