Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X65-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X65-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 65mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke65 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 MAJ40X65-20S
Small machine envelopes often still need real force, and the MAJ40X65-20S answers with 40 mm of bore in a slim riveted stainless body, a 65 mm stroke, and a stop screw that trims the extend stroke within a tight 20 mm window for repeatable positioning. The hard-chrome plated 16 mm rod and stainless tube stand up to splash and humidity that would pit a painted mini cylinder over a season outdoors.
At 0.5 MPa the bore pushes 628.3 N - enough to lift about 32 kg vertically with a 2:1 safety margin, or to seat, eject or gate a similarly sized load. Bumper pads are fixed in both covers to soften stroke-end impact, the magnet is included as standard equipment for CMSG / DMSG / EMSG switches, and 1/8" ports on each cover keep plumbing simple.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X65-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X65-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 65 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 MAJ40X65-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 MAJ40X65-20S Is Used
Compact indexing lift
Raises a 30 kg fixture plate between stations in a tight assembly head, where a larger tie-style actuator would not fit.
Reject gate
Pushes a reject flap lever on a tablet-checking line, switching verified by a DMSG sensor riding on the standard piston magnet.
Sample tray positioner
Positions sample trays in a lab analyzer, the 20 mm trim delivering a repeatable reach without shimming mechanical stops.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X65-20S the Right Cylinder?
Look below this model when force allows: the bore 32 MA cylinder delivers 402.2 N push at 0.5 MPa, while this 40 mm bore raises that to 628.3 N, the largest the series offers. The 20 mm adjust window suits fixed tooling where reach changes rarely; for frequent re-gauging, a wider window version gives more travel to play with. Mount with an FA flange or LB foot; I and Y rod knuckles are available, though the adjustable cylinder carries no SDB option. Do not rely on the stop screw to hold a load - with air removed the piston can creep, so trap pressure or fit a mechanical lock instead. Operating range is 0.15-1.0 MPa (22-145 psi) at 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 MAJ40X65-20S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa push reaches 879.6 N, and the theoretical maximum at 1.0 MPa is 128.1 kgf. The external stop screw shortens the extend stroke anywhere within the ordered 20 mm window. Pressure runs 0.15-1.0 MPa (22-145 psi) and speed spans 30-800 mm/s.
The screw sets the extend stroke limit and can be re-set on the machine, but it never lengthens travel past the 65 mm ordered stroke. It acts as a mechanical end stop, not a mid-stroke lock: with air removed the piston can still creep under load, so trap pressure or fit an external lock when the load must stay put. Mounting choices are FA flange and LB foot, plus I and Y knuckles (no SDB on adjustable models).
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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