Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X50-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X50-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke50 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM12×1.25
- 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 MAJ40X50-20S
When a fixture needs one bore and several stop points, the 20 mm trim window earns its keep: dial the extend stroke shorter anywhere inside that range with the external stop screw, no re-plumbing, while the 40 mm bore throws 628.3 N of push at 0.5 MPa. Anti-impact bumper pads are fixed into both covers to soften the landing; they decelerate, they do not meter air like an adjustable cushion.
The riveted stainless body pairs a rolled steel tube with aluminium-alloy covers and a 16 mm hard-chrome rod, so mist and light chemical splash are non-events. Sensor work is plug-and-play because the magnet ships standard; clip on CMSG, DMSG or EMSG. For budgeting, count on near 377 N of usable thrust at 0.5 MPa, which carries about 32 kg upward with a 2:1 margin built in.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X50-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X50-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M12×1.25 |
| 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 500 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MAJ40X50-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X50-20S Is Used
Index-stop pin on a rotary dial table
The stop screw dials the 20 mm window so the pin clears fixtures of different heights, and 628.3 N of push at 0.5 MPa locks dial position firmly.
Flap hold-down before a carton taping head
A padded pad presses top flaps flat ahead of the tape head; the magnet feeds an EMSG switch so the taping head only fires on a confirmed downstroke.
Part-present arm on a CNC bar feeder
The arm swings bar stock into the spindle catcher, and the stainless barrel survives the coolant mist that soaks this corner of the machine.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X50-20S the Right Cylinder?
Compare before you commit: a MAJ32 pushes 402 N at 0.5 MPa and a MAJ25 manages 245.3 N, while this 40 mm bore is the biggest the series makes, so upward moves mean a different family. If your load needs holding mid-travel, note the adjuster is a hard extend-stop only; with air off, the rod can settle, so latch the load separately. Mount it FA flange style on fixtures or LB feet on slides, add a Y knuckle for swivel joints, and count on the standard magnet for CMSG / DMSG / EMSG position signals.
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 MAJ40X50-20S FAQ
Push is 628.3 N at 0.5 MPa and pull is 527.8 N; at 0.7 MPa you get 879.6 N of push, and 128.1 kgf is the theoretical maximum at 1.0 MPa. Feed it 0.15-1.0 MPa (22-145 psi) via the 1/8" port.
Yes: the barrel is stainless steel rolled onto aluminium covers, and the 16 mm carbon-steel rod is hard-chrome plated about 20 um thick. That combination shrugs off mist, mild chemicals and outdoor duty far better than painted-steel minis.
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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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