Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X225-20
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X225-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 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 JSIJ125X225-20
Delivering 6136 N of thrust at 0.5 MPa, this large-bore profile cylinder brings heavy-duty force to a JIS-standard body that is noticeably shorter than a comparable ISO 15552 unit. The hard-anodized aluminium barrel keeps the assembly light, while the G1/2 port matches the high air volume a 125 mm bore demands. It handles about 3682 N of real work safely, which translates to lifting roughly 313 kg vertically with a 2:1 margin.
The -20 code marks an external adjuster that lets you shorten the extend stroke by up to 20 mm on site, giving a usable range of 205-225 mm without swapping the cylinder. The retract end remains fixed, and the adjustable air cushions provide 33 mm of end-of-stroke deceleration. Note that this specific SKU lacks a magnet, so it cannot accept CMSE or DMSE sensors; you would need the -S variant for position detection.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X225-20 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X225-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 JSIJ125X225-20
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×225 | 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 JSIJ125X225-20 Is Used
Press Fit Tuning
Use the 20 mm extend-shortening window to fine-tune the exact bottoming position of a bearing press without machining new spacers.
Pallet Stop Adjustment
Dial in the retract stop on a heavy pallet transfer line to accommodate varying load lengths on the fly.
Heavy Lift Positioning
Lift roughly 313 kg vertically and tweak the extend endpoint by up to 20 mm to clear different fork heights.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X225-20 the Right Cylinder?
When sizing this unit, the 125 mm bore sits at the top of the range, so dropping to an 80 mm bore halves your force down to 2513 N at 0.5 MPa. Because the nominal 225 mm stroke is the maximum and the external stop screw trims the extend end by 20 mm, you can standardise on this single model across fixtures that need slightly different end positions. Mounting options include FA, LB, TC, TCM1, and TCM2. For any stroke at or above 300 mm, always guide the load to prevent side-load damage to the front cover. Without a magnet, this version cannot host a sensor.
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 JSIJ125X225-20 FAQ
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa the push is 8590 N and the pull is 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. This 125 mm bore uses a G1/2 port.
The external adjuster lets you shorten the extend stroke by up to 20 mm on site, giving a usable range of 205-225 mm from the 225 mm nominal maximum. The retract end is fixed. This mechanism only sets the end position; it does not lock the load, so you need an external rod lock or pilot-operated check valve to hold a load on air loss.
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