Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-20
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting, adjustable stroke
- 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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-20
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore pneumatic actuator tackles heavy industrial motion with ease. The hard-anodized aluminium profile barrel keeps the overall body shorter and more compact than a same-bore ISO 15552 cylinder, saving valuable machine footprint. It handles a safe working load of roughly 3682 N, which means you can lift about 313 kg vertically with a 2:1 safety margin.
The -20 code means an external stop screw lets you shorten the extend stroke on-site by up to 20 mm, giving a usable range of 280 to 300 mm without swapping the cylinder. This on-site adjustability is perfect for fine-tuning end positions, while the retract end remains fixed. Pneumatic connections use a G1/2 port, and the adjustable air cushions provide 33 mm of deceleration at each end. Note this specific SKU lacks a magnet, so it cannot take CMSE or DMSE sensors.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-20 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 mm |
| Acting type | Double acting, adjustable stroke |
| 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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-20
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×300 | 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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-20 Is Used
Heavy Pallet Lift
Raises loaded pallets in packaging lines, using the 20 mm extend adjuster to dial in the exact discharge height without reprogramming the machine.
Press Ejection
Pushes heavy stamped parts out of a press bed, relying on the 6136 N thrust and 33 mm cushions to absorb the sudden impact at the end of travel.
Divertor Gate
Actuates a large sorting gate on a conveyor, tweaking the 300 mm extend stroke down by 20 mm on-site to match a new box size perfectly.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X300-20 the Right Cylinder?
When sizing this actuator, compare the 6136 N push force at 0.5 MPa against the smaller 100 mm bore offering 3927 N, or step up if you need the absolute maximum 1251 kgf at 1.0 MPa. The 20 mm extend-shortening window is highly useful when you need to share a spare cylinder across slightly different stroke variants or fine-tune a tooling stop on the fly. Mounting options include Basic, FA, LB, TC, TCM1, and TCM2 brackets. Because the stroke is 300 mm, always support the load with an external guide to prevent rod bending and excessive side loading. This non-magnetic version cannot host position sensors; add the -S suffix for CMSE/DMSE switch readiness.
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 JSIJ100~125 Adjustable Cylinder JSIJ125X300-20 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa the output rises to 8590 N push and 8028 N pull. The theoretical maximum force is 1251 kgf at 1.0 MPa.
The 300 mm nominal stroke is the maximum length. The external adjuster lets you shorten the extend stroke by up to 20 mm on-site, yielding a usable range of 280 to 300 mm. The retract end is fixed, and this stop is for positioning only, not for holding a load.
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Standard models are processed and dispatched in 3-5 business days.
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