Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-20S 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 MAJ25X40-20S
Bore 25 power in a riveted stainless round body: the MAJ25X40-20S is double-acting with an extend stroke that the external stop screw trims anywhere from the full 40 mm down to 20 mm on the machine itself. At the common 0.5 MPa shop supply it pushes 245.3 N and pulls 206.1 N, and the hard-chrome carbon-steel rod keeps sliding true through spray-mist and dusty cells alike.
For a vertical pick, the raw 245.3 N equals about 25 kgf of lift, so a 2:1 margin leaves roughly 12 kg you can raise safely at 0.5 MPa. The fixed bumper pads absorb the stroke-end shock without an air cushion circuit, and because the magnet ships standard, a CMSG or DMSG switch drops onto the barrel the day the cylinder arrives.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-20S |
|---|---|
| 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 MAJ25X40-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MAJ25X40-20S Is Used
Carton flap tuck station
Folds top flaps on small cosmetic cartons; the 20 mm trim window lets one cylinder serve both shallow and deep flap boxes on the same line.
Vial stopper press
Seats rubber stoppers on a pharma bench top; the stainless barrel tolerates the repeated alcohol wipe-downs this area demands.
Bin-full kicker
Tips small parts bins at a shelf pick station once full, with a DMSG switch telling the PLC the bin has cleared.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X40-20S the Right Cylinder?
Compare both directions before you buy: the bore 20 MA (157 N push at 0.5 MPa) suits lighter tucking and indexing, while the bore 32 MAJ (402 N) is the step up for heavier press-fit work. This 25 mm version, with its 20 mm trim window and 1/8" ports, is the middle pick. Mounting runs to FA flange, LB foot, or an I or Y knuckle on the rod. Remember the trim screw is a positioning stop, not a brake - with air removed the piston moves freely, so use a valve for load holding.
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 MAJ25X40-20S FAQ
This bore 25 cylinder gives 245.3 N push and 206.1 N pull at 0.5 MPa, 343.4 N push at 0.7 MPa, and 50.0 kgf theoretical maximum force at 1.0 MPa. Operating pressure spans 0.15-1.0 MPa (22-145 psi), speed runs 30-800 mm/s, and the extend stroke adjusts across a 20 mm window.
Fixed bumper pads are set inside both covers to decelerate the piston at each end of travel, cutting metal-to-metal shock. They are passive dampers only - they are not adjustable air cushions, which belong to the MACJ family.
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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