Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-30S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-30S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 25mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke25 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 MAJ40X25-30S
The MAJ40X25-30S is a double-acting round-body mini cylinder with a 25 mm stroke whose extend position can be trimmed on site within the -30 window via an external stop screw. At 0.5 MPa it pushes 628.3 N, so for a fixture clamp you can plan on roughly 377 N of real clamping work and still leave margin; pull force is 527.8 N on the return stroke.
The stainless-steel barrel and 16 mm hard-chrome plated rod shrug off the washdown and condensation that swell painted-steel minis, while the riveted aluminium covers and stainless block keep the body short. Every unit ships with a built-in magnet, so a CMSG or DMSG switch clips on without ordering a special piston. Note that the stop screw is a mechanical end stop, not a lock: on air loss the rod still drifts.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-30S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-30S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 MAJ40X25-30S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| -30 | 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 MAJ40X25-30S Is Used
Fixture clamping on a CNC machining center
Short 25 mm stroke and 628.3 N push at 0.5 MPa clamp aluminium housings in a drill fixture; the -30 window lets you dial the clamp point in after the fixture is built.
Part hold-down during a glue dispense cycle
The stop screw sets the exact press height on electronics assemblies; the built-in magnet feeds a CMSG switch to confirm the clamp is fully home.
Short push on a sorting gate
Moves small totes between two conveyor lanes; a 377 N working budget at 0.5 MPa keeps the gate moving even with light seal drag and back pressure.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-30S the Right Cylinder?
Between a 32 mm bore (402.2 N push at 0.5 MPa) and this 40 mm, size up when the clamp needs more than about 377 N of working force; 40 mm is the largest bore in the MA range. Port is 1/8", rod thread is M12x1.25 on a 16 mm rod. Mount on an FA flange or LB foot, add an I or Y knuckle at the rod end, and remember the adjustable version carries no SDB or back-cover code. Operating envelope: 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s.
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 MAJ40X25-30S FAQ
At 0.5 MPa the bore pushes 628.3 N and pulls 527.8 N; at 0.7 MPa those figures become 879.6 N push and 738.9 N pull. The theoretical maximum is 128.1 kgf at 1.0 MPa. The extend stroke trims on site within the -30 window through the external stop screw, and the rod travels 25 mm.
No. Every MA-series cylinder includes a built-in magnet as standard, so CMSG, DMSG and EMSG switches mount directly on the stainless barrel without a special-order piston. The fixed bumper pads soften stroke-end impact, but they are not adjustable air cushions - that feature belongs to the MACJ family.
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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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