Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 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 JSIJ125X20-20
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore JIS profile cylinder is built for heavy-duty tasks. The hard-anodized aluminum barrel omits external rods, making the body noticeably shorter and more compact than a same-bore ISO 15552 unit. It handles about 3682 N of real work safely, which means roughly 313 kg lifted vertically with a 2:1 margin.
The JSIJ125X20-20 uses an external adjuster to shorten the extend stroke on site by up to 20 mm. The nominal 20 mm stroke remains the maximum, while the retract end stays fixed. Air enters via a G1/2 port, and adjustable 33 mm cushions decelerate the load at both ends. This plain SKU lacks a magnet and cannot take a sensor; the -S variant is required for CMSE/DMSE switches.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 JSIJ125X20-20
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×20 | 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 JSIJ125X20-20 Is Used
Heavy Press Stubbing
Shortens the extend stroke by up to 20 mm on site to dial in the exact bottoming position for a high-tonnage press without changing the fixture.
Stamping Pin Setter
Uses the 6136 N thrust at 0.5 MPa to drive pins, while the external adjuster fine-tunes the final pin depth within a 0-20 mm window.
Rigid End Stopper
Acts as a compact JIS-profile end stop for heavy pallets, using the adjustable stroke to tweak the contact face position on the fly.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20 the Right Cylinder?
For lighter jobs, the 100 mm bore offers 3927 N push at 0.5 MPa, whereas stepping up is impossible as 125 mm is the largest size. The 20 mm adjuster window lets you fine-tune the extend end position without swapping cylinders, which is ideal when sharing a spare across slightly different short-stroke variants. You can mount it via FA, LB, TC, TCM1, or TCM2 brackets. Because this is a no-magnet SKU, position sensing is impossible here. For any stroke over 300 mm, always guide the load to prevent side-load damage.
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 JSIJ125X20-20 FAQ
It pushes 6136 N and pulls 5734 N at 0.5 MPa. At 0.7 MPa it pushes 8590 N and pulls 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. This 125 mm bore cylinder uses a G1/2 port.
The external adjuster lets you shorten the extend stroke by up to 20 mm on site, so the usable extend range is 0-20 mm. The nominal 20 mm stroke is the maximum, and the retract end is fixed. This stop sets the end position but does not hold the load; for load holding 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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