Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-50S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-50S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm bore and 120mm 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.
- BoreØ20 mm
- Stroke120 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- 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 MACJ20X120-50S
Need a wide on-site trim range? The -50 version of this bore 20 MACJ lets you shorten the 120 mm extend stroke by up to 50 mm with the external stop screw, while the variable air cushion at each end soaks up end-of-travel shock. Double-acting throughout, it delivers 157 N push and 131.9 N pull at 0.5 MPa.
Sizing rule of thumb: budget near 94 N of real push at 0.5 MPa, which translates to hoisting roughly 8 kg vertically on a 2:1 margin. The rolled stainless barrel and 8 mm chrome-plated rod take splashing and humidity that would rust painted mini bodies. Where the stroke never changes, the fixed-stroke MAC with cushion is the simpler sibling; MACJ suits lines that get re-tooled.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-50S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-50S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 120 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 300 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MACJ20X120-50S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -50 | 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 MACJ20X120-50S Is Used
Tray seal hold-down
Clamping lids during a tray-sealing dwell; the 50 mm window absorbs tray height variation between SKUs without changing the cylinder.
Station-to-station gate
A stop gate on a twin-station assembly bench releases one housing at a time; cushions keep the 800 mm/s top speed from hammering the gate.
Cabinet glue clamps
Pressing edge banding onto MDF cabinet doors; the mechanical stop sets clamp depth once and holds it through hundreds of panels.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-50S the Right Cylinder?
Between the 100.5 N of bore 16 and the 245.3 N of bore 25, this 20 mm bore with 157 N at 0.5 MPa fits light clamping and diverting. The 50 mm adjuster sets the extend end position mechanically; it will not hold a load if air pressure drops, so use a locking valve where that matters. Choose FA flange or LB foot mounting, I or Y knuckles on the rod, and G or NPT threads as alternatives to PT. Speed range is 30-800 mm/s.
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 MACJ20X120-50S FAQ
Rated forces: 157 N push and 131.9 N pull at 0.5 MPa; 219.8 N push and 184.7 N pull at 0.7 MPa; 32 kgf theoretical maximum at 1.0 MPa. Pressure envelope is 0.15-1.0 MPa (22-145 psi), proof tested to 1.5 MPa (215 psi).
No. Every MACJ ships with the piston magnet already installed, so CMSG, DMSG or EMSG switches mount straight onto the barrel for end-of-stroke signals. The variable cushion at both ends also lets you run toward the 800 mm/s top speed without metal-to-metal stops.
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 MACJ20X120-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.