Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø25mm 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.
- BoreØ25 mm
- Stroke40 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM10×1.25
- CushionVariable air cushion, both ends
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S
With a 40 mm stroke you can shave by up to 20 mm using the built-in stop screw, the MACJ25X40-20S tunes itself to the fixture instead of the other way round. Air drives the rod both ways (double-acting) and variable cushions at each end kill the end-of-stroke bang. The riveted stainless barrel and hard-chrome plated rod are at home in wet or dusty plants.
On the 25 mm bore expect 245.3 N out and 206.1 N back at 0.5 MPa, rising to 343.4 N at 0.7 MPa (50 kgf theoretical ceiling). For vertical duties the rod hoists roughly 25 kg at 0.5 MPa; keep payloads near 12.5 kg to hold a 2:1 margin. Position feedback is plug-and-play because the magnet comes standard and pairs with CMSG, DMSG or EMSG switches.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 300 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| -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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S Is Used
Bottling neck-guide setting
On a bottling line, guides for different bottle diameters are re-set by trimming the extend stroke up to 20 mm - no shimming, no cylinder swaps between formats.
Tote pusher on a sortation lane
Nudges totes off a main conveyor into a pick lane; mid-band 25 mm force moves light loads while the cushions keep the push quiet right up to 800 mm/s.
Water-lab sampler actuator
Dips a sampling probe into test beakers at a municipal water lab; the stainless barrel tolerates constant splashes and the trim screw sets dip depth precisely.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S the Right Cylinder?
Sizing check: the bore 20 MAJ pushes 157.0 N and the bore 32 MACJ reaches 402.2 N at 0.5 MPa, so the 25 mm class sits mid-band for clamping and lifting duties. Note the adjuster is only an extend-end stop - if air fails the load can still move, so use a separate valve where holding matters. Fit FA flange or LB foot, pick I or Y knuckles where tooling needs a swivel, and spec PT, G or NPT on the 1/8" ports.
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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-20S FAQ
Bore 25 gives 245.3 N push and 206.1 N pull at 0.5 MPa, 343.4 N push and 288.5 N pull at 0.7 MPa, peaking at 50 kgf theoretical at 1.0 MPa. Operating band is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-800 mm/s, with the 40 mm extend stroke trimmable by 20 mm.
A stop screw mechanically limits rod extension anywhere within the ordered 20 mm window, so you set the final position on the machine itself. It shortens the stroke only - it cannot extend travel past 40 mm - and it is a positioning stop, not a load lock, when air pressure is lost.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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