Airtac JSI Series Standard Cylinder JSI125X250
The AirTAC Airtac JSI Series Standard Cylinder JSI125X250 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 JSI125X250
Delivering massive thrust in a tight footprint, the AirTAC JSI125X250 is a JIS-standard double-acting profile cylinder that is noticeably shorter and more compact than an ISO 15552 unit of the same 125 mm bore. It pushes with 6136 N and pulls with 5734 N at 0.5 MPa, scaling to a theoretical maximum of 1251 kgf at 1.0 MPa. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while a heterogeneous two-way piston seal retains grease for a long, low-friction service life.
At 0.5 MPa you can plan for roughly 3682 N of actual work output, which translates to lifting about 313 kg vertically with a 2:1 safety margin. Air connects via twin G1/2 ports, and the 32 mm carbon steel rod features an M27x2.0 thread. Because this specific SKU lacks the -S magnet, it cannot host CMSE or DMSE position switches; choose the -S variant if your control system requires drop-in side-groove sensors.
Airtac JSI Series Standard Cylinder JSI125X250 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X250 |
|---|---|
| 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 JSI125X250
| 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 JSI125X250 Is Used
Heavy Press Stamping
Drives large metalforming presses where 6136 N of push force at 0.5 MPa is required to seat heavy dies or bend thick steel plate.
Pallet Handling Stops
Acts as a high-force stopper arm on automated pallet conveyors, absorbing kinetic energy via its 33 mm adjustable air cushions.
Industrial Lift Gates
Raises and lowers substantial material lift gates, safely moving loads up to the 313 kg vertical-lift threshold.
Is the Airtac JSI Series Standard Cylinder JSI125X250 the Right Cylinder?
As the largest bore in the JSI range, there is no larger standard size to step up to if 6136 N at 0.5 MPa is insufficient—you would need to explore twin-cylinder setups or a different series entirely. Stepping down, the 100 mm bore provides 3927 N push at 0.5 MPa, serving as the closest alternative if the 125 mm exceeds your spatial or force requirements. For this 250 mm stroke, standard LB foot, FA/FB flange, CA/CB clevis, or TC trunnion mounts work well without needing auxiliary guides. Note that a standard cylinder drifts when air is lost or a valve is centered, as the adjustable 33 mm cushions only decelerate the piston near stroke ends rather than locking it; install an external rod lock or pilot-operated check valve if the load must be held securely.
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 JSI125X250 FAQ
The JSI125X250 delivers 6136 N push and 5734 N pull at 0.5 MPa, increasing to 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa. It uses G1/2 air ports, features a 32 mm rod with an M27x2.0 thread, and operates at speeds of 30-500 mm/s.
It uses a JIS-standard profile design that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. This specific SKU does not include a magnet, so it cannot accept CMSE or DMSE sensors; you must select the JSI125X250-S variant to enable drop-in side-groove sensing.
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