Airtac JSI Series Standard Cylinder JSI125X330S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X330S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 330mm 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
- Stroke330 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 JSI125X330S
Delivering 6136 N of push force at 0.5 MPa, the AirTAC JSI125X330S is a heavy-duty double-acting JIS-standard profile cylinder built for large-scale automation. It features an extruded hard-anodized aluminum barrel with no external rods, making it shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. The integrated -S piston magnet allows CMSE and DMSE electronic or reed switches to drop directly into the side grooves for precise end-of-stroke detection.
With a 330 mm stroke and a 32 mm rod, this unit operates at 30-500 mm/s and uses a G1/2 port with an M27x2.0 rod-end thread. The two-way NBR piston seal retains grease for low-friction longevity. For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which safely lifts roughly 313 kg vertically with a 2:1 margin. Adjustable 33 mm air cushions at both ends absorb kinetic energy, though they only decelerate the piston and do not lock the load if air pressure drops.
Airtac JSI Series Standard Cylinder JSI125X330S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X330S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 330 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 JSI125X330S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×330 | 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 JSI125X330S Is Used
Injection Mold Clamping
Provides the 6136 N push force needed to secure heavy injection mold halves, utilizing the 330 mm stroke to open wide enough for robotic part extraction.
Press Ejection Systems
Ejects dense metal stampings from a 400-ton press, where the 125 mm bore delivers enough reliable thrust to break the part free without hesitation.
Pallet Stopper Gates
Acts as a high-force diverter gate in automated palletizers, handling heavy loads while the -S magnet confirms gate position via DMSE sensors.
Is the Airtac JSI Series Standard Cylinder JSI125X330S the Right Cylinder?
When sizing this 125 mm bore, stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, while no larger JSI bore exists above this class. Because this SKU features the -S magnet, it is fully ready for CMSE or DMSE sensors. For the 330 mm stroke, external guides are strongly recommended to prevent rod bending under heavy side loads. Remember that standard air cushions only decelerate the piston near stroke ends; to prevent drifting when air is lost or a valve is centered, 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 JSI125X330S FAQ
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. At 0.7 MPa, push is 8590 N and pull is 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. This 125 mm bore cylinder uses a G1/2 air port, an M27x2.0 rod thread, and operates at speeds of 30-500 mm/s.
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 achieves this through an extruded hard-anodized aluminum barrel with no external rods, while still accommodating standard LB, FA, TC, and CA mountings.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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