Airtac JSI Series Standard Cylinder JSI125X120
The AirTAC Airtac JSI Series Standard Cylinder JSI125X120 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 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 JSI125X120
Delivering massive thrust for heavy-duty automation, this double-acting JIS-standard profile cylinder pushes with 6136 N and pulls with 5734 N at 0.5 MPa. Built with an extruded hard-anodized aluminum barrel, it is deliberately shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore, saving valuable machine space without sacrificing power.
The bore dictates a G1/2 port and an M27x2.0 rod thread, while a two-way piston seal retains grease for a long, low-friction service life. For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which means it safely lifts roughly 313 kg vertically with a 2:1 margin. Note that this specific SKU lacks the -S magnet, so it cannot host CMSE or DMSE position switches.
Airtac JSI Series Standard Cylinder JSI125X120 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X120 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 JSI125X120
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×120 | 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 JSI125X120 Is Used
Heavy Stamping Press
Drives the heavy tooling bed in an automotive stamping press, utilizing the full 6136 N push force to form thick steel blanks reliably.
Pallet Dispenser
Pushes empty wooden pallets into the high-speed packaging line, where the 313 kg safe vertical lift capacity easily manages the heavy stack weight.
Injection Mold Ejection
Actuates the primary ejection plate on a large plastic injection molding machine, requiring the robust 125 mm bore to break the vacuum of large parts.
Is the Airtac JSI Series Standard Cylinder JSI125X120 the Right Cylinder?
When sizing this 125 mm bore, the next size down is the 100 mm option offering 3927 N of push force at 0.5 MPa, while this 125 mm unit maxes out the JSI range at 6136 N with no larger standard bore available. Since this is a non-magnetized model, you must select an -S variant if your application requires drop-in side-groove sensing.
Remember that a standard air cylinder cannot hold a load if air pressure drops or the valve is centered; the piston will drift, as the end cushions only decelerate motion near stroke limits rather than acting as a brake. For suspended or vertical loads, integrate an external rod lock or a pilot-operated check valve to prevent falling.
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 JSI125X120 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 is 1251 kgf at 1.0 MPa.
The JSI is a JIS-standard profile cylinder that is noticeably shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. It uses an extruded hard-anodized aluminum barrel without external rods to achieve this space-saving footprint while retaining heavy-duty performance.
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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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