Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X20-20S
The AirTAC MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X20-20S is a genuine double acting, double rod, adjustable stroke + cushion standard round-body mini air cylinder with a Ø50mm bore and 20mm 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
- Stroke20 mm
- Port size1/4"
- Acting typeDouble acting, double rod, 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 MACJ50X20-20S
Air drives the rod both ways, a variable cushion sits at each end to soak up stop shock, and the external stop screw trims extend travel shorter right on the machine. Filtered air from 0.15-1.0 MPa (22-145 psi) moves it at 30-800 mm/s.
The riveted stainless barrel and 16 mm hard-chrome rod shake off washdown and humidity that rust painted-steel minis. A magnet comes built in as standard, so CMSG, DMSG or EMSG switches clip on with no special-order piston.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X20-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X20-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø50 mm |
| Stroke | 20 mm |
| Acting type | Double acting, double rod, 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 881 N |
| 0.7 MPa | 1234 N |
| Max (@1.0 MPa) | 180 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 MACJ50X20-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 50 | Bore size in mm. |
| ×20 | 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 MACJ50X20-20S Is Used
Bench press head
A 20 mm working stroke pressing bearings into small housings: about 589 N of usable force at 0.5 MPa clears the job without hammering the cover, thanks to the adjustable cushion.
Fixture clamp on a CNC jig
Clamps a 40 kg aluminium blank against a locater. The 20 mm trim window lets the setter dial exact clamp travel per fixture, and the switch magnet signals clamp-made to the PLC.
Carton kick-off cylinder
Kicks rejected cartons off a conveyor lane in a damp bottling hall, where the stainless round body survives constant splash that would pit a painted mini.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X20-20S the Right Cylinder?
If your load sits near 50-60 kg, stay here; if you need more force, jump a size. Note the stop screw is a mechanical end stop that only shortens the extend stroke - it is not a mid-stroke lock, and the rod will drift if air pressure drops. Mount via FA flange or LB foot, add an I or Y rod knuckle for a pivoting load, and keep side forces off the rod.
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 MACJ50X20-20S FAQ
Ports are 1/4 in., the rod is 16 mm with an M14x1.5 male thread, working pressure spans 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s, and the extend stroke is adjustable within a 20 mm window with a variable cushion at each end.
No. Every MA-series cylinder ships with the piston magnet already built in as standard equipment, so CMSG, DMSG or EMSG reed or electronic switches mount straight onto the stainless barrel and read end-of-stroke position out of the box - no special piston, no extra charge.
Authorized Export Seller
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.
Related AirTAC MACJ Cylinders
Request a Quote for Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X20-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.