Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X50-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X50-40S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 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 MACJ40X50-40S
The MACJ40X50-40S pairs a 40 mm bore with a 50 mm base stroke and a 40 mm trim window, so the extend stroke can be set anywhere from 50 mm down to 10 mm on site. It is double-acting with a variable air cushion at both ends, running on filtered air at 0.15-1.0 MPa (22-145 psi) and 30-800 mm/s. At 0.5 MPa the bore delivers 628 N of push, which leaves roughly 377 N of dependable working force once you hold a 60 percent margin.
Its stainless round barrel is riveted to the aluminium covers around a hard-chrome plated 16 mm rod, a build that shrugs off washdown and damp shop air far better than painted-steel minis. The magnet comes standard, so CMSG, DMSG or EMSG switches clip on without a special piston. For lifting sums: 628 N supports about 64 kg vertically, so with a 2:1 margin plan on roughly 32 kg of real load.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X50-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X50-40S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MACJ40X50-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MACJ40X50-40S Is Used
Carton tray eject
A pusher on a carton sealing line needs about 350 N to eject formed trays; the 377 N working margin from this bore clears it at 0.5 MPa, with the 40 mm window tuned to the tray pitch.
Pick station verify
Fitted with a DMSG switch, the rod confirms part seating on an assembly pick station; the magnet is standard equipment, so no special-order piston is needed.
Small press clamp
Clamping jigs on a bench press take around 370 N of holding force - the 628 N rating at 0.5 MPa covers it with headroom, cushioned for quiet release.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X50-40S the Right Cylinder?
Size check: the 32 mm bore next size down manages 402 N push at 0.5 MPa, while a 50 mm bore jumps to 981 N - this 40 mm bore at 628 N sits between them for medium pushers and clamps. If the load must stay put on air failure, remember the adjuster is a travel stop, not a holding brake; fit a check or locking valve separately. Choose FA flange or LB foot mounting, I or Y rod knuckles where the load hinges, and let the standard magnet carry CMSG or DMSG sensing.
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 MACJ40X50-40S FAQ
At 0.5 MPa it pushes 628 N and pulls 528 N; at 0.7 MPa those figures rise to 880 N extend and 739 N retract. The theoretical ceiling at 1.0 MPa (145 psi) is 128 kgf. Air must be filtered to 40 um.
The -40 in the code is the trim window: a stop screw shortens the extend stroke anywhere within 40 mm of the 50 mm base stroke. It is a mechanical end stop, not a mid-stroke lock - if air is lost the piston can still be moved, and both ends keep a variable air cushion to soften landings.
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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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