Airtac JSI Series Standard Cylinder JSI50X55
The AirTAC Airtac JSI Series Standard Cylinder JSI50X55 is a genuine double acting JIS-standard air cylinder with a Ø50mm bore and 55mm 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
- Stroke55 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 JSI50X55
Delivering 982 N of push force at 0.5 MPa, this double-acting 50 mm bore cylinder is built for tight machinery layouts where every millimeter counts. As a JIS-standard profile unit, it is noticeably shorter and more compact than a same-bore ISO 15552 cylinder, giving you valuable real estate back on the machine bed. The extruded hard-anodized aluminum barrel sheds external rods for a clean, wear-resistant exterior, while the two-way piston seal retains grease for a long, low-friction service life.
Because this specific SKU lacks the -S magnet, it cannot host CMSE or DMSE position switches without changing the variant. In practical terms, plan for roughly 589 N of actual work at 0.5 MPa, which translates to lifting about 50 kg vertically with a 2:1 safety margin. The unit features a G1/4 port, an M18x1.5 rod thread, and adjustable 20.5 mm air cushions at both ends to smooth out the 55 mm stroke.
Airtac JSI Series Standard Cylinder JSI50X55 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI50X55 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 55 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 JSI50X55
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 50 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×55 | 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 JSI50X55 Is Used
Package Diverter Gate
Actuates a routing flap on a 50 kg capacity packaging line, using the 982 N push force to redirect heavy cartons smoothly.
Small Press Ejection
Pushes stamped metal parts out of a compact die set, where the shorter JIS profile saves critical bed length.
Clamp Actuation
Secures aluminum extrusions during a cutting operation, applying reliable holding pressure without needing continuous sensor feedback.
Is the Airtac JSI Series Standard Cylinder JSI50X55 the Right Cylinder?
When sizing this 50 mm bore, stepping down to a 40 mm unit drops the 0.5 MPa push force to 628 N, whereas moving up to a 63 mm bore raises it to 1559 N. For this 55 mm stroke, side-load risks are minimal, but always align the rod end carefully. Mounting options include LB foot brackets, FA/FB flanges, CA/CB clevises, and TC trunnions, plus I, Y, F, or U rod knuckles. Since this SKU has no magnet, you must select the -S version if your application requires CMSE or DMSE sensors.
Keep in mind that a standard double-acting cylinder like this will drift if air pressure is lost or the valve is centered. The end-of-stroke cushions only decelerate the piston; they do not act as a brake. If your assembly must hold a vertical load securely during an air loss event, install an external rod lock or a pilot-operated check valve.
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 JSI50X55 FAQ
The 50 mm bore provides 982 N push and 825 N pull at 0.5 MPa, increasing to 1374 N push and 1154 N pull at 0.7 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa. It uses a G1/4 air port and operates at speeds between 30 and 800 mm/s.
No, this specific SKU does not include the -S magnet, so it cannot accept CMSE or DMSE switches. You must specify the -S variant to enable drop-in sensors via the side grooves. The profile is also a JIS-standard design that is shorter and more compact than a comparable ISO 15552 cylinder.
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