Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-40S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-40S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø25mm bore and 40mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ25 mm
- Stroke40 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 MAJ25X40-40S
The whole stroke is the adjustment here: on the MAJ25X40-40S the external stop screw can shorten the extend stroke by up to the full 40 mm, turning one cylinder into a family of settings for changeover-heavy machines. Double-acting on a riveted stainless round barrel, it produces 245.3 N push and 206.1 N pull at 0.5 MPa, rising to 343.4 N push at 0.7 MPa.
Divide the 245.3 N push by gravity and you get a 25 kg lift equivalent; keep a 2:1 margin and plan vertical lifts of about 12 kg per cylinder at 0.5 MPa. The fixed bumper pads tame end-of-stroke impact at speeds up to 800 mm/s, and since the magnet is standard equipment, CMSG, DMSG and EMSG switches attach with no special-order piston.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-40S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-40S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 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 MAJ25X40-40S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MAJ25X40-40S Is Used
Punch-die part ejection
Ejects punched shims from a small press die; operators re-trim the stroke whenever the die changes, with no cylinder swap.
Tote diverter at a sortation junction
Pushes plastic totes onto a spur line at a warehouse junction, the extend stroke set precisely to the spur width.
Process-skid valve actuation
Opens and closes a small ball valve on a water-treatment skid, trimmed to the valve travel and monitored by a CMSG switch.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-40S the Right Cylinder?
Size against the real alternatives: a bore 20 MA offers 157 N push at 0.5 MPa for light tuck and kick duty, while a bore 32 MAJ raises the ceiling to 402 N for press-fit work; this 25 mm, fully trimmable version covers the span between with one SKU. At 40 mm of stroke side loads stay modest, but keep the 10 mm rod - M10x1.25 thread - guided if the tooling overhangs. FA flange, LB foot, and I or Y knuckles handle mounting. Note the adjuster sets position, not holding: on air loss the rod still drifts, so a valve must gate the supply when the load has to stay put.
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 MAJ25X40-40S FAQ
At 0.5 MPa: 245.3 N push, 206.1 N pull. At 0.7 MPa: 343.4 N push. Theoretical maximum: 50.0 kgf at 1.0 MPa. Supply pressure 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-800 mm/s, extend trim window 40 mm.
Bore 25 uses a 10 mm hard-chrome plated rod with an M10x1.25 male thread and 1/8" air ports. Mount via the FA flange or LB foot, or pick an I or Y rod knuckle; the adjustable-stroke variant omits the SDB and back-cover codes. The anti-impact bumpers are fixed, and the magnet for CMSG, DMSG or EMSG switches is already installed.
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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