Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S is a genuine double acting, double rod, adjustable stroke + 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, double rod, adjustable stroke + cushion
- Rod threadM12×1.25
- 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 MACJ40X25-20S
With a 20 mm trim range on a 25 mm stroke, the MACJ40X25-20S lets one cylinder cover several gap settings on compact tooling instead of one unit per setting. It is double-acting with a variable cushion at each end, fed with 40 um filtered air at 0.15-1.0 MPa (22-145 psi).
The stainless round barrel and 20 um hard-chrome rod stand up to coolant splash and humid air, and the built-in magnet works with CMSG, DMSG and EMSG switches out of the box.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting, double rod, adjustable stroke + 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 kgf |
MAJ / MACJ are double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 (double rod, 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 MACJ40X25-20S Is Used
Welding jig hold-down
Clamping brackets on an automotive weld fixture: the 20 mm window matches clamp-arm height per part variant, and 628 N at 0.5 MPa keeps pieces seated during spot welding.
Sensor flag on a CNC pallet
Extending a flag into a photoelectric beam to confirm pallet seating: the trimmed stroke sets flag depth precisely, and the cushion keeps the cycle quiet.
Bagging machine fill gate
Metering gates on a small bagging line need a fast, short throw; 25 mm of stroke at up to 800 mm/s cycles quickly while cushioned ends protect the covers.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S the Right Cylinder?
If 628 N is more than the job needs, the 32 mm bore offers 402 N at 0.5 MPa; if less, move to the 50 mm bore and its 981 N. This 40 mm middle class suits clamping and short transfer moves on densely packed machines. At a 25 mm stroke, rod bending is rarely a worry, though an FA flange or LB foot still anchors the unit best; I and Y knuckles fit swinging clamps. The adjuster fixes the extend stop only - it will not hold a load if air is lost. Magnet is standard; sensing needs no option 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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-20S FAQ
Theoretical maximum at 1.0 MPa: 128.1 kgf. The cylinder is double-acting with the extend stroke adjustable within 20 mm of its 25 mm base, a variable cushion at each end, 0.15-1.0 MPa (22-145 psi) operating range and 30-800 mm/s speed.
The barrel is stainless steel rolled into a round body with aluminium covers - no tie rods to work loose - and the carbon-steel rod carries a 20 um hard-chrome plating. That combination resists coolant mist, humidity and mild washdown, keeping the 628 N (0.5 MPa) output available year-round with minimal maintenance.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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