Airtac JSI Series Standard Cylinder JSI125X225
The AirTAC Airtac JSI Series Standard Cylinder JSI125X225 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 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 JSI125X225
Generating 6136 N of push force at 0.5 MPa, this double-acting 125 mm bore JIS-standard profile cylinder is built for heavy-duty machinery. Its extruded hard-anodized aluminum barrel omits external rods, making it shorter and more compact than an equivalent ISO 15552 cylinder. The internal two-way piston seal retains grease for low-friction longevity, and adjustable 33 mm air cushions at both ends absorb shock.
At 0.5 MPa, plan for roughly 3682 N of actual work output, which translates to lifting about 313 kg vertically with a 2:1 safety margin. Because this specific SKU lacks the -S magnet option, it cannot accept CMSE or DMSE position sensors. Air connections use a G1/2 port, and the 32 mm carbon steel rod features an M27x2.0 thread.
Airtac JSI Series Standard Cylinder JSI125X225 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X225 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 JSI125X225
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×225 | 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 JSI125X225 Is Used
Stamping Press Ejection
Uses the 6136 N push force at 0.5 MPa to knock heavy stamped metal panels out of a 200-ton press bed safely.
Pallet Dispenser Pusher
Indexes empty wooden pallets into a high-speed packaging line, utilizing the 225 mm stroke to clear the magazine.
Injection Mold Separation
Pries apart large 125 mm mold halves on heavy plastics machinery where a shorter footprint saves valuable floor space.
Is the Airtac JSI Series Standard Cylinder JSI125X225 the Right Cylinder?
As the largest bore in the JSI series, there is no larger standard size to step up to; if 6136 N at 0.5 MPa is insufficient, you must add external pressure or parallel cylinders. Stepping down to a 100 mm bore drops the output to 3927 N push at 0.5 MPa. The 225 mm stroke is well within the 1500 mm maximum standard stroke limit and operates at 30-500 mm/s.
This base model cannot hold a suspended load if air pressure drops or the valve is centered, as the piston will drift and the cushions only decelerate near stroke end. Install an external rod lock or pilot-operated check valve for secure vertical holding. 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.
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 JSI125X225 FAQ
The JSI125X225 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. The theoretical maximum force is 1251 kgf at 1.0 MPa. It uses a G1/2 air port.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. Note that this SKU lacks the -S magnet, so it cannot use CMSE or DMSE sensors.
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 JSI125X225
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.