Airtac MAC Stainless Steel Mini Air Cylinder MAC40X25SUH
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC40X25SUH is a genuine double acting + cushion standard round-body mini air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke25 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 MAC40X25SUH
A 25 mm stroke on a bore 40 body gives you a hard-hitting, short-throw pusher: 628 N forward and 527.8 N back at 0.5 MPa, up to 879.6 N at 0.7 MPa, with 128.1 kgf as the theoretical limit. Short strokes like this are typical for clamps and ejectors, and the riveted stainless barrel keeps corrosion out of the picture in damp workshops.
The variable air cushion at each end still has room to work over 25 mm, taking the sting out of full-speed stops. A magnet rides in the piston as standard, so CMSG, DMSG or EMSG switches bolt on for jaw-open and jaw-closed signals. Worked back to a usable figure, the bore delivers about 377 N of push at 0.5 MPa - call it a 32 kg vertical lift with headroom.
Airtac MAC Stainless Steel Mini Air Cylinder MAC40X25SUH Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC40X25SUH |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 MAC40X25SUH
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 40 | 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 MAC40X25SUH Is Used
Pneumatic vise jaws on CNC benchwork
Swings a 25 mm clamp arm onto aluminium blanks, where the 628 N grip holds parts firm for second-operation drilling.
Ejector on a small stamping die
Kicks finished washers out of a die pocket at end of stroke, with the cushion damping the snap-back on retract.
Indexed fixture confirmation
Confirms a part is fully seated in a rotary-index assembly fixture, using a CMSG switch to signal the 25 mm clamp is home.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC40X25SUH the Right Cylinder?
Compare first: a bore 32 MAC pushes 402 N at 0.5 MPa and a bore 50 pushes 981 N, so 628 N from this bore 40 lands squarely between the two for clamping work. With 25 mm of travel there is little leverage arm, so side loading is rarely a problem, but check the 25 mm covers your jaw travel before ordering. When the valve centres or air drops the piston moves freely - nothing in this design grips by itself - so fit a rod lock or pilot check valve whenever the jaw must stay closed with power off. Mount through the U flat-end back cover or add the FA flange, LB foot or SDB pivot options; the magnet is on every unit.
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 MAC40X25SUH FAQ
Push 628.3 N and pull 527.8 N at 0.5 MPa; push 879.6 N and pull 738.9 N at 0.7 MPa; theoretical maximum 128.1 kgf at 1.0 MPa. Air supply is 0.15-1.0 MPa (22-145 psi) filtered to 40 um, proof pressure 1.5 MPa (215 psi), rod speed 30-800 mm/s, port 1/8", rod thread M12x1.25.
Even over 25 mm the variable air cushion at both ends absorbs the peak deceleration when the rod stops a fast-moving jaw or ejector, protecting the aluminium covers through 30-800 mm/s cycling. Back the needle screws off for first start-up, then close them gradually until the stop feels clean but not harsh.
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