Airtac JSI Series Standard Cylinder JSI50X40S
The AirTAC Airtac JSI Series Standard Cylinder JSI50X40S is a genuine double acting JIS-standard air cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. Its no-tie-rod, hard-anodized profile barrel is more compact than an ISO 15552 cylinder of the same bore — a space-saver on tight machines.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM18×1.5
- CushionAdjustable, 20.5 mm
- 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 JSI Series Standard Cylinder JSI50X40S
Generating 982 N of push force at 0.5 MPa, the AirTAC JSI50X40S is a double-acting JIS-standard profile cylinder built for tight machinery layouts. Its extruded hard-anodized aluminum barrel omits external rods, making the unit shorter and more compact than an ISO 15552 cylinder of the same 50 mm bore. A heterogeneous two-way piston seal retains grease for long, low-friction life, while the integrated -S magnet allows CMSE or DMSE switches to drop directly into the side grooves for position sensing.
The 40 mm stroke operates at 30-800 mm/s through a G1/4 port, with an M18x1.5 rod thread and 20.5 mm adjustable air cushions at both ends to decelerate the piston smoothly. For practical sizing, plan for about 589 N of real work at 0.5 MPa, which translates to lifting roughly 50 kg vertically with a 2:1 safety margin.
Airtac JSI Series Standard Cylinder JSI50X40S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI50X40S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M18×1.5 |
| 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 | Adjustable, 20.5 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC JSI (JIS standard) datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G. Barrel: hard-anodized aluminum profile (no tie rods).
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac JSI Series Standard Cylinder JSI50X40S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 50 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×40 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensors. |
JSI-family variants: JSI (double acting), JSID (double rod), JSIJ (adjustable stroke). Mounting: LB / FA / FB / CA / CB / CR / TC / TCM1 / TCM2. Thread PT (blank) / G.
Where the Airtac JSI Series Standard Cylinder JSI50X40S Is Used
Package Diverting
Actuates a routing flap on a packaging conveyor to push 50 kg cartons onto a secondary belt at high speed.
Clamp Actuation
Secures aluminum extrusions in a CNC machining fixture using roughly 589 N of reliable clamping force.
Pallet Stop Gate
Controls a pneumatic stop gate on a roller conveyor to stage heavy totes before an automated stretch wrapper.
Is the Airtac JSI Series Standard Cylinder JSI50X40S the Right Cylinder?
When sizing this 50 mm bore, dropping down to a JSI40 yields 628 N of push force at 0.5 MPa, whereas stepping up to a JSI63 provides 1559 N, giving you clear boundaries for your load requirements. The included -S magnet pairs perfectly with CMSE or DMSE sensors for end-of-stroke detection. Because the 40 mm stroke is quite short, side-load stress is minimal, but remember that a standard cylinder drifts if air pressure is lost or the valve is centered; the air cushions only decelerate the piston near stroke end and do not act as a brake. Use an external rod lock or pilot-operated check valve if the application requires the load to be held securely in place.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
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 Set cushions to minimum, then release gradually.
- check Use correct mounting accessory (LB/FA/FB/CA/CB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac JSI Series Standard Cylinder JSI50X40S FAQ
The JSI50X40S delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push and 1154 N pull at 0.7 MPa, with a theoretical maximum of 200 kgf at 1.0 MPa. It uses a G1/4 air port and features a 20 mm piston rod with an M18x1.5 thread.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. The -S suffix indicates a built-in piston magnet, allowing CMSE or DMSE electronic or reed switches to be installed directly into the extruded barrel's side grooves.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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