Airtac JSI Series Standard Cylinder JSI125X800
The AirTAC Airtac JSI Series Standard Cylinder JSI125X800 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 JSI125X800
Delivering massive thrust in a space-saving package, this double-acting JIS-standard profile cylinder exerts 6136 N of push force at 0.5 MPa. Its extruded hard-anodized aluminum barrel omits external rods, making it shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The internal two-way piston seal retains grease for long, low-friction service life.
With an 800 mm stroke, plan for about 3682 N of real work at 0.5 MPa, which lifts roughly 313 kg vertically with a 2:1 safety margin. The G1/2 air port feeds the 32 mm piston rod, and adjustable 33 mm air cushions decelerate the piston at both ends. Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position sensors.
Airtac JSI Series Standard Cylinder JSI125X800 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X800 |
|---|---|
| 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 JSI125X800
| 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 JSI125X800 Is Used
Automotive Body Press
Provides the 8590 N push force at 0.7 MPa needed to clamp heavy stamping dies securely over the long 800 mm travel.
Palletizing Robot Arm
Extends fully to lift and position loaded pallets weighing up to 313 kg vertically with a safe 2:1 working margin.
Heavy Lumber Sorting
Pushes large timber bundles across transfer lines, utilizing the 33 mm adjustable cushions to stop the massive load smoothly.
Is the Airtac JSI Series Standard Cylinder JSI125X800 the Right Cylinder?
When sizing this 125 mm bore, stepping down to a 100 mm bore drops the output to 3927 N push at 0.5 MPa, while 125 mm is the largest available JSI size. For the lengthy 800 mm stroke, you must support the load with external guides to prevent rod bending and premature seal wear from side loads.
Remember that air cushions only decelerate the piston near the end of travel; they do not act as a brake. If the air supply drops or the valve is centered, the piston will drift, so fit an external rod lock or pilot-operated check valve to hold a suspended load safely.
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 JSI125X800 FAQ
This 125 mm bore cylinder features a G1/2 air port and an M27x2.0 rod thread. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa.
The JSI is a JIS-standard cylinder built with an extruded aluminum profile instead of external rods, making it shorter and more compact than an ISO 15552 cylinder of the same bore. This space-saving design is ideal for tight machine layouts.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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