Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-30S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-30S 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 MAJ20X120-30S
A double-acting round-body actuator with a tunable extend stroke, the AirTAC MAJ20X120-30S runs a 20 mm bore and 120 mm of travel. An external stop screw shortens the extend stroke anywhere inside a 30 mm window, so one cylinder can serve several product sizes without changing parts. Air operates at 0.15-1.0 MPa (22-145 psi), speed spans 30-800 mm/s, and fixed bumper pads take the sting out of stroke ends.
At 0.5 MPa this bore pushes 157 N and pulls 132 N; at 0.7 MPa it reaches 220 N on the extend side, with a theoretical ceiling of 32 kgf. Kept to about 94 N of real work at 0.5 MPa, the cylinder holds a comfortable margin for long duty. The stainless barrel, hard-chrome 8 mm rod and riveted aluminium covers shrug off damp and washdown air better than painted minis, and the magnet fitted as standard drops a CMSG, DMSG or EMSG switch straight on.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-30S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-30S |
|---|---|
| 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 MAJ20X120-30S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -30 | 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 MAJ20X120-30S Is Used
Bottling reject gate
A 30 mm trim window lets one MAJ20X120-30S kick off bottles of different heights on a filling line, with 157 N of push at 0.5 MPa clearing the lane every cycle.
Feeder indexing stop
On an electronics parts feeder, the stop screw sets the index position per tray size while the fixed bumper pads settle each part quietly at stroke end.
Sample dryer lid clamp
Roughly 94 N of usable force at 0.5 MPa holds lightweight lids on a lab sample dryer, and the stainless barrel tolerates the humid cabinet environment.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-30S the Right Cylinder?
For stepping up, the 25 mm bore of the MAJ family delivers 245 N push at 0.5 MPa; stepping down, the 16 mm bore manages 100 N, so this 20 mm model sits in the middle for light pusher and clamp work. Remember the stop screw limits extend position only - it is not a mid-stroke brake, and the rod will drift if air pressure is lost. Mounting choices are the FA flange or LB foot, with I and Y rod knuckles available, and the 1/8" port and M8x1.25 male rod thread suit standard fittings. At 120 mm of travel, keep side loads low and align the driven part with the rod axis to protect the bushing.
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 MAJ20X120-30S FAQ
At 0.5 MPa it pushes 157 N and pulls 132 N; at 0.7 MPa the figures rise to 220 N push and 185 N pull. The theoretical maximum for this 20 mm bore is 32 kgf at 1.0 MPa. Working at 0.15-1.0 MPa (22-145 psi) and 30-800 mm/s, it is best sized for about 94 N of real work at 0.5 MPa.
An external stop screw limits how far the rod extends, trimming the stroke anywhere within the ordered 30 mm window. It shortens the extend stroke only - it cannot add travel past the built-in 120 mm - and it acts as a mechanical end stop, not a position brake, so the piston can still drift if air is lost. The 1/8" port and M8x1.25 rod thread take standard fittings.
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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