Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 450mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke450 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 MAJ40X450-20S
For the heaviest jobs in the MA mini range, the MAJ40X450-20S pairs a 40 mm bore with a 450 mm stroke and a 20 mm extend-trim window set by an external stop screw. Double-acting air gives 628.3 N push and 527.8 N pull at 0.5 MPa, rising to 879.6 N at 0.7 MPa, so one unit can index loads that would stall a 32 mm bore (402.2 N). The stainless round barrel is riveted to the aluminium covers in a sealed rolling-packed body, riding on a hard-chrome plated 16 mm rod that shrugs off washdown and damp shop air.
Practical sizing: at 0.5 MPa the usable push is roughly 377 N once a 60 percent margin is applied, which vertically lifts about 32 kg at a 2:1 factor. Every unit ships with the magnet already built in, so CMSG, DMSG or EMSG switches snap on for end-of-stroke detection, and the fixed bumper pads soften the stop without any air cushion setting.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 450 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 MAJ40X450-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 MAJ40X450-20S Is Used
Pallet stacker lift
Raising loaded pallet boards up to 32 kg on a packaging line end-of-arm, with the 20 mm window tuned to seat each layer without slamming.
Belt tensioner ram
Pushing 377 N of useful force into a heavy-duty conveyor take-up sled, trimming the stroke so tension stays repeatable across 430-450 mm.
Stamping press kick-off
Ejecting formed sheet-metal blanks from a press die, where the 628.3 N push clears parts fast at speeds up to 800 mm/s.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-20S the Right Cylinder?
Compare before you buy: if 628.3 N at 0.5 MPa is more than the job needs, the MAJ32 delivers 402.2 N at the same pressure in a slimmer package; there is no larger MA bore, so 40 mm is the ceiling and the cushioned MACJ series is the step beyond 128.1 kgf theoretical. At 450 mm stroke, keep side load off the 16 mm rod and guide the load externally, since long strokes magnify bending. Mount on the FA flange or LB foot and add I or Y knuckles on the M12x1.25 rod thread. One caution: the stop screw trims the extend stroke only and is not a position lock, so on air loss the rod can still drift.
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 MAJ40X450-20S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa push rises to 879.6 N with 738.9 N pull. Theoretical maximum at 1.0 MPa is 128.1 kgf. Working pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s.
No. The magnet is built in as standard, so CMSG, DMSG or EMSG switches mount straight onto the 40 mm barrel for position feedback. This bore takes 1/8" ports and the rod thread is M12x1.25.
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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