Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 20mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke20 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 MAJ40X20-20S
With the trim window matching the stroke itself, the MAJ40X20-20S offers a 20 mm double-acting stroke that can be shortened anywhere within 20 mm by its external stop screw. Force is the MA range's strongest: 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push at 0.7 MPa, 128.1 kgf theoretical at 1.0 MPa. Halving the lift capacity for margin still leaves about 32 kg of vertical lifting - handy when tooling weight is uncertain.
Build quality matches: a stainless round barrel riveted to aluminium covers, a 20 um hard-chrome plated rod, and a two-way piston seal that also retains grease. Fixed bumper pads limit end-of-stroke shock, the magnet ships as standard for CMSG / DMSG / EMSG switches, and the unit runs 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 MAJ40X20-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MAJ40X20-20S Is Used
Glue-dab head on a carton erecting machine
Each dab needs only millimetres of travel; with the 20 mm window matching the stroke, one cylinder serves several carton sizes.
Sample punch on a blister packing line
Punches foil samples at 628 N push, and the stainless barrel tolerates the line's frequent wipe-down cleaning regime.
Switch press in an appliance end-of-line tester
Depresses power switches consistently; the stop screw sets exact depth per model, and an EMSG switch confirms actuation.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-20S the Right Cylinder?
Force-wise, nothing in the MA family exceeds this 40 mm bore; the next size down, MAJ32, offers 402.2 N push and 345.6 N pull at 0.5 MPa for lighter clamps. The full-stroke 20 mm window shines when a machine family shares one mounting pattern but different products need slightly different travel - set each station with the stop screw instead of swapping cylinders. Specify FA flange or LB foot, with I or Y knuckles where a swivel joint helps.
Because the screw is a mechanical end stop, treat it as travel setting only: no mid-stroke holding and no resistance to drift when air pressure is lost.
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 MAJ40X20-20S 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; 128.1 kgf theoretical at 1.0 MPa. Ports are 1/8" for this 40 mm bore, with a 16 mm M12x1.25 chrome-plated rod.
Choose the FA flange for a rigid face mount or the LB foot for base fixing; I and Y rod knuckles are available for swivelling loads. The compact riveted round body needs little clearance, and the built-in magnet works with CMSG, DMSG and EMSG switches right out of the box.
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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