Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-10S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-10S 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 MAJ40X20-10S
Short strokes are where this 40 mm cylinder earns its keep: the MAJ40X20-10S packs 628.3 N of push (527.8 N pull) at 0.5 MPa into just 20 mm of travel, trimmable by 10 mm through an external stop screw. At 0.7 MPa push reaches 879.6 N, and the theoretical limit is 128.1 kgf at 1.0 MPa. Keeping about 377 N in reserve as usable working force means ample margin for clamping thin sections or shearing a light pin.
Because the barrel is stainless steel riveted into aluminium-alloy covers with a 20 um hard-chrome rod, the cylinder tolerates coolant mist and periodic washdown far better than painted-steel minis. Fixed anti-impact pads - bumpers only, not adjustable cushions - soften both stroke ends, and the magnet built in as standard accepts CMSG / DMSG / EMSG switches. Air: 0.15-1.0 MPa (22-145 psi); speed 30-800 mm/s.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-10S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-10S |
|---|---|
| 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 MAJ40X20-10S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | Stroke length in mm. |
| -10 | 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 MAJ40X20-10S Is Used
Hold-down on a PCB depaneling press
Clamps the panel edge before the cutter passes; the brief 20 mm travel keeps cycle time high while 628 N holds the board rigid.
Ejector pin on a brass fitting lathe
Knocks finished fittings off the mandrel with 377 N of usable force, the 10 mm window adjusting to different part lengths.
Door latch actuator in a vending cabinet
The compact riveted round body hides inside the door frame, and the built-in magnet feeds a CMSG switch to confirm latching.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X20-10S the Right Cylinder?
With only 20 mm of travel, sizing is mostly about force and envelope: the MAJ32 delivers 402.2 N push and 345.6 N pull at 0.5 MPa if 628 N is more than the part needs, while bore 40 is the largest MA offers. The 10 mm window lets maintenance trim the extend stop by a few millimetres without shimming. FA flange or LB foot mounting, plus I or Y rod knuckles, covers most fixture layouts, and the short stroke means negligible rod bending as long as the load stays centred on the 16 mm rod.
The adjuster is an end stop, so it never holds position mid-stroke or against air loss - the piston still drifts if supply fails.
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 MAJ40X20-10S FAQ
At 0.5 MPa: 628.3 N push, 527.8 N pull. At 0.7 MPa: 879.6 N push, 738.9 N pull. Theoretical maximum 128.1 kgf at 1.0 MPa. This bore carries a 16 mm hard-chrome rod (M12x1.25) and 1/8" ports, running 0.15-1.0 MPa (22-145 psi).
No. The MAJ carries fixed anti-impact pads that decelerate the rod at stroke ends, and they cannot be tuned. If the machine needs adjustable cushioning, the MACJ is the corresponding variant with that feature.
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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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