Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X70-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X70-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø50mm bore and 70mm 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
- Stroke70 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 MACJ50X70-20S
A 70 mm base stroke with a 20 mm trim window suits machines where the exact dwell point is tuned on site: the stop screw shortens the extend stroke anywhere inside those 20 mm while the variable cushion settles the load at both ends. At 0.5 MPa the 50 mm bore generates about 981 N of push and 881 N of pull; at 0.7 MPa, 1374 N and 1233 N.
The MA body is a one-piece riveted stack rather than a bolted assembly: stainless barrel, aluminium covers, hard-chrome rod. That build resists corrosion in wet or outdoor cells and holds alignment over millions of cycles. The standard magnet means a CMSG switch can confirm the trimmed extend position right away, and sizing around 589 N at 0.5 MPa - six tenths of rated push - keeps the seals cool.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X70-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X70-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø50 mm |
| Stroke | 70 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 MACJ50X70-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 MACJ50X70-20S Is Used
Lift table on an assembly cell
With a 2:1 margin the bore lifts about 50 kg vertically; the 70 mm stroke raises a light fixture or workpiece tray on a small lift table.
Chip guard on a CNC lathe
The extend stroke is trimmed within the 20 mm window to close the chip guard just short of the chuck, and the cushion keeps the closure quiet.
Index pin pusher on a rotary table
Seating an index pin needs firm, repeatable force; about 981 N at 0.5 MPa seats the pin while the magnet confirms the home position.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X70-20S the Right Cylinder?
Where 981 N at 0.5 MPa is more than the load needs, the MACJ40 offers about 628 N; where it falls short, the MACJ63 pushes about 1558 N. Treat the adjuster as a hard extend-side stop only - under lost air the piston can still coast, so it is no substitute for a locking circuit. Choose FA flange or LB foot mounting, add I or Y knuckles for pivoting loads, and rely on the built-in magnet for CMSG, DMSG or EMSG sensing. Ports are 1/4 inch.
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 MACJ50X70-20S FAQ
Yes: push about 981 N at 0.5 MPa, pull about 881 N at 0.5 MPa, push about 1374 N and pull about 1233 N at 0.7 MPa, and a theoretical maximum of about 200 kgf at 1.0 MPa. Pressure range is 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s, rod 16 mm threaded M14x1.5, ports 1/4 inch, cushion variable at both ends.
FA flange and LB foot brackets bolt the round body into fixtures, while I and Y rod knuckles handle loads that pivot. The adjustable-stroke version omits the SDB and back-cover mounting codes, so plan the bracket layout around the flange or foot position on the barrel.
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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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