Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-20S 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 MACJ20X120-20S
A compact pusher for 120 mm travels: this bore 20 MACJ runs double-acting with an adjustable extend stroke that you can shorten up to 20 mm on site via the built-in stop screw, plus a variable air cushion at both ends. At 0.5 MPa it pushes 157 N and pulls 131.9 N, rising to 219.8 N push at 0.7 MPa, over a 0.15-1.0 MPa (22-145 psi) working band.
The riveted stainless round barrel and hard-chrome plated 8 mm rod tolerate washdown and damp shop air, a real edge over painted-steel minis in food or outdoor cells. For sizing, treat about 94 N as the practical working force at 0.5 MPa, enough to lift around 8 kg vertically with a 2:1 margin. A magnet comes standard, so CMSG, DMSG or EMSG switches clip straight on.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-20S |
|---|---|
| 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 MACJ20X120-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×120 | 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 MACJ20X120-20S Is Used
Molded cap ejection
A 4-cavity benchtop mold ejects finished caps each cycle; 157 N at 0.5 MPa clears the cavity while the 20 mm trim window dials push length to mold depth.
Carton divert pusher
Diverting snack cartons off a takeaway conveyor at up to 800 mm/s, with the end cushions absorbing the stop so cartons do not tumble.
Fixture stop trimming
On an indexing drill fixture, the stop screw lets operators trim clamp travel by up to 20 mm when fixtures of different part heights are swapped.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X120-20S the Right Cylinder?
Step down to a bore 16 MACJ if 100.5 N at 0.5 MPa covers the job, or up to bore 25 (245.3 N) for heavier pushes; this 20 mm bore sits between. Remember the adjuster is an end stop for the extend stroke, not a mid-stroke lock - on air loss the rod still drifts, so add a locking valve if the load must stay put. Mount with FA flange or LB foot, fit I or Y rod knuckles as needed, and run anywhere from 30 to 800 mm/s. At 120 mm stroke, keep side loads off the 8 mm rod or guide the load externally.
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 MACJ20X120-20S FAQ
At 0.5 MPa it pushes 157 N and pulls 131.9 N; at 0.7 MPa push rises to 219.8 N (pull 184.7 N). The theoretical ceiling at 1.0 MPa is 32 kgf. Working pressure spans 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof rating.
A stainless round barrel is rolled onto aluminium covers around a hard-chrome plated 8 mm carbon-steel rod, so it shrugs off washdown better than painted minis. Air ports are 1/8"; the standard magnet accepts CMSG, DMSG and EMSG switches. FA flange and LB foot mounts are available.
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 MACJ20X120-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.