Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X450-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X450-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø25mm bore and 450mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ25 mm
- Stroke450 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 MAJ25X450-20S
A 20 mm window on the stop screw defines the MAJ25X450-20S: commission the machine, dial the extend stroke back until the motion lands exactly where the fixture wants it, and lock it there. Push force is 245.3 N and pull 206.1 N at 0.5 MPa - enough to lift about 12 kg vertically once a 2:1 margin is applied to the 25 kg force equivalent.
Construction is the MA-family rolling-packed round body: a stainless barrel riveted between aluminium covers, a 10 mm hard-chrome rod, and fixed anti-impact pads that soften both stroke ends - deceleration only, not an adjustable air cushion like the MAC range. The 450 mm stroke is a made-to-order length (bore 25 tops out at 300 mm standard) and runs on 0.15-1.0 MPa (22-145 psi) air, proof tested at 1.5 MPa (215 psi), with speed from 30-800 mm/s.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X450-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X450-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 450 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 MAJ25X450-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×450 | 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 MAJ25X450-20S Is Used
Fill-nozzle depth setting on a liquid filler
Shave up to 20 mm off the extend stroke so nozzles stop just above the bottle neck; 245 N at 0.5 MPa also seats the shut-off valve.
Part-present probe on a CNC loading line
The probe carrier rides a 450 mm reach into the fixture, and the built-in magnet drives a CMSG switch for in-position confirmation.
Flap hold-down on a carton strapping machine
Presses the top flap while straps cycle; plan on about 147 N of usable push at 0.5 MPa rather than the full 245 N rating.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X450-20S the Right Cylinder?
Bore 25 splits the middle of the MA force table: 245.3 N push at 0.5 MPa against 157.0 N for bore 20 and 402.2 N for bore 32. If the load might hang or shift after a power loss, remember the adjuster is an extend-end stop, not a lock - the rod coasts on lost air. FA flange and LB foot mounting cover the frame options, the standard magnet pairs with CMSG / DMSG / EMSG switches, and a 450 mm stroke demands external guiding so bending loads stay off the 10 mm rod.
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 MAJ25X450-20S FAQ
At 0.5 MPa the bore 25 piston delivers 245.3 N forward and 206.1 N back; at 0.7 MPa, 343.4 N forward and 288.5 N back. The theoretical ceiling is 50 kgf at 1.0 MPa. The 10 mm rod carries an M10x1.25 thread, air ports are 1/8 inch, and the extend stroke trims by up to 20 mm via the external screw.
The pads at each stroke end are fixed bumpers that absorb the final impact, cutting noise and shock loads on the aluminium covers. They decelerate the last few millimeters only - they do not slow the cylinder mid-stroke. If your cycle needs tunable cushioning, the MACJ family combines the trim screw with adjustable air cushions instead.
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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.
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Most inquiries answered within 7-8 hours.
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