Airtac JSI Series Standard Cylinder JSI125X90S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X90S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 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 JSI125X90S
Delivering massive thrust in a tight footprint, this double-acting JIS-standard profile cylinder is notably shorter and more compact than an ISO 15552 unit of the same 125 mm bore. The hard-anodized aluminum extrusion omits external rods entirely, resisting wear while the two-way NBR piston seal retains grease for a long, low-friction service life. It pushes with 6136 N and pulls with 5734 N at 0.5 MPa.
Because the -S suffix equips the piston with a magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing. In real-world use, plan for about 3682 N of actual work at 0.5 MPa, which means it lifts roughly 313 kg vertically with a 2:1 safety margin. The G1/2 port and M27x2.0 rod thread handle the high volume needed for its 30-500 mm/s speed range.
Airtac JSI Series Standard Cylinder JSI125X90S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X90S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 JSI125X90S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×90 | 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 JSI125X90S Is Used
Injection Mold Clamping
Provides the heavy 6136 N push force needed to secure large injection mold halves, utilizing the compact JIS profile to fit within tight press frameworks.
Pallet Stopper Gate
Acts as a robust 90 mm stroke barrier on high-speed pallet conveyors, easily halting loads up to 313 kg vertically with its built-in -S magnet for timing confirmation.
Stamping Press Feed
Drives heavy metal blanks into stamping presses, where the hard-anodized barrel withstands industrial debris and the 30-500 mm/s speed ensures rapid cycle times.
Is the Airtac JSI Series Standard Cylinder JSI125X90S the Right Cylinder?
Sizing this bore requires looking both ways: if 6136 N of push at 0.5 MPa is excessive, the next size down is the 100 mm bore delivering 3927 N; if you need more, the 125 mm is the largest available in the JSI range. For this 90 mm stroke, side-load and rod-bending stresses are minimal, so standard LB foot or TC trunnion mounts will perform flawlessly. If your machine layout requires a double rod or adjustable stroke, consider the related JSID or JSIJ types.
Remember that the adjustable 33 mm air cushions at both ends only decelerate the piston near the stroke limits to prevent end-cap impact. They do not function 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 drifting.
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 JSI125X90S FAQ
At 0.5 MPa it pushes with 6136 N and pulls with 5734 N. At 0.7 MPa the push is 8590 N and pull is 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. It uses a G1/2 air port and features a 32 mm rod with an M27x2.0 thread.
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, saving valuable machine space. It uses an extruded aluminum barrel without external rods, and the included -S magnet allows CMSE or DMSE sensors to slot directly into the side grooves.
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