Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X40-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X40-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø50mm bore and 40mm stroke, 1/4" 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.
- BoreØ50 mm
- Stroke40 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- 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 MACJ50X40-20S
Short travel, strong grip: the MACJ50X40-20S packs a 40 mm stroke into a Dia 50 stainless round body and lets you trim the extend stroke by up to 20 mm with the built-in stop screw. Double-acting and cushioned at both ends of travel, it pushes 981 N at 0.5 MPa - ample muscle for clamping jigs and divert kickers.
The rolled stainless tube and chrome-plated rod stand up to washdown chemicals, which is why this bore suits food and packaging machines where painted minis corrode. Size continuous work at about 589 N rather than the full 981 N and you keep margin for pressure sag. The magnet built into every MA piston drives CMSG / DMSG / EMSG switches for end-of-stroke detection at no extra configuration.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X40-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X40-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø50 mm |
| Stroke | 40 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 881 N |
| 0.7 MPa | 1374 N | 1234 N |
| Max (@1.0 MPa) | 200 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 MACJ50X40-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 (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 MACJ50X40-20S Is Used
CNC fixture hold-down clamp
Clamps aluminium plates against a machining jig; the 20 mm window lets one cylinder serve several fixture heights.
Carton diverter on a sortation lane
Swings boxes into a chute at 0.5 MPa, delivering 981 N over the 40 mm throw at sorting speed.
Die ejection pin
Kicks finished parts out of a stamping die nest; the end cushions avoid metal-on-metal shock at high cycle counts.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X40-20S the Right Cylinder?
A MACJ40 with 628 N push at 0.5 MPa is the lighter step down; a MACJ63 with 1558 N is the step up when the 40 mm throw must stake or shear. FA flange and LB foot mount the body; I and Y knuckles suit pivoting levers. Remember the stop screw sets the extend position only - it will not hold a load if air pressure drops, so add a check valve where that matters.
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 MACJ50X40-20S FAQ
It pushes 981 N and pulls 881 N at 0.5 MPa; at 0.7 MPa those rise to 1374 N push and 1233 N pull, with a 200 kgf theoretical ceiling at 1.0 MPa. It runs on filtered air at 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s, through 1/4" PT ports (G and NPT optional).
No. Every unit ships with the magnet already fitted, so CMSG, DMSG or EMSG switches clamp straight on for end-of-stroke signalling without a special-order piston. The stainless barrel shrugs off washdown, and the 16 mm hard-chrome rod keeps wear low even on millions of cycles.
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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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