Airtac MAC Stainless Steel Mini Air Cylinder MAC20X70SU
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC20X70SU is a genuine double acting + cushion standard round-body mini air cylinder with a Ø20mm bore and 70mm 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
- Stroke70 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 MAC20X70SU
The U flat-end back cover is the defining choice here: MAC20X70SU bolts flat against a machine face with no bracket in the way. Underneath, it is the familiar MA-family round cylinder - stainless barrel, hard-chrome plated rod, riveted aluminium covers - double acting with an adjustable air cushion at each end. Push force at 0.5 MPa is 157 N.
Plan the job around roughly 94 N of working push at 0.5 MPa rather than the raw rating; that corresponds to hoisting an 8 kg part with a 2:1 safety factor. Speed runs from 30-800 mm/s on 0.15-1.0 MPa (22-145 psi) air, and the built-in magnet means a CMSG or EMSG switch slides on for end-of-stroke signalling.
Airtac MAC Stainless Steel Mini Air Cylinder MAC20X70SU Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC20X70SU |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 70 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 MAC20X70SU
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | 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 MAC20X70SU Is Used
Carton hold-down
Presses a flap flat on a case-sealing station; 157 N at 0.5 MPa seats the adhesive without crushing the board.
Fixture ejector
Kicks finished brackets out of a drilling jig on a 70 mm slide; the flat end bolts straight to the jig plate.
Dosing valve linkage on a water treatment skid
Drives the valve linkage outdoors, where the stainless barrel resists rain and spray far better than painted tubes.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC20X70SU the Right Cylinder?
Compare bore 16 (100.5 N at 0.5 MPa) when the load is light, and bore 25 (245.3 N) when clamping force climbs past 90 N. Remember the rod is free to move whenever supply pressure drops - a hanging or spring-biased load will creep, so specify a rod lock or pilot check valve where position matters. The flat-end cover suits direct face mounting; FA flange, LB foot and SDB pivot brackets remain available, and I or Y knuckles finish the rod 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 MAC20X70SU FAQ
Push at 0.5 MPa reaches 157 N with 131.9 N on the return; at 0.7 MPa the figures are 219.8 N push and 184.7 N pull. Theoretical maximum is 32.0 kgf at 1.0 MPa. Ports are 1/8" and the rod thread is M8x1.25 on an 8 mm rod.
Needle screws at each end throttle the exhaust just before the piston lands, letting you bleed the cushion in until heavy-load clatter disappears. Open them fully during commissioning, then trim to the load; running speed is 30-800 mm/s.
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