Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke50 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 MACJ20X50-20S
Tuned reach is the whole point of the MACJ20X50-20S: an external stop screw backs the extend stroke off by up to 20 mm, while a rolled stainless tube and riveted aluminium covers keep the 20 mm bore sealed through damp shifts. Running double-acting, it pushes 157 N and pulls 131.9 N at 0.5 MPa, with variable cushions at each end covering the 30-800 mm/s band.
For vertical work the 157 N thrust equals about 16 kgf, so plan on raising roughly 8 kg with a 2:1 margin before friction eats in. Hard-chrome plating on the carbon-steel rod keeps seal wear low in humid air, and the standard-fitted magnet makes CMSG, DMSG or EMSG switches a clip-on rather than an upgrade.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 50 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 MACJ20X50-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 MACJ20X50-20S Is Used
Pallet elevator lock pin
Raises locking pins on a light pallet lift where the 8 kg vertical figure (157 N at 0.5 MPa with a 2:1 margin) still covers the pin stack.
Rotary dial detent
The 20 mm window sets the detent to engage at the exact dial position, and the cushion quiets each engagement on fast cycles.
Tote check on a case conveyor spur
A DMSG switch riding the standard magnet confirms tote seating, while 157 N at 0.5 MPa flips the check arm with ease.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-20S the Right Cylinder?
Compare neighbours honestly: 100.5 N at 0.5 MPa from a 16 mm bore versus 245.3 N from a 25 mm bore sets this size in the middle of the mini family. The 20 mm trim shortens extend only and adds no travel, and as a pure end stop it will not pin a load once air is lost - rest the weight on a mechanical stop instead. FA flange or LB foot mounting, I or Y rod knuckles, 1/8" ports and the as-standard magnet cover the usual plumbing, fixturing and feedback.
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 MACJ20X50-20S FAQ
At 0.5 MPa: 157 N push, 131.9 N pull. At 0.7 MPa: 219.8 N push, 184.7 N pull. Maximum theoretical force is 32 kgf at 1.0 MPa. Ports are 1/8", rod 8 mm, pressure 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-800 mm/s.
The stop screw shortens the extend stroke anywhere inside the 20 mm window, letting you tune reach to the part without reordering; it cannot extend travel past 50 mm. Variable air cushions at both ends absorb the landing, so heavier or faster cycles stay quiet. The adjuster is a stop, not a brake, so a lost-air rod can still drift.
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.
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