Airtac JSI Series Standard Cylinder JSI125X85TC
The AirTAC Airtac JSI Series Standard Cylinder JSI125X85TC is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 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 JSI125X85TC
Delivering 6136 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder is built for heavy-duty automation. Its extruded hard-anodized aluminum barrel omits external rods, making the unit noticeably shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The internal two-way piston seal retains grease, ensuring long, low-friction life even under high cycling loads.
For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which safely lifts about 313 kg vertically with a 2:1 margin. The unit features a G1/2 port, an M27x2.0 rod thread, and 33 mm adjustable air cushions at both ends to decelerate the payload smoothly. Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position sensors.
Airtac JSI Series Standard Cylinder JSI125X85TC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X85TC |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 JSI125X85TC
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×85 | 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 JSI125X85TC Is Used
Stamping Press Feed
Pushes heavy coil stock into a mechanical stamping press, utilizing the 6136 N push force to overcome material friction and guide resistance.
Pallet Dispenser
Separates empty wooden pallets at the bottom of a magazine stack, using the robust 5734 N pull force to drag the lowest pallet sideways onto a conveyor.
Injection Mold Clamp
Provides secondary clamping pressure on large injection molding tools, taking advantage of the compact JIS profile to fit within tight machine guarding.
Is the Airtac JSI Series Standard Cylinder JSI125X85TC the Right Cylinder?
When sizing this 125 mm bore, the next size down is the 100 mm option yielding 3927 N at 0.5 MPa, while the 125 mm bore itself represents the upper limit of the JSI range with a maximum theoretical output of 1251 kgf at 1.0 MPa. The TC trunnion mount specified here is ideal for pivoting applications, but ensure your mechanical structure handles the 85 mm stroke without binding. Since this SKU has no -S suffix, adding a magnet is required if you later need CMSE or DMSE switches for end-of-stroke detection.
Remember that a standard pneumatic cylinder cannot hold a load vertically if air pressure drops or the valve is centered, as the piston will drift. The integrated cushions only decelerate the rod near the stroke ends and do not act as a mechanical brake. To secure a suspended load safely, install an external rod lock or a pilot-operated check valve in the air circuit.
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 JSI125X85TC FAQ
This 125 mm bore cylinder uses a G1/2 port and an M27x2.0 rod thread. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. It does not hold position on air loss; the cushions only decelerate the piston, so you need an external rod lock for suspended loads.
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Standard models are processed and dispatched in 3-5 business days.
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