Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-20S 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 MAJ25X400-20S
Twenty millimetres of on-site adjustment gives the MAJ25X400-20S a useful middle ground: wide enough to absorb fixture tolerances, tight enough to keep the 245.3 N push at 0.5 MPa landing exactly where the process needs it. The double-acting piston rides in a stainless round barrel riveted to aluminium covers, with a hard-chrome plated 10 mm rod and fixed anti-impact bumpers at each end of travel.
At 400 mm the stroke runs beyond the 300 mm standard limit for a 25 mm bore, so this model ships as a made-to-order build; the piston magnet, by contrast, is always standard, letting CMSG, DMSG and EMSG switches drop straight on. Bump supply to 0.7 MPa and push reaches 343.4 N against a 50 kgf theoretical ceiling.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-20S |
|---|---|
| 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 MAJ25X400-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×400 | 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 MAJ25X400-20S Is Used
Tote-lane diverters
A distribution centre sorts totes into chutes, the 20 mm window matching lane spacing changes between SKU runs.
Press-fit bushing inserter
Maintenance teams set insertion depth per housing batch, relying on 245.3 N at 0.5 MPa for aluminium bushings.
Battery-tray locate pin
An EV assembly cell extends a locate pin into tray slots; CMSG sensing via the standard magnet confirms lock-in.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ25X400-20S the Right Cylinder?
Neighbouring bores frame the choice: MAJ20 pushes 157 N at 0.5 MPa and MAJ32 pushes 402.2 N, so stay at 25 mm when the load falls in between. Budget about 147 N of that 245.3 N rating for real work - the equivalent of hoisting near 12 kg vertically with a 2:1 margin. On a stroke this long, carry side loads on external guides, not on the rod. Choose FA flange or LB foot fixing with I or Y rod knuckles as needed, and remember the trim screw is an extend end stop, not a load-holding brake: without air pressure the piston can still move.
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 MAJ25X400-20S FAQ
Push 245.3 N and pull 206.1 N at 0.5 MPa; push 343.4 N and pull 288.5 N at 0.7 MPa; theoretical maximum 50 kgf at 1.0 MPa. The extend stroke trims within the ordered 20 mm window via an external stop screw, working pressure spans 0.15-1.0 MPa (22-145 psi), and the 400 mm stroke is a made-to-order length above the bore's 300 mm standard.
FA flange and LB foot brackets attach the body, while I and Y rod knuckles handle pivoting load links; note the adjustable-stroke version has no SDB option. Impact at stroke ends is soaked up by fixed bumper pads - they decelerate the piston but are not adjustable air cushions, which remain the preserve of the MAC 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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