Airtac MAC Stainless Steel Mini Air Cylinder MAC20X25SCM
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC20X25SCM is a genuine double acting + cushion standard round-body mini air cylinder with a Ø20mm bore and 25mm 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
- Stroke25 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 MAC20X25SCM
On the MAC20X25SCM the CM round-end back cover provides a machined pivot eye, turning the 20 mm bore into a ready-made swing cylinder for link arms and levers. Double acting throughout, it develops 157.0 N of push and 131.9 N of pull at 0.5 MPa (72.5 psi), inside a 0.15-1.0 MPa (22-145 psi) window with 30-800 mm/s stroke speeds.
The variable air cushion at each end is the quiet workhorse here: open the needle screws gradually on first run and you can push the speed up or carry heavier parts without the covers taking a hammering. Sized honestly, this bore lifts about 8 kg vertically once you halve the 157 N push (roughly 16 kgf) for a 2:1 margin. Add position feedback by simply snapping on a CMSG, DMSG or EMSG switch - the piston magnet is a standard fitting, not an option.
Airtac MAC Stainless Steel Mini Air Cylinder MAC20X25SCM Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC20X25SCM |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 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 MAC20X25SCM
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×25 | 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 MAC20X25SCM Is Used
Dial-table index arm
The round-end CM cover acts as the pivot for a small rotary index finger on an assembly dial, cycling at up to 800 mm/s with cushions set soft.
Bag clamp on a filler
A short 25 mm stroke clamps open pouch mouths on a semi-automatic filler; 131.9 N of pull at 0.5 MPa holds the jaws shut between fills.
Coolant-mist lathe door closer
Beside a manual lathe the stainless rolled body stands up to constant coolant mist, and the variable cushion keeps the steel door from banging.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC20X25SCM the Right Cylinder?
Compare bores on real force: 16 mm gives 100.5 N at 0.5 MPa, this 20 mm bore gives 157.0 N, and 25 mm reaches 245.3 N - pick the smallest that still clears your load with margin. Once the valve is centred the rod is free to drift, so add a check valve where a load must stay clamped. The CM round-end cover gives a built-in pivot eye; switch to CA or U covers, or add FA, LB or SDB mounts, when the frame demands it. Bore 20 takes 1/8" ports; strokes to 500 mm are standard.
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 MAC20X25SCM FAQ
At 0.5 MPa expect 157.0 N on extension and 131.9 N on retraction; at 0.7 MPa that climbs to 219.8 N and 184.7 N, with a 32.0 kgf theoretical maximum at 1.0 MPa. The cylinder accepts 0.15-1.0 MPa (22-145 psi) of clean 40 um filtered air, carries 1/8" ports, and an 8 mm rod with M8x1.25 thread.
Back both cushion needle screws fully off before the first stroke, then close them a turn at a time until the landing is firm but not abrupt. Done this way the variable cushion absorbs end-of-stroke shock at speeds up to 800 mm/s and with loads near the bore's rating, protecting the aluminium-alloy covers. Never treat the cushion as a brake - it slows the last travel only and cannot hold a load against gravity.
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