Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X80-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X80-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 80mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke80 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 MAJ40X80-20S
Setup flexibility defines the MAJ40X80-20S: the extend stroke of this 80 mm, 40 mm bore cylinder is shortened on site within a 20 mm window by the external stop screw. Double-acting throughout, it delivers 879.6 N push at 0.7 MPa - useful for light press work - while running 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s.
The high-precision stainless barrel, riveted aluminium covers and 16 mm hard-chrome carbon-steel rod keep the cylinder sealed and rust-free in wet production halls, an edge over painted minis in food or outdoor spots. A 20 mm trim covers small batch-to-batch changes: one part may need a 62 mm extend stroke, the next 70 mm. Count on about 377 N of continuous push at 0.5 MPa after allowing margin from the full 628 N. The fixed bumper pad absorbs stroke-end shock but is not an adjustable cushion, and the stop screw is no mid-stroke lock; with air off, the rod drifts.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X80-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X80-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MAJ40X80-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MAJ40X80-20S Is Used
Bearing press-fit in small housings
879.6 N at 0.7 MPa seats 6200-series bearings into aluminium pump bodies without a hydraulic bench.
Glue head on a rotary packaging machine
A 20 mm setup trim switches between carton sizes without swapping the cylinder.
Ejection of stamped brackets
The stainless barrel tolerates lubricant mist around punch presses where painted bodies chalk and flake.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X80-20S the Right Cylinder?
For finer trimming, the MAJ40X80-10S narrows the window to 10 mm; if forces drop, the MAJ32 offers 402 N push at 0.5 MPa. The adjuster shortens the extend stroke only - it never reaches beyond the ordered 80 mm. Mount via FA flange or LB foot, or hang tooling from the M12x1.25 male rod thread with an I or Y knuckle; the standard magnet lets CMSG, DMSG and EMSG switches flag end positions on the barrel.
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 MAJ40X80-20S FAQ
Push is 628.3 N and pull 527.8 N at 0.5 MPa; at 0.7 MPa expect 879.6 N push and 738.9 N pull. The theoretical ceiling at 1.0 MPa is 128.1 kgf.
No. The external stop screw sets a mechanical end stop that shortens the extend stroke, while the fixed bumper pad only softens the landing. Adjustable cushioning needs the MACJ family, and the stop does not hold position when air is lost.
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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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