Airtac JSI Series Standard Cylinder JSI125X250CA
The AirTAC Airtac JSI Series Standard Cylinder JSI125X250CA is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 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 JSI125X250CA
Delivering massive thrust for heavy industrial tasks, the AirTAC JSI125X250CA provides 6136 N of push force at 0.5 MPa. This double-acting JIS-standard profile cylinder uses an extruded hard-anodized aluminum barrel, making it significantly shorter and more compact than an ISO 15552 cylinder of the same bore to save valuable machine space. Its heterogeneous two-way piston seal retains grease for long, low-friction life.
With a 125 mm bore, 250 mm stroke, and a G1/2 port, it generates a safe working load of about 3682 N for real work, lifting roughly 313 kg vertically with a 2:1 safety margin. The CA clevis mount accommodates pivoting loads. Because this SKU lacks the -S magnet, it cannot accept CMSE or DMSE position switches; order the -S variant if sensing is required.
Airtac JSI Series Standard Cylinder JSI125X250CA Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X250CA |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 JSI125X250CA
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×250 | 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 JSI125X250CA Is Used
Heavy Stamp Presses
Drives large metal forming dies requiring 6136 N of push force at 0.5 MPa to shape thick steel plates.
Pallet Lifting Arms
Actuates robust pivoting arms using the CA clevis to lift approximately 313 kg palletized materials vertically.
Injection Molding Ejection
Ejects dense plastic automotive parts from molds, relying on the 5734 N pull force at 0.5 MPa for safe retraction.
Is the Airtac JSI Series Standard Cylinder JSI125X250CA the Right Cylinder?
When sizing this 125 mm bore model, verify if the 6136 N push at 0.5 MPa fits your application. If less force is needed, the next size down is the 100 mm bore offering 3927 N; since 125 mm is the largest available JSI, exceeding this capacity requires a different approach. The CA clevis mount is ideal for articulating mechanisms.
This standard cylinder does not hold its load if air pressure drops or the valve is centered—the piston will drift, as the adjustable air cushions only decelerate movement near stroke ends. For suspended or vertical loads, install an external rod lock or a pilot-operated check valve. At 250 mm stroke, side-load risks are moderate, but always ensure the rod end is guided to prevent bending.
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 JSI125X250CA FAQ
This 125 mm bore cylinder features a G1/2 port and an M27x2.0 rod thread. It delivers 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 operating speed is 30-500 mm/s.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. It achieves this via an extruded hard-anodized aluminum barrel without external rods, saving footprint while maintaining heavy-duty performance.
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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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