Airtac JSI Series Standard Cylinder JSI125X150S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X150S 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 JSI125X150S
Delivering 6136 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder is built for heavy-duty automation. Its extruded hard-anodized aluminum barrel omits external rods, making the unit shorter and more compact than an equivalent ISO 15552 model of the same 125 mm bore. The integrated -S piston magnet allows CMSE or DMSE switches to drop directly into the side grooves for precise position detection.
A heterogeneous two-way piston seal retains grease for a long, low-friction service life. 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 G1/2 port and M27x2.0 rod thread handle high flow rates, while the 33 mm adjustable air cushions at both ends decelerate massive loads smoothly.
Airtac JSI Series Standard Cylinder JSI125X150S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X150S |
|---|---|
| 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 JSI125X150S
| 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 JSI125X150S Is Used
Heavy Stamping Press Feed
Pushes thick steel blanks into a forming press, using the 6136 N push force to overcome high material friction and seat the part accurately.
Pallet Dispenser Magazine
Lifts empty wooden pallets from a stacked magazine, easily handling the 313 kg vertical load capacity within the 150 mm stroke.
Injection Mold Ejection
Ejects dense plastic automotive bumpers from a large mold cavity, relying on the 33 mm adjustable cushions to prevent impact damage at stroke end.
Is the Airtac JSI Series Standard Cylinder JSI125X150S the Right Cylinder?
As the largest bore in the JSI series, there is no larger standard size to step up to; if 6136 N is insufficient, you must add external pneumatic boosters or parallel cylinders. Stepping down, the 100 mm bore provides 3927 N of push force at 0.5 MPa, offering a lighter 801 kgf maximum theoretical output if your 1251 kgf maximum is overkill. The 150 mm stroke is well within the 1500 mm standard limit, so no side-load concerns apply here.
Because this is a double-acting cylinder, air drives the piston in both directions. Note that the end cushions only decelerate the stroke; they do not act as a brake. If the machine loses air, the piston will drift, so install an external rod lock or pilot-operated check valve to hold suspended loads safely.
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 JSI125X150S FAQ
This 125 mm bore cylinder features a G1/2 port and an M27x2.0 rod thread. The thrust output is 6136 N push and 5734 N pull at 0.5 MPa, increasing to 8590 N push and 8028 N pull at 0.7 MPa. The theoretical maximum force at 1.0 MPa is 1251 kgf.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space. The included -S magnet allows CMSE and DMSE switches to mount directly into the side barrel grooves for position sensing.
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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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