Airtac JSI Series Standard Cylinder JSI125X125
The AirTAC Airtac JSI Series Standard Cylinder JSI125X125 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 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 JSI125X125
Delivering 6136 N of push force at 0.5 MPa, this double-acting 125 mm bore actuator handles heavy-duty automation with ease. Built to JIS standards, its extruded hard-anodized aluminum profile is purposefully shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space. The two-way piston seal retains grease for a long, low-friction service life.
Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position switches. For real-world sizing, plan for roughly 3682 N of actual work at 0.5 MPa, which translates to lifting about 313 kg vertically with a 2:1 safety margin. The unit features a G1/2 air port, an M27x2.0 rod thread, and 33 mm adjustable air cushions at both ends to decelerate the payload smoothly.
Airtac JSI Series Standard Cylinder JSI125X125 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X125 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 JSI125X125
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×125 | 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 JSI125X125 Is Used
Injection Mold Clamping
Provides the heavy 6136 N push force needed to secure large injection mold halves or heavy industrial platens during a forming cycle.
Pallet Positioning
Shifts loaded pallets weighing up to 313 kg vertically or horizontally on packaging lines, utilizing the compact JIS profile to fit tight conveyor frames.
Press Ejection Systems
Ejects dense finished metal or composite parts from heavy hydraulic presses, relying on the 33 mm cushions to absorb impact at stroke end.
Is the Airtac JSI Series Standard Cylinder JSI125X125 the Right Cylinder?
When sizing this 125 mm bore actuator, stepping down to the JSI100 yields 3927 N of push force at 0.5 MPa, while no larger JSI bore exists above this class. The 125 mm stroke keeps the rod short enough to avoid bending concerns, but any future upgrade to strokes of 300 mm or more will require external guide rails to prevent side-load damage. Choose the -S magnet variant if you need drop-in CMSE or DMSE sensors for end-of-stroke detection.
Remember that standard air cushions only decelerate the piston near the end caps and never act as a brake. If your application must hold a vertical load when air pressure drops or the valve is centered, you must add an external rod lock or a pilot-operated check valve to prevent drift.
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 JSI125X125 FAQ
This 125 mm bore cylinder uses a G1/2 air port and an M27x2.0 rod thread. It generates 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. Operating speed ranges from 30-500 mm/s.
No, this specific SKU does not include a magnet. You must select the JSI125X125-S variant to use CMSE or DMSE magnetic switches in the side sensor grooves. Additionally, the JIS profile body is shorter and more compact than an ISO 15552 cylinder of the same bore.
Authorized Export Seller
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.
Related AirTAC JSI Cylinders
Request a Quote for Airtac JSI Series Standard Cylinder JSI125X125
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.