Airtac JSI Series Standard Cylinder JSI125X210
The AirTAC Airtac JSI Series Standard Cylinder JSI125X210 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 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 JSI125X210
Delivering massive thrust in a tight footprint, this double-acting JIS-standard profile cylinder pushes with 6136 N and pulls with 5734 N at 0.5 MPa. Because the JSI125X210 uses an extruded hard-anodized aluminum barrel instead of external rods, it is significantly shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The internal two-way piston seal retains grease exceptionally well, ensuring low-friction operation over long service hours on heavy machinery.
With a 210 mm stroke and a 32 mm rod, it operates at 30-500 mm/s via a G1/2 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. Note that this specific SKU lacks the -S magnet, meaning it cannot host CMSE or DMSE position switches without upgrading to the magnet-equipped variant.
Airtac JSI Series Standard Cylinder JSI125X210 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X210 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 JSI125X210
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×210 | 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 JSI125X210 Is Used
Heavy Press Clamping
Generates 8590 N of push force at 0.7 MPa to secure thick steel plates in an automotive stamping press before the hydraulic ram descends.
Injection Mold Ejection
Provides the robust 5734 N pull force needed to retract heavy mold cores and eject large plastic automotive bumpers from injection molding machines.
Pallet Stopper Gate
Acts as a high-capacity physical stop barrier on heavy-duty roller conveyors, halting loaded 500 kg pallets before the wrapping station.
Is the Airtac JSI Series Standard Cylinder JSI125X210 the Right Cylinder?
Sizing this bore requires looking at both neighbors: dropping down to the 100 mm bore reduces your push force to 3927 N at 0.5 MPa, while there is no larger JSI option beyond 125 mm. If your application demands position feedback, you must select the -S version of this cylinder to enable side-groove CMSE/DMSE sensors. Mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, TC/TCM1/TCM2 trunnion, or an I/Y/F/U rod knuckle.
Remember that a standard pneumatic cylinder cannot hold a load if air pressure drops or the valve is centered—the piston will drift. The adjustable 33 mm air cushions at both ends only decelerate the rod near stroke end; they do not act as a brake. For suspended or gravity-loaded applications, install an external rod lock or a pilot-operated check valve.
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 JSI125X210 FAQ
The JSI125X210 features a G1/2 port and an M27x2.0 rod thread. At 0.5 MPa it pushes with 6136 N and pulls with 5734 N. At 0.7 MPa the push increases to 8590 N and the pull to 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. It uses an extruded aluminum barrel rather than external rods to save space. Note that this non-S SKU cannot accept position sensors; you need the -S variant for CMSE/DMSE switches.
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