Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X85SR
The AirTAC Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X85SR is a genuine single acting, push (spring return) round-body mini air cylinder with a Ø20mm bore and 85mm 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
- Stroke85 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 MSI20X85SR
Delivering a net push of 119.5 N at 0.5 MPa, this AirTAC stainless-steel round-body mini cylinder uses compressed air to extend the rod and an internal spring to retract it. Because it is single-acting, you only need one 1/8" air line, saving piping and valve costs while ensuring the rod safely retracts if air pressure drops. The 85 mm stroke on this Ø20 bore exceeds the typical 80 mm single-acting limit, making it a non-standard, made-to-order item to accommodate the longer return spring.
Built with a corrosion-resistant stainless barrel and rod, it handles mild washdown environments and drops directly into standard ISO 6432 mini-cylinder brackets. Factoring a 2:1 safety margin against the 0.5 MPa rating, it provides a safe vertical lift of about 6.1 kg. The -S suffix means a piston magnet is included for position sensing, while fixed TPU bumper pads soften the stroke ends.
Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X85SR Technical Specifications
| Model | Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X85SR |
|---|---|
| Series | MSI ISO 6432 mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 85 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 MSI20X85SR
| MSI | ISO 6432 round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 20 | 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 MSI Single Acting Stainless Steel Mini Cylinder MSI20X85SR Is Used
Light Part Ejection
Uses the 119.5 N push stroke to positively eject small molded parts from a fixture, with the spring ensuring the ejector retracts clear on air loss.
Product Diverting
Acts as a spring-return gate on a low-friction conveyor, pushing light cartons weighing up to 6.1 kg sideways before automatically withdrawing.
Clamping Stops
Extends to clamp or hold a lightweight workpiece in place during machining, safely releasing the part back to the retracted rest position if the air supply fails.
Is the Airtac MSI Single Acting Stainless Steel Mini Cylinder MSI20X85SR 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 your application requires more, the Ø25 bore offers 190.3 N. Remember that at least 0.2 MPa of input pressure is required to overcome the internal return spring before the rod can extend. Because the 85 mm stroke surpasses the standard 80 mm spring travel limit for this size, expect a made-to-order lead time. Mounting options include LB foot, FA flange, SDB pivot-block, and TC trunnion, and the -S magnet allows use of CMSG, DMSG, or EMSG sensors.
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 MSI20X85SR FAQ
This single-acting push cylinder generates 119.5 N of force at 0.5 MPa and 182.3 N at 0.7 MPa. It requires a minimum operating pressure of 0.2 MPa to overcome the internal return spring. Upon air loss, the spring drives the rod back to the fully retracted rest position.
Yes, the -S suffix indicates a built-in piston magnet, allowing you to mount CMSG, DMSG, or EMSG reed or electronic sensors directly to the stainless-steel round body for stroke detection.
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