Airtac MAC Stainless Steel Mini Air Cylinder MAC40X125SU
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC40X125SU is a genuine double acting + cushion standard round-body mini air cylinder with a Ø40mm bore and 125mm 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.
- BoreØ40 mm
- Stroke125 mm
- Port size1/8"
- Acting typeDouble acting + cushion
- Rod threadM12×1.25
- CushionVariable air cushion, both ends
About the Airtac MAC Stainless Steel Mini Air Cylinder MAC40X125SU
The MAC40X125SU is AirTAC's round-body mini cylinder in a 40 mm bore with a 125 mm stroke and a U flat-end back cover. It is double acting - air drives the rod both ways - and a variable air cushion at each end soaks up deceleration shock, so you can run the 30-800 mm/s speed band harder without hammering the covers. At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; the riveted stainless barrel with a hard-chrome plated rod handles damp shops and washdown far better than painted-steel minis.
Two practical numbers: keep real work to about 377 N at 0.5 MPa (roughly 60% of the push rating) for long service life, and note the bore can raise about 64 kg vertically on paper - halve that to around 32 kg if you want a 2:1 margin. The magnet is built in as standard, so CMSG, DMSG or EMSG switches clip on without a special piston.
Airtac MAC Stainless Steel Mini Air Cylinder MAC40X125SU Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC40X125SU |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting + cushion |
| Port size | 1/8" |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MAC40X125SU
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MAC40X125SU Is Used
Bench press fixture
Clamps or presses small aluminium housings on an assembly bench; 377 N of usable push at 0.5 MPa is plenty for light staking and seating work.
Packaging pusher
Kicks cartons sideways on a packaging conveyor at up to 800 mm/s, with the variable cushion stopping the stroke without racking the frame.
Guard gate feedback
Opens a machine guard gate and confirms travel via a DMSG switch riding on the standard magnet, keeping the interlock logic simple.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC40X125SU the Right Cylinder?
At 0.5 MPa this 40 mm bore gives 628.3 N of push; if your load needs under 402.2 N, the 32 mm bore MAC saves air, while the 50 mm bore's 981.3 N covers heavier clamping. Remember a plain MAC will drift if air is lost - it has no internal lock - so add a pilot check valve or rod lock for held loads. The U flat-end back cover bolts to fixed plates, and FA flange, LB foot or SDB pivot brackets can be added; strokes beyond 500 mm on this bore are made to order.
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 MAC40X125SU FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa those rise to 879.6 N and 738.9 N, with a theoretical maximum of 128.1 kgf at 1.0 MPa. The 40 mm bore uses a 16 mm rod with M12x1.25 male thread and 1/8" ports, runs on 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s, and works from -20 to +70 C.
Back both needle screws fully off, run the cylinder gently, then close each screw gradually until end-of-stroke impact disappears. The cushion is variable at both ends, so extension and retraction can be tuned separately. Do not treat the cushion as a brake; without air pressure the rod will drift freely.
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