Airtac JSI Series Standard Cylinder JSI125X100STC
The AirTAC Airtac JSI Series Standard Cylinder JSI125X100STC is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 100mm 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
- Stroke100 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 JSI125X100STC
Delivering 6136 N of push force at 0.5 MPa, this double-acting 125 mm bore cylinder handles heavy-duty automation with ease. As a JIS-standard profile unit, it features an extruded hard-anodized aluminum barrel and is notably shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space. The internal two-way piston seal retains grease for long, low-friction life, while the G1/2 port manages the high air volume this bore requires.
Because the model code includes an S, a built-in piston magnet is present, allowing CMSE or DMSE switches to drop directly into the side grooves for position sensing. For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which means it lifts roughly 313 kg vertically with a 2:1 safety margin. The 100 mm stroke operates at 30-500 mm/s, and the adjustable 33 mm air cushions at both ends decelerate the heavy payload smoothly at stroke end.
Airtac JSI Series Standard Cylinder JSI125X100STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X100STC |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 JSI125X100STC
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×100 | 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 JSI125X100STC Is Used
Injection Mold Clamping
Provides the 6136 N push force at 0.5 MPa needed to secure heavy injection mold halves, utilizing the compact JIS profile to fit tight press enclosures.
Palletized Load Shifting
Lifts roughly 313 kg vertically with a 2:1 margin, making it suitable for repositioning dense palletized goods within automated high-bay racking systems.
Stamping Press Feed
Drives heavy gauge material feeds into large stamping presses, where the 33 mm adjustable air cushions absorb the kinetic energy of the 125 mm piston at stroke end.
Is the Airtac JSI Series Standard Cylinder JSI125X100STC the Right Cylinder?
When sizing this 125 mm bore unit, the next size down is the 100 mm bore, which provides 3927 N of push force at 0.5 MPa. Since 125 mm is the largest available JSI bore, moving up in force requires a different cylinder family. The included TC trunnion mount provides a pivot point at the body centerline, ideal for articulated mechanisms. If your application must hold a vertical load during air loss or valve centering, add an external rod lock or pilot-operated check valve, as the standard air cushion only decelerates the piston and will not prevent drift.
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 JSI125X100STC FAQ
This 125 mm bore model uses a G1/2 port and an M27x2.0 rod thread. The thrust outputs are 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.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. The S denotes a built-in piston magnet for CMSE/DMSE sensors, and TC specifies a trunnion mount for pivoting applications.
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Standard models are processed and dispatched in 3-5 business days.
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