Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-40S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-40S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 250mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke250 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 MAJ40X250-40S
Pushing 628.3 N at 0.5 MPa, the MAJ40X250-40S tops the round-body MA mini range, with an extend stroke you can trim by up to 40 mm using the external stop screw. Air drives the piston both ways, and the riveted stainless barrel plus hard-chromed 16 mm rod shrug off the mild corrosion that kills painted minis in damp plants.
For sizing, treat about 377 N as realistic continuous push at 0.5 MPa; that also means a part weighing near 32 kg can be lifted vertically at a 2:1 margin. The fixed anti-impact pad softens stroke ends (it decelerates, it is not an air cushion), and the built-in magnet works with CMSG, DMSG and EMSG switches right out of the box.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-40S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-40S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MAJ40X250-40S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MAJ40X250-40S Is Used
Bench press fixture
Delivers 628 N at 0.5 MPa for light press-fitting of bushings into aluminium housings; the 40 mm window lets a setter dial in final depth on the bench.
Tray divider actuator
Rakes divider blades across a 250 mm tray section at up to 800 mm/s; the stainless barrel tolerates condensation near the chiller.
Position-verified clamp
A CMSG switch on the standard magnet confirms full extend before the PLC releases the clamped part to the next station.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-40S the Right Cylinder?
A 32 mm MAJ pushes 402.2 N at 0.5 MPa, so choose 40 mm once your load passes roughly 350 N - there is no larger bore in this series to step up to. The 40 mm trim window suits jigs where the final position gets tuned after installation.
FA flange or LB foot mounting bolts straight onto brackets, and I or Y rod knuckles handle pivoting links. With 250 mm of travel, guide the load so side force stays off the rod, and keep in mind the stop screw sets the end of travel only; it will not hold a load against drift when air pressure drops.
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 MAJ40X250-40S FAQ
Expect 628.3 N push and 527.8 N pull at 0.5 MPa, climbing to 879.6 N push at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa. Run the air between 0.15-1.0 MPa (22-145 psi) and keep rod speed within 30-800 mm/s.
No. Every MAJ ships with a magnet built in, so CMSG, DMSG or EMSG switches mount directly on the stainless barrel for end-of-stroke signalling without a special-order piston.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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