Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X300-40S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X300-40S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 300mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke300 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 MAJ40X300-40S
Few minis reach this force class: 628.3 N push and 527.8 N pull at 0.5 MPa, climbing to 879.6 N at 0.7 MPa, all from a 40 mm round body about as wide as its covers. The 40 mm adjustable window is the widest offered, letting maintenance teams re-tune the extend stroke repeatedly as tooling changes, across a 0.15-1.0 MPa (22-145 psi) plant supply.
Riveted construction - stainless barrel, aluminium-alloy covers, stainless block - gives a slim, service-light body that stands up to humidity and washdown better than painted steel units, and the 20 um hard-chrome plating on the 16 mm rod resists scoring over long strokes. Do the arithmetic once: budget about 377 N for real work at 0.5 MPa, or trust the bore with roughly 32 kg of vertical lift on a 2:1 margin.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X300-40S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X300-40S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MAJ40X300-40S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -40 | 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 MAJ40X300-40S Is Used
Case-ejector on carton line
Ejecting heavy cartons off a corrugated packaging conveyor at up to 800 mm/s, with the 40 mm window absorbing tray-height changes between SKUs without cylinder swaps.
CNC bar-pull assist
Bar-feeder gripper arms on a lathe cell exploit 628.3 N of push at 0.5 MPa, while DMSG switches on the standard magnet verify grip before each cycle starts.
Sorting-arm pusher
Diverting totes between warehouse conveyor lanes, the stainless riveted barrel copes with unconditioned air in an unheated cross-dock, trimmed 40 mm to suit differing lane widths.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X300-40S the Right Cylinder?
Against its stablemates, this bore roughly doubles the 20 mm size (157.0 N push at 0.5 MPa) and sits a class above the 32 mm unit (402.2 N) - only the 40 mm size reaches 628.3 N, making it the top of the MA mini line, with MACJ available if adjustable cushioning is also required. The 300 mm stroke sits comfortably inside the 500 mm standard limit for this bore.
Use the external screw purely to set the end of extension; it is not a mid-stroke lock and offers no resistance to drifting when air fails. Fixture designers can pick FA flange or LB foot mounting, and side loads should be carried by external guideways over a stroke this long.
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 MAJ40X300-40S FAQ
Push 628.3 N and pull 527.8 N at 0.5 MPa; push 879.6 N and pull 738.9 N at 0.7 MPa; theoretical maximum 128.1 kgf at 1.0 MPa. Supply pressure 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s, with 1/8" ports and an M12x1.25 rod thread on a 16 mm rod.
It carries fixed anti-impact bumper pads that decelerate the piston at each stroke end, which is different from the adjustable air cushioning found on the MAC family. The external stop screw sets where the extend stroke terminates within the 40 mm window; it cannot add stroke beyond the ordered 300 mm.
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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