Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X25-20
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X25-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 25mm 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
- Stroke25 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 JSIJ125X25-20
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore JIS profile cylinder handles heavy pressing and clamping duties with ease. The hard-anodized aluminium barrel keeps the overall body shorter and more compact than a same-bore ISO 15552 unit. It connects via a G1/2 port and moves at 30-500 mm/s.
The external adjuster lets you trim the extend stroke by up to 20 mm on site, meaning you can fine-tune the end position without swapping the cylinder. With a nominal 25 mm stroke, the usable extend range becomes 5-25 mm while the retract end stays fixed. In practice it manages a safe working load of about 3682 N, which translates to lifting roughly 313 kg vertically with a 2:1 margin.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X25-20 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X25-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 JSIJ125X25-20
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×25 | 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 JSIJ125X25-20 Is Used
Heavy Duty Pressing
Use the full 6136 N extend force for stamping bearings, then dial back the stroke 5 mm on-site via the adjuster to avoid bottoming out.
Clamp Position Tuning
Secure oversized weldments by fine-tuning the extend end position within the 20 mm window without changing the cylinder mounting.
Short Stroke Ejection
Eject heavy formed parts from a press bed using a compact 5 mm adjusted stroke to save cycle time on the production line.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X25-20 the Right Cylinder?
When sizing this unit, the neighbouring 100 mm bore yields 3927 N push at 0.5 MPa, whereas this 125 mm bore sits at the top edge with 6136 N, making it ideal for maximum force tasks. The adjustable stroke is perfect for tuning exact end positions on-site or sharing a spare across slight stroke variants. You can mount it via FA, LB, TC, TCM1, or TCM2 brackets. Because this SKU lacks the -S suffix, it cannot take a magnetic sensor; choose the -S version for CMSE or DMSE switches. Even at 25 mm stroke, ensure adequate guiding if the load geometry induces side loads.
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 JSIJ125X25-20 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa it provides 8590 N push and 8028 N pull. The theoretical max force is 1251 kgf at 1.0 MPa. It uses a G1/2 port, features a 32 mm rod with an M27x2.0 thread, and has 33 mm adjustable air cushions at both ends.
The -20 code means an external stop screw allows you to shorten the extend stroke by up to 20 mm on-site. The nominal 25 mm stroke is the maximum, so the usable extend range is 5-25 mm. The retract end is fixed. This mechanism sets the end position and is not a load lock; for holding loads on air loss, use an external rod lock or pilot-operated check valve.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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