Airtac JSI Series Standard Cylinder JSI125X80S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X80S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 80mm 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
- Stroke80 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 JSI125X80S
Generating 6136 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder brings heavy-duty actuation to tight machine layouts. Its extruded hard-anodized aluminum barrel omits external rods entirely, making the unit shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The internal two-way piston seal retains grease for a long, low-friction service life.
Because this SKU includes the -S magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side sensor grooves for position detection. Plan for roughly 3682 N of real work at 0.5 MPa, which translates to lifting about 313 kg vertically with a 2:1 safety margin. The unit features G1/2 ports, an M27x2.0 rod thread, and adjustable air cushions at both ends to decelerate the payload smoothly.
Airtac JSI Series Standard Cylinder JSI125X80S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X80S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 80 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 JSI125X80S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×80 | 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 JSI125X80S Is Used
Stamping Press Feed
Drives heavy billet pushers into a mechanical press, utilizing the 6136 N push force to shift large steel blanks into the die bed.
Pallet Dispenser
Actuates a 300 kg loaded pallet magazine mechanism, where the 313 kg vertical lift capacity with a 2:1 margin handles stack indexing reliably.
Injection Mold Eject
Strips dense molded plastic parts from a large injection press tool, relying on the 33 mm adjustable air cushions to prevent end-of-stroke impact damage.
Is the Airtac JSI Series Standard Cylinder JSI125X80S the Right Cylinder?
When sizing this 125 mm bore, the next size down is the 100 mm option (3927 N push at 0.5 MPa), while there is no larger standard JSI bore above it. If your application requires holding a vertical load when air is lost or the valve is centered, remember that a plain cylinder will drift; the end cushions only decelerate the piston near stroke end and do not act as a brake. You must add an external rod lock or a pilot-operated check valve for secure load holding. The built-in -S magnet pairs perfectly with CMSE or DMSE sensors for mid-stroke positioning feedback.
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 JSI125X80S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa it provides 8590 N push and 8028 N pull. The theoretical maximum force is 1251 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-500 mm/s, and it uses G1/2 ports with an M27x2.0 rod thread.
It is a JIS-standard profile cylinder featuring an extruded hard-anodized aluminum barrel without external rods, making it shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. This space-saving footprint is ideal for dense machinery 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.
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Most inquiries answered within 7-8 hours.
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