Airtac MAC Stainless Steel Mini Air Cylinder MAC20X40SU
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC20X40SU is a genuine double acting + cushion standard round-body mini air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 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 MAC20X40SU
Rolled from a high-precision stainless tube with aluminium-alloy covers, the MAC20X40SU carries a flat U-type back cover that sits flush against a machine wall. It is double acting with an adjustable air cushion at each end, delivering 157 N push and 131.9 N pull at 0.5 MPa, or 219.8 N at 0.7 MPa.
Because the rear face is flat, the body bolts flat to a plate with no pivot hardware in the way. The 20 um hard-chrome layer on the rod shrugs off scuffing and light corrosion in humid corners. Apply the 2:1 rule and it lifts about 8 kg vertically - a filled jar or a small tooling block - while the cushion needle screws absorb the final millimetres of travel instead of hammering the covers.
Airtac MAC Stainless Steel Mini Air Cylinder MAC20X40SU Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC20X40SU |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 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 MAC20X40SU
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 MAC20X40SU Is Used
Bench press assist
Adds 157 N of push to a manual bench press for seating bushings into small housings without a full power press.
Wire guide tensioner
Keeps light, steady tension on a wire guide in cable-processing equipment, pulling back with 131.9 N at 0.5 MPa on the return stroke.
Tray stack ejector
Ejects finished trays 40 mm from a magazine in an electronics assembly cell, EMSG switches timing the robot's next pick.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC20X40SU the Right Cylinder?
Compare before committing to 20 mm bore: 100.5 N from the 16 mm MAC, 157 N here, 245.3 N from the 25 mm MAC at 0.5 MPa. The U flat-end fixes the cylinder body, so if the joint must swing pick the CA or CM variant instead; FA flange and LB foot brackets otherwise cover static mounts. Centring the valve lets the rod drift under load, so a rod lock is worth adding where position matters. Ports are 1/8" on this bore and rod thread is M8x1.25.
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 MAC20X40SU FAQ
Push 157 N and pull 131.9 N at 0.5 MPa; push 219.8 N and pull 184.7 N at 0.7 MPa; 32 kgf theoretical maximum at 1.0 MPa. Operating pressure 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s, port 1/8".
Back both cushion needle screws fully off before the first strokes, then open them gradually until the load lands softly at each end. Tune them for the speed you run anywhere in the 30-800 mm/s range - heavier or faster cycles need less restriction.
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