Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S is a genuine double acting, adjustable stroke 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.
- BoreØ20 mm
- Stroke120 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM8×1.25
- CushionFixed anti-impact bumper pads
- 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S
Compact pushing power for tight panels: the AirTAC MAJ20X120-50S pairs a 20 mm bore with 120 mm of travel and a 50 mm extend-stroke trim range. Because the stop screw sits outside the body, operators re-set the stroke with a wrench in minutes, and the riveted round barrel keeps the whole unit slim. It runs double-acting on filtered air at 0.15-1.0 MPa (22-145 psi) between 30-800 mm/s.
Expect 157 N of push and 132 N of pull at 0.5 MPa, climbing to 220 N and 185 N at 0.7 MPa; the theoretical top for this bore is 32 kgf. Halved for a 2:1 margin, that means it lifts about 8 kg vertically - enough to raise small chutes, guards or sensor arms. The fixed bumper pads soften stroke-end impact through deceleration alone; adjustable air cushioning belongs to the MACJ family, not this model.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 120 mm |
| Acting type | Double acting, adjustable stroke |
| 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 | Fixed anti-impact bumper pads |
| 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S Is Used
Carton sealer glue head
The 50 mm window raises and lowers a hot-glue head between two carton sizes; 157 N at 0.5 MPa keeps the head seated against nozzle pressure.
Drill jig depth stop
On a jig drilling aluminium extrusions, the stop screw sets drilling depth across the 50 mm range, and the hard-chrome rod resists chip and coolant attack.
Hopper slide gate
A coffee-packaging hopper gate opens reliably at roughly 94 N of working force, and the stainless round barrel washes down cleanly between batches.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S the Right Cylinder?
Compare before you buy: the 16 mm bore offers 100 N push at 0.5 MPa for lighter gates, while the 25 mm bore steps up to 245 N when the load grows. Since the adjuster is a hard stop rather than a lock, never rely on it to keep a load from falling when the air fails. FA flange and LB foot mountings, plus I and Y rod knuckles, cover most fixture needs, and the built-in magnet means CMSG / DMSG / EMSG switches ship ready to clip on without a special-order piston.
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 Bumper models: keep speed within the rated range.
- check Installation by qualified personnel per AirTAC docs.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-50S FAQ
Supply filtered air between 0.15-1.0 MPa (22-145 psi) with speed held in the 30-800 mm/s band. This 20 mm bore then yields 157 N push and 132 N pull at 0.5 MPa, 220 N push and 185 N pull at 0.7 MPa, and a theoretical maximum of 32 kgf - plan real workloads near 94 N for long service life.
Yes. The barrel is stainless steel and the 8 mm piston rod is hard-chrome plated to about 20 um, so the cylinder resists mild corrosion and rinse-down far better than painted-steel minis. The aluminium covers are riveted and rolled onto the tube for a sealed body, and the standard magnet lets CMSG, DMSG or EMSG switches sense end positions even after washing.
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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