Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X100-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X100-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 100mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke100 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 MAJ40X100-20S
With a -20 ordering suffix, this MAJ40X100-20S carries an external stop screw that trims up to 20 mm off the 100 mm extend stroke after installation. Double-acting output reaches 628 N pushing at 0.5 MPa, with 528 N on the return stroke.
Construction is a rolled stainless barrel with aluminium end covers and a hard-chrome plated rod, so mild washdown or outdoor exposure will not flake paint or pit the tube the way painted minis suffer. Real-world budgeting: work with about 377 N at 0.5 MPa rather than the full 628 N nameplate. Magnetic position feedback is built in as standard - CMSG, DMSG and EMSG switches snap straight on.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X100-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X100-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 100 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 MAJ40X100-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 MAJ40X100-20S Is Used
Lift-and-lower gating on food tray conveyors
628 N of push force at 0.5 MPa raises tray stacks, and the 20 mm window calibrates home position so trays clear the guides cleanly.
Sample-carousel indexing in lab automation
Adjustable 20 mm top-of-stroke trim plus built-in magnet with EMSG sensing gives repeatable carousel detent positions in stainless-friendly labs.
Carton flap tucker on a case packer
The stainless barrel tolerates humid glue lines, and fixed bumper pads keep flap tucking quiet at speeds up to 800 mm/s.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X100-20S the Right Cylinder?
Forces between bores: the MAJ32X100 pushes 402 N at 0.5 MPa while this bore 40 manages 628 N - if your press or clamp needs more, step beyond the MA range to a larger cylinder. The 20 mm adjuster is a mechanical extension stop only; it never holds a load against air loss. Choose FA flange or LB foot for the body and I / Y knuckles on the rod side, and support any side load since the 100 mm stroke amplifies rod bending.
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 MAJ40X100-20S FAQ
At 0.5 MPa: 628 N push, 528 N pull. At 0.7 MPa: 880 N push, 739 N pull. Theoretical ceiling at 1.0 MPa is 128 kgf. Pressure range 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s, 1/8" ports on this 40 mm bore.
No. The 20 mm external adjuster stops the extend stroke mechanically at its set point; it is not a mid-stroke lock, and the piston drifts if air pressure is lost. For held positions, pair the cylinder with a locking valve or external mechanical latch. The magnet itself is standard, so CMSG / DMSG / EMSG switches report position.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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