Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-40S 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 MACJ25X40-40S
Round, riveted and ready for damp shops: the MACJ25X40-40S pairs a stainless-steel barrel with a 20 um hard-chrome steel rod, so mild washdown and humid air will not eat the body the way they eat painted minis. It is double-acting with an adjustable extend stroke - the -40 code lets you shorten travel anywhere within a 40 mm window using the stop screw - and a variable air cushion at both ends keeps end-of-stroke shock off the aluminium covers.
At 0.5 MPa this bore pushes 245.3 N and pulls 206.1 N. Keep real workloads near 147 N and the cylinder runs with margin instead of at its ceiling; that is roughly enough to lift a 12 kg fixture vertically with a 2:1 safety factor. Pressure range is 0.15-1.0 MPa (22-145 psi) and speed 30-800 mm/s.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-40S |
|---|---|
| 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 MACJ25X40-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -40 | 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 MACJ25X40-40S Is Used
Small-part ejection on assembly benches
Trims eject travel to 20-30 mm on a jig that only needs a nudge; 245 N at 0.5 MPa clears stuck nylon parts without bending thin brackets.
Carton flap tucker on a semi-auto packer
The 40 mm adjustable window lets operators shorten the tuck stroke for shallow flap folds, while both-end cushioning stops the flap from springing open.
Bench-top press for connector crimp checks
Around 147 N of usable force at 0.5 MPa suits sample crimps and go/no-go tests; the stop screw fixes the bottom position batch after batch.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X40-40S the Right Cylinder?
Size check: bore 20 delivers only 157.0 N push at 0.5 MPa - fine below 90 N of work, but this 25 mm bore earns its place from about 100-145 N. If your part or clamp needs over 240 N of real force, step up to bore 32 (402.2 N at 0.5 MPa). The 40 mm stroke with a full 40 mm trim window means the stop screw covers the entire travel, so you can peg the extend stroke almost anywhere from near zero to 40 mm on site.
Note the adjuster is a mechanical end stop, not a lock: if air drops, the rod can still be pushed back. Mount with the FA flange or LB foot, add I or Y rod knuckles on swivel joints, and every unit ships with the magnet built in for CMSG / DMSG / EMSG switches.
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 MACJ25X40-40S FAQ
Double-acting with adjustable stroke: push 245.3 N and pull 206.1 N at 0.5 MPa, push 343.4 N and pull 288.5 N at 0.7 MPa, and a theoretical 50 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s, bore 25 mm with a 10 mm rod, 1/8" ports and a 40 mm adjustable window.
No - it only limits the extend stroke. On pressure loss the rod can still be back-driven, so add a separate locking solution for suspended loads. What you do get standard is a built-in magnet, so CMSG / DMSG / EMSG switches clip straight on, plus FA flange, LB foot and I / Y knuckle mounting options.
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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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