Airtac JSI Series Standard Cylinder JSI50X550
The AirTAC Airtac JSI Series Standard Cylinder JSI50X550 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 JSI50X550
Generating 982 N of push force at 0.5 MPa, the AirTAC JSI50X550 is a double-acting JIS-standard profile cylinder built for long-reach tasks. 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. The internal two-way piston seal retains grease, ensuring low-friction operation over a long service life. Air enters via a G1/4 port, driving a 20 mm rod with an M18x1.5 thread at speeds of 30-800 mm/s.
Because this SKU lacks the -S magnet, it cannot host CMSE or DMSE position sensors. For sizing, plan for roughly 589 N of real work at 0.5 MPa, which equates to lifting about 50 kg vertically with a 2:1 safety margin. The adjustable 20.5 mm air cushions at both ends absorb kinetic energy near stroke end, though they act only as decelerators and will not hold a load if air pressure drops.
Airtac JSI Series Standard Cylinder JSI50X550 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI50X550 |
|---|---|
| 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 JSI50X550
| 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 JSI50X550 Is Used
Carton Push-Off Mechanism
Pushes packaged cartons across a 550 mm transfer gap with 982 N of force, relying on the hard-anodized barrel for smooth operation in dusty packaging lines.
Pallet Elevator Gate
Actuates a horizontal safety gate on a pallet lift, where the compact JIS profile saves valuable headroom compared to standard ISO 15552 units.
Lab Sample Indexer
Moves sample trays through a 550 mm testing zone, benefiting from the grease-retaining NBR piston seal for consistent low-friction movement.
Is the Airtac JSI Series Standard Cylinder JSI50X550 the Right Cylinder?
When sizing this 50 mm bore, consider the adjacent JSI options: a 40 mm bore yields 628 N push at 0.5 MPa, while stepping up to a 63 mm bore provides 1559 N. This JSI50X550 variant has no -S magnet, meaning direct magnetic sensing is impossible without switching to the -S version. For a suspended or vertical load, remember that a standard cylinder drifts when air is lost or the valve centers; integrate an external rod lock or pilot-operated check valve to secure the position. Furthermore, the 550 mm stroke demands careful attention to side loads—always use external guide rails to prevent rod bending and premature seal wear.
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 JSI50X550 FAQ
At 0.5 MPa, the JSI50X550 provides 982 N push and 825 N pull. At 0.7 MPa, it delivers 1374 N push and 1154 N pull. The theoretical maximum force is 200 kgf at 1.0 MPa. It features a G1/4 port, an M18x1.5 rod thread, and operates at 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. It does not hold a load if air is lost; the adjustable air cushions only decelerate the piston near the stroke ends. For position holding, use an external rod lock or pilot-operated check valve.
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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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