Airtac JSI Series Standard Cylinder JSI125X25
The AirTAC Airtac JSI Series Standard Cylinder JSI125X25 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 25mm 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
- Stroke25 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 JSI125X25
Delivering massive thrust in a tight footprint, this double-acting JIS-standard profile cylinder generates 6136 N of push force at 0.5 MPa. Because it uses an extruded hard-anodized aluminum barrel without external rods, the overall body is noticeably shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore, saving valuable machine space.
The bore dictates a G1/2 port and an M27x2.0 rod thread, moving the piston at 30-500 mm/s. A heterogeneous two-way piston seal retains grease for long, low-friction life. For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which lifts roughly 313 kg vertically with a 2:1 margin. Note this specific SKU lacks the -S magnet, so it cannot accept CMSE or DMSE position switches.
Airtac JSI Series Standard Cylinder JSI125X25 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X25 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 JSI125X25
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×25 | 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 JSI125X25 Is Used
Heavy Stamping Press
Provides the intense 6136 N clamping force needed to hold thick steel plates firmly in place during a heavy-duty stamping operation.
Injection Mold Locking
Generates massive thrust to secure large heavy industrial injection molding halves together securely against high internal cavity pressures.
Pallet Squarer
Delivers raw power to push heavy loaded pallets squarely against a rigid guide rail before automated banding and stretch wrapping.
Is the Airtac JSI Series Standard Cylinder JSI125X25 the Right Cylinder?
As the largest bore in the JSI series, there is no larger standard size to step up to if you need more power. If your application is lighter, stepping down to the JSI100X25 provides 3927 N of push at 0.5 MPa, which might suffice and saves space. This 25 mm stroke keeps the rod short, minimizing side-load bending concerns. Remember that a standard cylinder drifts when air is lost or the valve is centered; the adjustable 33 mm air cushions only decelerate the piston near the ends, so install an external rod lock or pilot-operated check valve if you must hold a load safely mid-stroke.
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 JSI125X25 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa it yields 8590 N push and 8028 N pull. The theoretical maximum force is 1251 kgf at 1.0 MPa. The air port is G1/2.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. It uses a hard-anodized aluminum extruded barrel instead of external rods to save space.
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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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