Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X225-20S
The AirTAC MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X225-20S is a genuine double acting, double rod, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 225mm 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
- Stroke225 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 MACJ40X225-20S
Double-acting throughout, with a variable air cushion at each end to kill end-of-stroke shock at speeds up to 800 mm/s.
The riveted round body - stainless tube, hard-chrome carbon-steel rod, aluminium covers - keeps its seals reliable in damp or dusty plants where painted housings flake. It runs on 0.15-1.0 MPa (22-145 psi) filtered air. Note that the 20 mm stop screw only shortens the extend stroke; it is not a brake, and the piston can settle if supply air drops. The magnet comes standard, so CMSG, DMSG or EMSG switches drop straight on.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X225-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X225-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 MACJ40X225-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 MACJ40X225-20S Is Used
CNC fixture clamp
Clamps aluminium billets against hardened stops on a vertical mill; the 20 mm window absorbs billet-height variation between batches, and 628 N at 0.5 MPa holds parts without crushing.
Vision-inspection reject kicker
Ejects out-of-spec parts from an inspection bench on the camera's signal; the standard magnet confirms retraction so the next part is never double-fed.
Powder hopper slide gate
Opens and closes a slide gate on a spice-blending hopper; the variable cushion stops the gate slamming at cycle rates up to 800 mm/s, protecting the gate track from wear.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X225-20S the Right Cylinder?
Step up from the 32 mm bore (402 N at 0.5 MPa) when force runs short, or step down from the 50 mm bore (981 N) when 40 mm is more than the job needs and space is tight. The 20 mm trim range covers most fixture setup changes without re-plumbing the circuit. Choose the FA flange for face mounting or the LB foot for base mounting, with I or Y knuckles where the rod pivots. Keep the 16 mm rod square to the load across the full 225 mm stroke to limit bending stress.
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 MACJ40X225-20S FAQ
Theoretical maximum is 128.1 kgf at 1.0 MPa. Working pressure spans 0.15-1.0 MPa (22-145 psi) with proof at 1.5 MPa (215 psi), speed range is 30-800 mm/s, temperature -20 to +70 C, and the extend stroke is adjustable within the 20 mm window. Port is 1/8", rod thread M12x1.25.
That lets you run the 225 mm stroke faster or carry heavier tooling without the noise and cover wear of an uncushioned mini cylinder. Cushions work on both strokes; the 20 mm adjuster only sets where the extend stroke ends.
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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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