Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X250-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X250-40S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø25mm bore and 250mm 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
- Stroke250 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 MACJ25X250-40S
Within the MA series of riveted round-body minis, the MACJ25X250-40S combines a 250 mm stroke with a 40 mm window for trimming the extend stroke after installation. It runs double-acting with a variable air cushion at each end, damping arrivals even at the top of the 30-800 mm/s speed band. At 0.5 MPa the 25 mm bore generates 245.3 N on extend and 206.1 N on retract.
Its stainless barrel rolled onto aluminium covers resists washdown corrosion far better than painted minis - a real edge in damp food and outdoor settings. For realistic planning, allow about 147 N of usable push at 0.5 MPa, which corresponds to roughly 12 kg of vertical lift with a 2:1 margin. The magnet is built in as standard, so CMSG, DMSG and EMSG switches drop straight on, and supply pressure spans 0.15-1.0 MPa (22-145 psi), proof tested to 1.5 MPa (215 psi).
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X250-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X250-40S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 250 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 MACJ25X250-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×250 | 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 MACJ25X250-40S Is Used
Carton push-off at a case packer
Sweeping 5 kg cartons off a conveyor end stop into a lane: the 245.3 N thrust clears the load easily, while the 40 mm trim dials the sweep distance to the lane width.
Bottle lane gating on a filler infeed
Extending across the infeed to stop a bank of bottles: 250 mm covers the lane span, and the dual variable air cushion keeps the gate from slamming even at 800 mm/s.
Slide indexing on a small assembly bench
Driving a 250 mm indexing slide between two fixture nests: the ~147 N working load moves the pallet, and CMSG switches on the standard magnet confirm each nest.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X250-40S the Right Cylinder?
Compare before you commit: a bore 20 MA manages 157.0 N of push at 0.5 MPa and a bore 32 reaches 402.2 N, which places this 25 mm unit in the middle at 245.3 N. Over a 250 mm extension the rod has real leverage for bending, so guide side loads externally or fit a Y knuckle where the linkage pivots.
FA flange and LB foot mounts are supported, and the built-in magnet pairs with CMSG / DMSG / EMSG switches without any special order. Treat the 40 mm adjuster as a stroke-limiting stop only - it will not pin the piston if supply air is cut.
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 MACJ25X250-40S FAQ
At 0.5 MPa the cylinder pushes 245.3 N and pulls 206.1 N; at 0.7 MPa that becomes 343.4 N push and 288.5 N pull. The theoretical peak is 50.0 kgf at 1.0 MPa. The port is 1/8", the rod is 10 mm with an M10x1.25 male thread, and the extend stroke trims within a 40 mm window.
No. Every MA-series cylinder leaves the factory with a magnet in the piston, so CMSG, DMSG or EMSG switches clip onto the barrel whenever you need end-of-stroke or intermediate signals - no special-order piston, no retrofit.
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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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