Airtac MARU Stainless Steel Mini Cylinder MARU20X85S
The AirTAC Airtac MARU Stainless Steel Mini Cylinder MARU20X85S is a genuine double acting + cushion (up mount) standard round-body mini air cylinder with a Ø20mm bore and 85mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service. A variable air cushion at both ends lets you tune end-of-stroke deceleration on site.
- BoreØ20 mm
- Stroke85 mm
- Port size1/8"
- Acting typeDouble acting + cushion (up mount)
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MARU Stainless Steel Mini Cylinder MARU20X85S
An 85 mm stroke on the smallest MAR bore is what the MARU20X85S delivers: a riveted, round-body mini cylinder in stainless steel with double-acting air power and adjustable cushioning at each end. Its top (U) mount is built into the front cover itself, so there is no loose flange to order or align. Because the magnet comes fitted as standard, a CMSG, DMSG or EMSG switch simply clips on.
Expect 157 N of push and 132 N of pull at 0.5 MPa, climbing to 220 N at 0.7 MPa, with 32 kgf as the 1.0 MPa theoretical limit. In everyday terms that 157 N is about 16 kg of push; halve it for a 2:1 margin and the cylinder comfortably lifts around 8 kg vertically. The hard-chrome plated rod and stainless tube take splash, humidity and outdoor duty in their stride across 0.15-1.0 MPa (22-145 psi).
Airtac MARU Stainless Steel Mini Cylinder MARU20X85S Technical Specifications
| Model | Airtac MARU Stainless Steel Mini Cylinder MARU20X85S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 85 mm |
| Acting type | Double acting + cushion (up mount) |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 | Variable air cushion, both ends |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MA-series datasheet. Barrel: stainless-steel tube (round-body, riveted rolling-packed construction); piston rod: carbon steel with 20µm hard-chrome plating; covers: aluminium alloy. Thread options: PT (blank) / G / NPT. Every MA-series cylinder ships with a built-in magnet for CMSG / DMSG / EMSG position sensors.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MARU Stainless Steel Mini Cylinder MARU20X85S
| MAR | Standard round-body mini cylinder (double-acting, integrated mount, variable cushion). |
|---|---|
| U | Front-cover mount: U = up (top) mounting. |
| 20 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| -S | Built-in magnet for CMSG / DMSG / EMSG sensors (standard on MA series). |
MA-family variants: MA / MAC (double acting ±cushion), MSA / MTA (single acting push / pull), MAD / MACD (double rod ±cushion), MAJ / MACJ (adjustable stroke ±cushion), MAR (cushioned with integrated F/U mount). Mounting accessories: FA flange, LB foot, SDB pivot; plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MARU Stainless Steel Mini Cylinder MARU20X85S Is Used
Reject arm
Swings reject items off a tablet-counting line; the 85 mm stroke sweeps the full lane and the cushion lands the arm quietly even at 800 mm/s.
Glue-head press
Presses a glue nozzle onto small wooden frames, where roughly 8 kg of vertical push matches the light bead pressure the joint needs.
Index stop adjust
Positions an adjustable stop on a slat conveyor so changeover between pack sizes becomes a screw turn instead of a rebuild.
Is the Airtac MARU Stainless Steel Mini Cylinder MARU20X85S the Right Cylinder?
If 157 N at 0.5 MPa feels tight for the load, the next bore up, 25 mm, lifts the push to 245 N without changing the 1/8" port size. Note that the MAR holds nothing when air drops: the piston coasts freely, so a rod lock is the answer for held positions. Loads pushed off-axis over this 85 mm stroke should be guided externally; the 8 mm rod is tough but not a side-load bearing.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) is standard for sensors
- ✓ Back cover (CA/U/CM) & mount (FA/LB/SDB)
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 On first run, back off the cushion screws and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MARU Stainless Steel Mini Cylinder MARU20X85S FAQ
At 0.5 MPa it pushes 157 N and pulls 132 N; at 0.7 MPa push is 220 N and pull 185 N; the theoretical maximum is 32 kgf at 1.0 MPa. The 8 mm rod ends in M8x1.25 male thread, air ports are 1/8", and the pressure range is 0.15-1.0 MPa (22-145 psi).
The barrel is high-precision stainless steel riveted to aluminium-alloy covers, and the 8 mm carbon-steel rod is hard-chrome plated to about 20 um. That combination resists rust and mild washdown far better than painted-steel minis, which matters in food, outdoor and humid plants.
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