Airtac MAC Stainless Steel Mini Air Cylinder MAC20X55SU
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC20X55SU is a genuine double acting + cushion standard round-body mini air cylinder with a Ø20mm bore and 55mm 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
- Stroke55 mm
- Port size1/8"
- Acting typeDouble acting + cushion
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MAC Stainless Steel Mini Air Cylinder MAC20X55SU
The MAC20X55SU is a double-acting mini cylinder in AirTAC's round-body MA family, with a variable air cushion at both ends and a 55 mm stroke. At 0.5 MPa it pushes 157 N and pulls 131.9 N; at 0.7 MPa that rises to 219.8 N, with a theoretical ceiling of 32 kgf at 1.0 MPa. The flat-end U back cover gives a fixed mounting face with no adaptor bracket.
Keep the working force near 94 N rather than the full 157 N rating and the cylinder keeps its margin over millions of cycles. The stainless barrel and hard-chrome plated rod (20 um) resist washdown and damp shop air far better than painted-steel minis, and because the magnet is standard, CMSG, DMSG or EMSG switches clip straight on.
Airtac MAC Stainless Steel Mini Air Cylinder MAC20X55SU Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC20X55SU |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 55 mm |
| Acting type | Double acting + cushion |
| 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 MAC Stainless Steel Mini Air Cylinder MAC20X55SU
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -S | Built-in magnet for CMSG / DMSG / EMSG sensors (standard on MA series). |
| CA / U / CM | Back-cover type: CA pivot, U flat-end, CM round-end. |
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 MAC Stainless Steel Mini Air Cylinder MAC20X55SU Is Used
Carton gate on a packaging line
A 55 mm stroke swings or pushes small cartons between conveyor lanes; 157 N at 0.5 MPa is ample for gating 1-2 kg items at speed.
Clamp fixture on a CNC jig
Clamps thin workpieces in a drilling jig; about 94 N of usable force holds parts firm without marking soft aluminium.
Sorting chute confirmation
Extends a deflector into a sorting chute; the standard magnet and a DMSG switch confirm full extension before the next part drops.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC20X55SU the Right Cylinder?
At this bore size you could step down to a 16 mm MAC for 100.5 N at 0.5 MPa, or up to a 25 mm bore for 245.3 N if loads creep toward 150 N. Like any double-acting cylinder without a rod lock, the MAC20X55SU will drift if air is cut, so add a pilot check valve or rod lock where a load must stay put. The U flat-end cover suits fixed plates; FA flange, LB foot or SDB pivot add further options, and the 1/8" ports plus M8x1.25 rod thread keep plumbing simple. The built-in magnet is ready for CMSG or DMSG switches at either end.
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 MAC Stainless Steel Mini Air Cylinder MAC20X55SU FAQ
At 0.5 MPa it pushes 157.0 N and pulls 131.9 N; at 0.7 MPa, 219.8 N push and 184.7 N pull, with a theoretical maximum of 32 kgf at 1.0 MPa. It runs on 0.15-1.0 MPa (22-145 psi) filtered air through 1/8" ports, is double acting with a variable air cushion at both ends, covers 30-800 mm/s, and tolerates -20 to +70 C. Proof pressure is 1.5 MPa (215 psi).
The U cover presents a flat, threaded face that bolts directly to machine plates, avoiding the clevis or extra brackets a pivot mount would need. The cushion needle screws sit in the covers, so back them off on first run-up and close them gradually to soften both end stops. The magnet is built in as standard, so an EMSG switch reads position with no special piston.
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1-Year Warranty
Covers non-human-caused product damage.
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