Airtac JSI Series Standard Cylinder JSI125X650STC
The AirTAC Airtac JSI Series Standard Cylinder JSI125X650STC is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 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 JSI125X650STC
Delivering massive thrust in a tight footprint, the AirTAC JSI125X650STC is a JIS-standard double-acting profile cylinder that is notably shorter and more compact than an ISO 15552 cylinder of the same 125mm bore. It pushes with 6136 N and pulls with 5734 N at 0.5 MPa, featuring a hard-anodized aluminum extruded barrel without external rods. The heterogeneous two-way piston seal retains grease for low-friction life, and the -S suffix means a built-in magnet enables CMSE or DMSE sensors in the side grooves.
For real-world sizing, plan for about 3682 N of actual work at 0.5 MPa, which safely lifts roughly 313 kg vertically with a 2:1 margin. The G1/2 port feeds the 32mm rod, and because this is a 650mm stroke, external guides are recommended to prevent rod bending under side loads. The TC trunnion mount provides a pivoting axis for articulated mechanisms.
Airtac JSI Series Standard Cylinder JSI125X650STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X650STC |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 JSI125X650STC
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×650 | 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 JSI125X650STC Is Used
Heavy Press Ejection
Ejects thick steel stampings from a 400-ton press, utilizing the 6136 N push force at 0.5 MPa to overcome die friction.
Pallet Lift Gate
Raises a loaded 313 kg pallet gate using the 650mm stroke, relying on the TC trunnion to pivot smoothly under load.
Bulk Material Divert
Swings a heavy diverter arm on a mining conveyor, with the hard-anodized barrel resisting abrasive dust ingress.
Is the Airtac JSI Series Standard Cylinder JSI125X650STC the Right Cylinder?
If 6136 N of push at 0.5 MPa is excessive, stepping down to the 100mm bore yields 3927 N; conversely, the 125mm is the largest JSI available, so moving higher requires a different series. This TC trunnion-mounted unit includes the -S magnet for position sensing. Because 650mm is a long stroke, always use an external guide rail to absorb side loads and protect the 32mm rod from bending. Note that standard air cushions only decelerate the piston near the end of travel; they do not lock the rod. If air pressure drops, the load will drift, so fit an external rod lock or pilot-operated check valve for vertical safety.
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 JSI125X650STC FAQ
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa it pushes 8590 N and pulls 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. Operating speed ranges from 30-500 mm/s. It uses a G1/2 port and a 32mm rod with an M27x2.0 thread.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125mm bore. The TC designation indicates a trunnion mount interface. The -S suffix confirms the built-in magnet for CMSE/DMSE switches.
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