Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-40S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting, 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 MACJ40X250-40S
With a 40 mm adjustable window, the MACJ40X250-40S lets you trim the extend stroke on site instead of re-ordering a custom length. It is double-acting with a variable air cushion at both ends, running on 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s. At 0.5 MPa the 40 mm bore pushes 628 N and pulls 528 N; at 0.7 MPa push rises to 880 N, peaking at a theoretical 128 kgf.
The riveted stainless round barrel and hard-chrome plated rod shrug off washdown and damp shop air, a real edge over painted mini cylinders in food and outdoor lines. The magnet is built in as standard, so CMSG, DMSG or EMSG switches clip on without a special piston. Plan work around 377 N at 0.5 MPa, roughly 60 percent of the push rating, and the rod lifts about 32 kg vertically once you halve the 64 kgf equivalent for margin.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-40S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting, 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 | 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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | 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 MACJ40X250-40S Is Used
Packaging line pusher
Sorting cartons on a 250 mm pitch: 628 N at 0.5 MPa shoves a full row while the 40 mm window dials the park position back to clear the lane.
Pallet gate actuation
Swinging heavy gates on pallet conveyors, where the cushioned stops let the cylinder run faster without hammering the frame at each cycle.
Assembly press assist
Light press-fit and staking steps on small aluminium housings, with 377 N of usable work at 0.5 MPa covering most insert operations.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-40S the Right Cylinder?
Compare sizes before committing: bore 32 delivers 402 N push at 0.5 MPa and bore 50 reaches 981 N, so this 40 mm barrel sits mid-range at 628 N. The adjuster is a mechanical end stop for the extend side only, not a lock, so the rod will drift if air is lost. Mount with an FA flange or LB foot, add I or Y rod knuckles where the load pivots, and match position sensing to the built-in magnet. With 250 mm of stroke, keep side loads off the 16 mm rod or guide the load externally.
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 MACJ40X250-40S FAQ
At 0.5 MPa it pushes 628 N and pulls 528 N; at 0.7 MPa push reaches 880 N, with a theoretical maximum of 128 kgf. The -40 in the code is the extend-stroke trim window: an external screw shortens the stroke by up to 40 mm from the ordered 250 mm. It is a mechanical stop, not a mid-stroke lock, so the piston still drifts if air pressure is lost. Supply runs 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s.
Neither. The position magnet is fitted to every MA-series piston as standard, so CMSG, DMSG and EMSG switches mount straight on. A variable air cushion works at both ends and you set its depth by screw, absorbing shock across the whole 30-800 mm/s speed range.
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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.
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Most inquiries answered within 7-8 hours.
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