Airtac JSI Series Standard Cylinder JSI50X550STC
The AirTAC Airtac JSI Series Standard Cylinder JSI50X550STC is a genuine double acting JIS-standard air cylinder with a Ø50mm bore and 550mm 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
- Stroke550 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 JSI50X550STC
Delivering 982 N of push force at 0.5 MPa, this double-acting profile cylinder saves valuable machine space by being noticeably shorter than an ISO 15552 unit of the same 50 mm bore. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life. Because the -S suffix indicates a built-in piston magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing.
For real-world sizing, plan for about 589 N of actual work at 0.5 MPa, which translates to lifting roughly 50 kg vertically with a 2:1 safety margin. The unit features a 20 mm piston rod, a G1/4 port, and M18x1.5 rod-end thread. Operating pressure spans 0.15-1.0 MPa, and the adjustable air cushions at both ends decelerate the piston smoothly across the 550 mm stroke.
Airtac JSI Series Standard Cylinder JSI50X550STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI50X550STC |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 550 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 JSI50X550STC
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 50 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×550 | 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 JSI50X550STC Is Used
Carton Diverting
Pushes packages laterally across packaging lines using the 982 N push force, with the TC trunnion allowing the body to pivot smoothly during the 550 mm travel.
Vertical Material Lift
Raises lightweight tote bins up to 50 kg in pick modules, relying on the -S magnet and DMSE switches to confirm the fully raised position.
Guard Door Actuation
Opens and closes heavy machine safety gates over a long 550 mm distance, where the compact JIS profile minimizes interference with moving slides.
Is the Airtac JSI Series Standard Cylinder JSI50X550STC the Right Cylinder?
When sizing this 50 mm bore, stepping down to a 40 mm bore drops the 0.5 MPa push force to 628 N, while stepping up to a 63 mm bore raises it significantly to 1559 N. The included TC trunnion mount provides a pivoting centerline interface that accommodates slight misalignment on your fixture. Because this model features a 550 mm stroke, you must support the load with external guides to prevent rod bending and premature seal wear caused by side loads.
Remember that a standard air cylinder drifts when air is lost or the valve is centered, as the end cushions only decelerate motion and never act as a lock. To hold a vertical load securely in place during an air failure, fit an external rod lock or a pilot-operated check valve to the circuit.
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 JSI50X550STC FAQ
At 0.5 MPa it provides 982 N push and 825 N pull. At 0.7 MPa it provides 1374 N push and 1154 N pull. The theoretical maximum force is 200 kgf at 1.0 MPa. The air port size is G1/4, and the operating speed range is 30-800 mm/s.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 50 mm bore, saving space on tight machinery. It uses a hard-anodized aluminum extruded barrel without external rods, and the -S suffix means it has a built-in magnet for CMSE/DMSE sensors.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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