Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20S
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20S 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 JSIJ125X20-20S
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore actuator tackles heavy-duty positioning with ease. It handles a safe working load of about 3682 N, which means you can vertically lift roughly 313 kg with a 2:1 safety margin. The G1/2 port feeds the large piston efficiently, while the hard-anodized aluminum profile barrel keeps the total length shorter than a same-bore ISO 15552 unit.
The external stop screw lets you shorten the extend stroke on-site by up to 20 mm, giving a usable range of 0-20 mm for fine-tuning the end position without swapping the cylinder. Because this SKU includes the -S magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for precise sensing. Note that the air cushion only decelerates the load near the end of travel; an external rod lock or pilot-operated check valve is required to hold a load securely on air loss.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20S Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20S |
|---|---|
| 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 JSIJ125X20-20S
| 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 JSIJ125X20-20S Is Used
Heavy Press Clamping
Use the 0-20 mm extend adjuster to dial in the exact clamping depth on heavy stamping fixtures, absorbing part tolerance variations without reprogramming the machine.
Short-Stroke Stamping
Leverage the 6136 N push force at 0.5 MPa for compact marking or riveting operations where a short, hard impact is needed within a tight machinery footprint.
Pallet End-Stop Tuning
Adjust the external stop screw on-site to set the precise 0-20 mm protrusion for halting heavy pallets, allowing quick changes between different product widths.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X20-20S the Right Cylinder?
When sizing this actuator, stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, whereas this 125 mm unit provides maximum thrust. The 20 mm adjustable window is ideal for sharing a spare across slight stroke variants and tuning end positions on-site. You can mount it using FA, LB, TC, TCM1, or TCM2 brackets. The built-in magnet supports CMSE/DMSE sensors. Because the nominal stroke is only 20 mm, side-load guiding is less critical than on long-trroke units, but always ensure axial alignment to protect the M27x2.0 rod thread.
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 JSIJ125X20-20S FAQ
This 125 mm bore cylinder uses a G1/2 port and a 32 mm rod. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa.
The nominal 20 mm stroke is the maximum extend length. An external stop screw lets you shorten the extend stroke on-site by up to 20 mm, yielding a usable range of 0-20 mm. The retract end remains fixed, and this stop only sets the end position rather than locking the load.
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