Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-30S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-30S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 125mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke125 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 MAJ40X125-30S
A 40 mm bore MAJ with a 125 mm stroke and a 30 mm adjustable extend window: an external stop screw lets you trim the reach on site without swapping cylinders. Double-acting throughout, it pushes 628.3 N and pulls 527.8 N at 0.5 MPa (22-145 psi operating range). That push works out to roughly 377 N of usable effort once you keep a 40% reserve, enough to index or clamp parts weighing around 32 kg in vertical lift terms with a 2:1 margin.
The body is a riveted round barrel in stainless steel with a hard-chrome plated rod, so it tolerates damp shops and periodic washdown far better than painted minis. Every unit leaves the factory with a built-in magnet, so CMSG, DMSG or EMSG switches snap on for end-of-stroke signalling. Fixed anti-impact pads soften both stroke ends; they decelerate but are not adjustable air cushions (that is the MAC family).
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-30S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-30S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MAJ40X125-30S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MAJ40X125-30S Is Used
Lift-gate ejector on an electronics test bench
The 30 mm trim lets technicians shorten the extend stroke so a fixture carriage lifts wafer trays exactly 95 mm instead of the full 125 mm, with 628.3 N of push to spare.
Bottle-capping press head
A capping turret uses the adjustable stop to seat caps at a repeatable depth, while the hard-chrome rod shrugs off daily wipe-downs with sanitizer.
Carton hold-down on a case packer
The cylinder clamps carton flaps with about 377 N of working force at 0.5 MPa, and LB feet bolt it straight to the machine frame.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-30S the Right Cylinder?
At this size class the MAJ40 is the top of the MA range: the 32 mm bore delivers 402.2 N at 0.5 MPa, so step up to this 40 mm model when your load needs the full 628.3 N. The stop screw is a mechanical extend limit only - if air is lost the rod can still be back-driven, so use a separate clamp or brake to hold position under load. Mount on an FA flange or LB foot, add I or Y rod knuckles where the tooling needs a swivel, and expect a 1/8" port and M12x1.25 male rod thread. With 125 mm of stroke, keep side loads low and guide the load externally to protect the 16 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 MAJ40X125-30S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa push rises to 879.6 N, and the theoretical maximum at 1.0 MPa is 128.1 kgf. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s, port size 1/8", rod thread M12x1.25, rod diameter 16 mm.
No. The external stop screw shortens the extend stroke anywhere within the 30 mm window; it is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air pressure drops. Fixed bumper pads soften the impact at each stroke end.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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