Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-40S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-40S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø25mm bore and 400mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ25 mm
- Stroke400 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM10×1.25
- 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 MAJ25X400-40S
Built for long-reach push duty, the MAJ25X400-40S is a double-acting AirTAC mini cylinder whose extend stroke can be wound back up to 40 mm with an external stop screw. At 0.5 MPa it delivers 245.3 N on extend and 206.1 N on retract, rising to 343.4 N at 0.7 MPa. The 400 mm stroke sits past the 300 mm standard limit for this bore, so the barrel is produced to order.
The round body pairs a stainless-steel barrel with a hard-chrome plated rod, so damp washdown corners do not chew it up the way painted minis fail. A fixed anti-impact pad softens each stroke end (it decelerates only, it is not an adjustable cushion), and the magnet fitted as standard lets CMSG / DMSG / EMSG switches clip on. Keep continuous loads near 147 N at 0.5 MPa and the cylinder will run cool for years.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-40S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-40S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 400 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 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 MAJ25X400-40S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×400 | Stroke length in mm. |
| -40 | 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 MAJ25X400-40S Is Used
Long-station conveyor gate
A 400 mm throw swings a reject gate or lane diverter on a bottling line; the 40 mm window lets the crew dial the exact park position after install.
Parts-eject pusher
Ejects stampings off a press die at 245.3 N - ample for light-gauge brackets, with the stop screw set so parts land in the same bin spot each cycle.
Sample elevator in a test rig
Lifts about 12 kg vertically with a 2:1 margin, cycling sample trays between two bench levels inside a climate chamber.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-40S the Right Cylinder?
At 245.3 N push (0.5 MPa), bore 25 sits between the MAJ20 at 157.0 N and the MAJ32 at 402.2 N; step up a bore if your tooling mass grows. The stop screw is a mechanical end stop for the extend direction only - on sudden air loss the rod can still move, so clamp or brace any part that must stay put. For a 400 mm stroke keep the rod-side side load low and guide the load externally, since a 10 mm rod at this reach will bend under lateral force. FA flange or LB foot mounts plus I / Y knuckles cover most frame builds, and the standard magnet means position sensing is just a CMSG switch away.
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 MAJ25X400-40S FAQ
Push is 245.3 N and pull 206.1 N at 0.5 MPa; at 0.7 MPa push reaches 343.4 N and theoretical output peaks at 50 kgf. The external stop screw shortens the extend stroke by up to 40 mm from the ordered 400 mm; it cannot lengthen the stroke.
Yes. The rolled stainless tube and hard-chrome rod resist the mild corrosion that peels painted mini cylinders, and the fixed bumper pads cut stroke-end shock without any cushion plumbing. Operating range is 0.15-1.0 MPa (22-145 psi) and speed spans 30-800 mm/s.
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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