Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-20S
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-20S is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 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 JSIJ125X275-20S
Delivering 6136 N of push force at 0.5 MPa, this large-bore JIS actuator brings heavy-duty motion into a profile barrel that is noticeably shorter than a same-bore ISO 15552 cylinder. The hard-anodized aluminum extrusion carries no tie rods, and the G1/2 port feeds a 125 mm bore rated for a theoretical maximum of 1251 kgf at 1.0 MPa. In practical terms it handles about 3682 N of safe working load, which means you can lift roughly 313 kg vertically with a 2:1 safety margin.
The -20 code means an external adjuster can shorten the extend stroke on site by up to 20 mm, giving a usable forward travel of 255 to 275 mm without swapping the cylinder. The retract end remains fixed. Because this is an -S SKU, a built-in piston magnet lets you drop CMSE or DMSE reed and electronic switches straight into the side grooves for exact positioning. Note that the adjustable stop sets the end position; it does not lock the load, so fit an external rod lock or pilot-operated check valve if you need to hold a vertical load against air loss.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-20S Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-20S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 JSIJ125X275-20S
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×275 | 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 JSIJ125X275-20S Is Used
Heavy Pallet Lifts
Raises loaded pallets in distribution hubs, using the 20 mm adjuster to dial in the exact upper stop without reprogramming the PLC.
Press Ejection
Pushes heavy stamped parts out of a press bed, relying on the 125 mm bore to deliver 8590 N of extend force at 0.7 MPa.
Roller Lane Diverter
Shifts heavy conveyor lanes side-to-side, using the built-in magnet and DMSE switches to confirm the extend position.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-20S the Right Cylinder?
When sizing this actuator, look at the neighboring bores to confirm your fit. If 6136 N of push at 0.5 MPa is too much, the 100 mm bore offers 3927 N; if you need more, the 125 mm sits at the top of the range. The adjustable stroke is ideal when you want to fine-tune the end position on site or standardize one spare cylinder across several stroke variants. You can mount it using FA, LB, TC, TCM1, or TCM2 brackets. The included magnet supports CMSE/DMSE sensors. For any stroke at or over 300 mm, guide the load externally to prevent side-load wear on the rod seal.
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 JSIJ125X275-20S FAQ
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa it pushes 8590 N and pulls 8028 N. The theoretical max force is 1251 kgf at 1.0 MPa. It uses a 32 mm rod, a G1/2 port, an M27x2.0 rod thread, and has a 33 mm adjustable air cushion at each end. Speed ranges from 30 to 500 mm/s.
The 275 mm nominal stroke is the maximum forward travel. The external adjuster lets you shorten the extend stroke on site by up to 20 mm, giving a usable range of 255 to 275 mm so you can fine-tune the end position. The retract end is fixed. This stop only sets position; it does not hold the load.
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