Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-20S 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 MAJ20X120-20S
Stroke 120 mm, trim up to 20 mm: the MAJ20X120-20S fits transfers where the final approach must stop short of full extension. Double-acting air drives it out with 157 N (0.5 MPa) and retracts with 131.9 N, while fixed bumper pads calm both ends of travel at 30-800 mm/s.
Vertically that 157 N equals about 16 kgf theoretical; halve it and the rod lifts roughly 8 kg with a 2:1 margin - a clean match for small castings or loaded trays. Mount on LB feet or an FA flange, clamp a DMSG switch to the magnet-carrying barrel (the magnet ships standard), and take air in through the 1/8" port with PT, G or NPT threads to order.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-20S |
|---|---|
| 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 MAJ20X120-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-20S Is Used
Small casting lift-check
Raises a 4 kg aluminium casting 120 mm on a gauge stand; the bore 20 force equals about 8 kg vertical lift at a 2:1 margin.
Swarf scraper arm
Wipes chips from a machine-tool conveyor; the hard-chrome plated rod stands up to constant coolant splash.
Diaphragm valve actuator
Stroke-trims a pilot linkage by up to 20 mm to match seat wear on a water treatment skid.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X120-20S the Right Cylinder?
Force ladder for the MA family at 0.5 MPa: 100.5 N (bore 16), 157 N (this bore 20), 245.3 N (bore 25). Choose up if your fixture needs more than roughly 94 N of working effort at this stroke; drop to 16 mm if 100 N already covers it and you want a smaller envelope.
The 20 mm trim window suits final-approach tuning on 120 mm transfers. FA flange or LB foot mounting, I/Y rod knuckles, and magnet-standard switching (CMSG / DMSG / EMSG) complete the package. Remember the adjuster is a stroke end-stop, so a suspended load will sag if supply air is cut.
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 MAJ20X120-20S FAQ
Expect 157 N on extension and 131.9 N on retraction at 0.5 MPa; at 0.7 MPa, 219.8 N extend and 184.7 N retract. Theoretical maximum is 32.0 kgf at 1.0 MPa. Operating range is 0.15-1.0 MPa (22-145 psi).
No - MAJ cylinders carry fixed anti-impact bumper pads that decelerate the piston at each end of travel; they are not adjustable air cushions (that function belongs to the MACJ family). Mount the body via FA flange or LB feet and connect tooling with I or Y rod knuckles.
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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.
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Most inquiries answered within 7-8 hours.
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