Airtac JSI Series Standard Cylinder JSI125X225S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X225S 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 JSI125X225S
Generating 6136 N of push force at 0.5 MPa, this double-acting 125 mm bore JIS-standard profile cylinder handles heavy industrial tasks. Its extruded hard-anodized aluminum barrel omits external rods, making the unit shorter and more compact than an equivalent ISO 15552 cylinder. The internal two-way piston seal retains grease for low-friction operation over a long service life.
Equipped with a G1/2 port and a 32 mm piston rod, the JSI125X225S runs at 30-500 mm/s. Plan for about 3682 N of real work at 0.5 MPa, which safely lifts roughly 313 kg vertically with a 2:1 margin. Because this SKU includes the -S magnet, you can drop CMSE or DMSE sensors directly into the side grooves for position detection.
Airtac JSI Series Standard Cylinder JSI125X225S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X225S |
|---|---|
| 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 JSI125X225S
| 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 JSI125X225S Is Used
Stamping Press Feed
Pushes heavy coil stock into a mechanical stamping press, utilizing the 6136 N push force at 0.5 MPa to overcome material friction.
Injection Mold Clamp
Secures large injection molding tooling halves, taking advantage of the 225 mm stroke and compact profile barrel to fit tight machine frames.
Pallet Stopper Gate
Acts as a heavy-duty stopper gate on automated pallet conveyors, easily halting loads up to 313 kg vertically with a 2:1 safety margin.
Is the Airtac JSI Series Standard Cylinder JSI125X225S the Right Cylinder?
For lighter jobs, the 100 mm bore yields 3927 N push at 0.5 MPa, while the 125 mm is the largest JSI available, offering a theoretical maximum of 1251 kgf at 1.0 MPa. The adjustable 33 mm air cushions at both ends only decelerate the piston near stroke end; they do not act as a brake. If your machine loses air or the valve centers, the load will drift unless you add an external rod lock or a pilot-operated check valve. With a 225 mm stroke, side-load risks are moderate, so ensure rigid guidance to prevent rod bending.
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 JSI125X225S FAQ
This 125 mm bore cylinder features a G1/2 port and generates 6136 N push / 5734 N pull at 0.5 MPa, 8590 N push / 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa.
The extruded hard-anodized aluminum barrel design makes this JIS-standard cylinder shorter and more compact than an ISO 15552 cylinder of the same bore, saving space on machinery. The included -S magnet also allows CMSE or DMSE sensors to fit directly into the side grooves.
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 JSI125X225S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.