Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X450-20S
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X450-20S is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 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 JSIJ125X450-20S
Delivering 6136 N of push force at 0.5 MPa, this large-bore JIS actuator handles heavy industrial tasks while remaining more compact than a same-bore ISO 15552 cylinder. The hard-anodized aluminum profile barrel keeps the unit rigid without external rods. It integrates a built-in magnet for position sensing.
The -20 code means an external adjuster can shorten the extend stroke on-site by up to 20 mm, giving a usable range of 430 to 450 mm for fine-tuning the end position without swapping the cylinder. The retract end remains fixed. With a safe working load around 3682 N, it lifts roughly 313 kg vertically with a 2:1 margin. The unit features a G1/2 port and adjustable air cushions at both ends to manage deceleration.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X450-20S Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X450-20S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 JSIJ125X450-20S
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×450 | 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 JSIJ125X450-20S Is Used
Press Tonnage Tuning
Use the 20 mm extend window to dial in the exact 430 to 450 mm contact position on a heavy assembly press without shimming.
Pallet Positioning Stop
Acts as a robust 125 mm bore stopper for large loads, using the adjustable end position to adapt to varying pallet widths on the fly.
Heavy Lift Gate Control
Moves 313 kg vertical loads safely, relying on the G1/2 port volume and adjustable cushions to smooth out the 450 mm travel.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X450-20S the Right Cylinder?
When sizing this 125 mm bore actuator, it provides 6136 N push and 5734 N pull at 0.5 MPa; if your application requires less force, stepping down to an 80 mm bore yields 2513 N push, while staying with this bore at 0.7 MPa boosts output to 8590 N push. The adjustable stroke is ideal for sharing a spare across machines with slightly different end positions, and the -S suffix means the side grooves accept CMSE/DMSE sensors directly. Mounting options include FA, LB, TC, TCM1, and TCM2. Because the stroke is 450 mm, always use an external guide to prevent rod bending and manage 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 JSIJ125X450-20S 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 maximum force is 1251 kgf at 1.0 MPa. The air port size is G1/2.
The nominal 450 mm stroke is the maximum. An external stop screw lets you shorten the extend stroke by up to 20 mm on-site, yielding a usable range of 430 to 450 mm. The retract end is fixed, and this stop only sets position; it does not lock the load.
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Covers non-human-caused product damage.
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