Airtac JSI Series Standard Cylinder JSI125X70
The AirTAC Airtac JSI Series Standard Cylinder JSI125X70 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 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 JSI125X70
Delivering 6136 N of push force at 0.5 MPa, the AirTAC JSI125X70 is a heavy-duty double-acting JIS-standard profile cylinder built for tight machinery layouts. Its extruded hard-anodized aluminum barrel omits external rods, making the overall body shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The design incorporates a heterogeneous two-way piston seal that retains grease for extended, low-friction service life.
Because this specific SKU lacks the -S magnet suffix, it cannot accept CMSE or DMSE position switches. For sizing real-world tasks, plan for about 3682 N of actual work at 0.5 MPa, which translates to lifting roughly 313 kg vertically with a 2:1 safety margin. The unit features a G1/2 port, an M27x2.0 rod thread, and adjustable air cushions at both ends to decelerate the payload smoothly.
Airtac JSI Series Standard Cylinder JSI125X70 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X70 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 JSI125X70
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×70 | 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 JSI125X70 Is Used
Stamping Press Feeders
Provides the robust 6136 N push force needed to clamp and feed heavy sheet metal stock into progressive stamping dies.
Injection Mold Ejection
Drives heavy mold ejection plates where the 313 kg vertical lift capacity easily clears large molded components from the cavity.
Pallet Stopper Gates
Acts as a high-force diverter gate in automated pallet conveyors, halting loads weighing up to half a ton safely.
Is the Airtac JSI Series Standard Cylinder JSI125X70 the Right Cylinder?
When sizing this 125 mm bore, the next size down is the 100 mm option offering 3927 N push at 0.5 MPa, while there is no larger bore in the JSI range. If your application requires position feedback, you must select the -S magnet variant instead of this base model, as a plain cylinder cannot host sensors. For vertical or suspended loads, remember that exhausting the air or centering the valve will cause the piston to drift; an external rod lock or pilot-operated check valve is required to hold the load, as the cushions only decelerate near stroke end.
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 JSI125X70 FAQ
The JSI125X70 delivers 6136 N push and 5734 N pull at 0.5 MPa, or 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa. It uses a G1/2 air port and operates at speeds between 30-500 mm/s.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. Note that because this specific SKU lacks the -S magnet, it cannot support CMSE or DMSE magnetic sensors.
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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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