Airtac JSI Series Standard Cylinder JSI125X900
The AirTAC Airtac JSI Series Standard Cylinder JSI125X900 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 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 JSI125X900
Delivering massive thrust for heavy machinery, 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 aluminium barrel, it is explicitly shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore, saving valuable machine space. The internal two-way piston seal retains grease for a long, low-friction service life.
Operating at 30-500 mm/s, the unit features a 32 mm carbon steel rod, M27x2.0 rod-end thread, and a G1/2 air port. 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 lacks the -S magnet, it cannot host CMSE or DMSE position switches; specify the -S variant if you need drop-in side-groove sensing.
Airtac JSI Series Standard Cylinder JSI125X900 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X900 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 JSI125X900
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×900 | 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 JSI125X900 Is Used
Press Ejection
Provides the robust 6136 N push force needed to eject heavy stamped metal parts from a 400-ton hydraulic press bed over a long 900 mm clearance distance.
Pallet Dispenser
Cycles stacked wooden pallets out of a magazine feeder, using the extended 900 mm stroke to reach the bottom of the stack without requiring secondary linkages.
Heavy Door Actuation
Opens large industrial paint-booth doors, where the compact JIS profile saves axial length on the wall mounting bracket while moving the heavy insulated panels.
Is the Airtac JSI Series Standard Cylinder JSI125X900 the Right Cylinder?
When sizing this 125 mm bore, stepping down to the 100 mm bore drops the 0.5 MPa push force to 3927 N, while 125 mm is the largest available JSI size, so exceeding this capacity requires a different cylinder family entirely. For this 900 mm stroke, external guide rails are strongly recommended to prevent rod bending and premature seal wear under side loads.
Remember that the adjustable 33 mm air cushions only decelerate the piston near the end of travel; they do not act as a brake. If the machine loses air or the valve is centred, the load will drift, so fit an external rod lock or pilot-operated check valve to hold position securely.
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 JSI125X900 FAQ
The 125 mm bore yields a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa, 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, a 32 mm rod, and an M27x2.0 rod-end thread.
No, this specific SKU does not include a magnet, so CMSE or DMSE switches cannot be used. You must order the -S variant to enable drop-in sensors in the side grooves. Additionally, while its JIS profile is shorter than an ISO 15552 cylinder of the same bore, it is not dimensionally interchangeable with ISO 15552.
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 JSI125X900
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.