Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-50S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-50S 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 MAJ40X450-50S
Wide-trim flexibility defines the MAJ40X450-50S: a 50 mm adjustable window lets the extend stroke land anywhere from 400 to 450 mm after installation, set by an external stop screw rather than a reorder. Underneath sits the standard 40 mm MA powerplant - 628.3 N push, 527.8 N pull at 0.5 MPa, climbing to 879.6 N at 0.7 MPa - moving a 16 mm hard-chrome rod at 30-800 mm/s.
The riveted round body pairs a stainless barrel with aluminium-alloy covers, so humid food-plant or outdoor air does not eat the housing the way it does painted minis. Built into every piston is the position magnet, standard, ready for CMSG, DMSG or EMSG switches. As a buyer rule of thumb, size for about 377 N of real push at 0.5 MPa; that is a vertical lift of roughly 32 kg with a 2:1 safety factor.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-50S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-50S |
|---|---|
| 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 MAJ40X450-50S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | Stroke length in mm. |
| -50 | 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 MAJ40X450-50S Is Used
Curtain opener on a textile folder
Drawing heavy fabric curtains across a folding machine, where the 50 mm window absorbs cloth stretch from season to season.
Chip conveyor gate control
Metering metal scrap flow under a CNC line with 628.3 N of push at 0.5 MPa, the stainless barrel shrugging off coolant mist.
Weld fixture clamp arm
Swinging a fixture arm into place on a car-frame jig, trimming the stroke after retooling without pulling the cylinder off the LB foot.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X450-50S the Right Cylinder?
If the 50 mm window is more trim than the machine needs, the -20 and -30 versions of the same 450 mm cylinder cost less; if less force is needed, the MAJ32 bore still gives 402.2 N at 0.5 MPa. For loads above this bore's 128.1 kgf theoretical ceiling, move to the cushioned MACJ family. The adjuster is a hard end stop on the extend side only - under air loss the rod is free to move, so add a separate locking solution where position must be held. FA flange and LB foot mounts cover static fixings, I and Y knuckles handle pivoting rod ends, and at 450 mm of stroke the 16 mm rod should see its load guided, not side-loaded.
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 MAJ40X450-50S FAQ
Push 628.3 N and pull 527.8 N at 0.5 MPa; 879.6 N and 738.9 N at 0.7 MPa; theoretical peak 128.1 kgf at 1.0 MPa. The bore takes 1/8" ports, runs 30-800 mm/s, and accepts 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof rating.
An external stop screw on the head limits rod extension anywhere within the ordered 50 mm window, so the effective extend stroke can be shortened on site from 450 mm down to 400 mm. It cannot extend past the ordered stroke, and it works as a mechanical stop plus fixed bumper - not an adjustable air cushion and not a load brake.
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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