Airtac JSI Series Standard Cylinder JSI125X150
The AirTAC Airtac JSI Series Standard Cylinder JSI125X150 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 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 JSI125X150
Delivering massive thrust in a tight footprint, this double-acting JIS-standard profile cylinder is notably shorter and more compact than a same-bore ISO 15552 unit. The 125 mm bore generates 6136 N of push force at 0.5 MPa, making it ideal for heavy-duty machinery where space is at a premium. The extruded hard-anodized aluminum barrel sheds weight while resisting wear, and a 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 safely lifts roughly 313 kg vertically with a 2:1 margin. The unit features a 32 mm rod, M27x2.0 rod-end thread, and G1/2 ports. Because this SKU lacks the -S magnet, it cannot accept CMSE or DMSE position sensors; specify the -S variant if you need drop-in side-groove sensing.
Airtac JSI Series Standard Cylinder JSI125X150 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X150 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 JSI125X150
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×150 | 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 JSI125X150 Is Used
Heavy Stamping Press
Provides the intense clamping force required to hold thick steel plates securely inside an automotive stamping die before the upper tool descends.
Injection Mold Ejection
Drives large knockout pins on a heavy plastic molding machine, using its 6136 N push force to break bulky parts free from deep mold cavities.
Pallet Squaring Gate
Acts as a heavy-duty alignment stop on a high-speed packaging line, squaring up loaded pallets before they enter the stretch wrap station.
Is the Airtac JSI Series Standard Cylinder JSI125X150 the Right Cylinder?
As the largest bore in the JSI range, there is no larger standard size to step up to if you need more power. If your application is over-specified, stepping down to the 100 mm bore drops the output to 3927 N push at 0.5 MPa. This 150 mm stroke is well within standard limits and requires no special side-load guidance. For mounting flexibility, choose LB foot, FA/FB flange, CA/CB/CR clevis, TC/TCM1/TCM2 trunnion, or an I/Y/F/U rod knuckle.
Keep in mind that a standard double-acting cylinder will drift if air pressure drops or the valve is centered, as the adjustable 33 mm air cushions only decelerate the piston near stroke end rather than locking it. To maintain vertical load position during an air loss event, incorporate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
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 JSI125X150 FAQ
The 125 mm bore yields a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa, push is 8590 N and pull is 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. It uses G1/2 ports, a 32 mm rod, and operates at speeds of 30-500 mm/s.
No, this specific SKU does not include a magnet, so CMSE or DMSE switches cannot be used. You must select the JSI125X150-S variant to enable drop-in magnetic sensing via the side grooves. The extruded profile design is also shorter than a standard ISO 15552 cylinder of the same bore.
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