Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-50S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-50S 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 MAJ40X125-50S
When a 125 mm stroke needs on-site shortening by up to 50 mm, this 40 mm bore MAJ does it through an external stop screw - no cylinder swap, no spacer kit. Double-acting air delivers 628.3 N forward and 527.8 N back at 0.5 MPa, rising to 879.6 N forward at 0.7 MPa. Plan on roughly 377 N of real working push at 0.5 MPa, roughly the force to hoist a 32 kg assembly vertically with a 2:1 reserve.
The riveted round-body build packs a 40 mm bore into a slim stainless envelope, easier to tuck into cramped machine frames than a profile cylinder of equal force. A magnet is built into the piston as standard, so CMSG, DMSG or EMSG switches mount directly on the barrel for position checks. Fixed anti-impact pads absorb end-of-stroke shock; for true adjustable cushioning AirTAC's MACJ is the related model to look at.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-50S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-50S |
|---|---|
| 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 MAJ40X125-50S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -50 | 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 MAJ40X125-50S Is Used
Depth stop on a pneumatic drill fixture
Wood-furniture lines use the 50 mm window to set drilling depth per product changeover, trusting the stop screw for repeatable 628.3 N feed.
Rotary-index gate actuator
The cylinder swings an index gate clear of a filling carousel, with the magnet plus an EMSG switch proving the gate is fully open before bottles advance.
Tote-lid press in a cold-store packing hall
At 0.5 MPa the cylinder seats tote lids with about 377 N of usable push, and the stainless barrel copes with condensation near the chiller doors.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X125-50S the Right Cylinder?
Force ladder: the 32 mm MAJ makes 402.2 N at 0.5 MPa and this 40 mm bore makes 628.3 N, so the choice hinges on whether your worst-case load passes about 400 N. The trim screw shortens extension only and acts as a hard stop - it will not lock the rod against drifting if supply air is cut, so design a separate means of holding the load. Pick FA flange or LB foot mounting, I or Y rod knuckles if the tool must pivot, and note the 1/8" port and M12x1.25 rod thread for plumbing. At 125 mm stroke, side loads should be carried by external guides, not 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 MAJ40X125-50S FAQ
At 0.5 MPa: 628.3 N push, 527.8 N pull. At 0.7 MPa: 879.6 N push. Maximum theoretical output at 1.0 MPa is 128.1 kgf. The bore is 40 mm, the rod 16 mm (M12x1.25 thread), the port 1/8", and the extend stroke trims within the ordered 50 mm window.
A stop screw mechanically limits rod extension anywhere inside the 50 mm window ordered. It shortens the stroke on site; it never extends beyond 125 mm and it does not brake or hold the piston, so a loaded rod will still sag if air is lost. Bumper pads at each end soften the residual impact.
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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