Airtac JSI Series Standard Cylinder JSI125X800S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X800S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 800mm stroke, G1/2 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.
- BoreØ125 mm
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- CushionAdjustable, 33 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 JSI125X800S
Delivering 6136 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder handles the heaviest automation tasks while occupying a shorter envelope than an equivalent ISO 15552 unit. The 125 mm bore generates 8590 N at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa. Its 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 provides a built-in piston magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing.
At 0.5 MPa you can plan for about 3682 N of real work, which means it lifts roughly 313 kg vertically with a 2:1 safety margin. The G1/2 port and M27x2.0 rod thread match the bore's heavy-duty flow and mounting requirements. Operating between 0.15 and 1.0 MPa at speeds of 30-500 mm/s, the adjustable 33 mm air cushions at both ends decelerate the massive payload smoothly at stroke ends.
Airtac JSI Series Standard Cylinder JSI125X800S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X800S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 33 mm |
| Max standard stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 JSI125X800S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×800 | 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 JSI125X800S Is Used
Palletizer Elevator
Raises 300 kg layer-forming platforms in end-of-line packaging machinery, utilizing the 6136 N push force and 800 mm travel to stack full pallet heights.
Injection Mold Ejector
Pushes heavy molded automotive interior panels out of large presses, relying on the 33 mm adjustable air cushions to stop the 125 mm piston smoothly.
Automated Storage Crane
Drives the vertical Z-axis shuttle in high-bay AS/RS systems, where the -S magnet triggers DMSE sensors to confirm tote retrieval positions over 800 mm.
Is the Airtac JSI Series Standard Cylinder JSI125X800S the Right Cylinder?
When sizing this class of actuator, the neighboring JSI100 offers 3927 N of push at 0.5 MPa if you need a lighter footprint, while the 125 mm bore shown here is the maximum available in the series. For this 800 mm stroke, you must support the load with external guides to prevent rod bending and excessive side loading. Because a standard cylinder drifts when air is lost or the valve is centered, install an external rod lock or a pilot-operated check valve to hold a suspended load safely. The included magnet pairs perfectly with CMSE/DMSE sensors, and you can mount the body using LB foot, FA/FB flange, CA/CB/CR clevis, or TC/TCM1/TCM2 trunnion brackets.
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 JSI125X800S FAQ
At 0.5 MPa this 125 mm bore cylinder pushes 6136 N and pulls 5734 N. At 0.7 MPa it pushes 8590 N and pulls 8028 N, with a theoretical maximum of 1251 kgf at 1.0 MPa. The air port is G1/2, the rod thread is M27x2.0, and the speed range is 30-500 mm/s.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore, saving valuable machine space. It uses an extruded hard-anodized aluminum barrel with no external rods. The -S magnet on this SKU allows CMSE or DMSE switches to be fitted into the side grooves for position feedback.
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