Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-30S
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-30S 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 JSIJ125X275-30S
Delivering 6136 N of extend thrust at 0.5 MPa, this 125 mm bore JIS profile cylinder brings heavy-duty force into a compact envelope that is noticeably shorter than a same-bore ISO 15552 unit. The hard-anodized extruded aluminum barrel keeps the assembly light without external support rods. A built-in piston magnet (-S) allows CMSE or DMSE switches to drop directly into the side sensor grooves for precise position detection.
The JSIJ125X275-30S uses an external adjuster to shorten the extend stroke on-site by up to 30 mm, giving a usable forward travel of 245 to 275 mm while the retract end remains fixed. You can fine-tune the end position without swapping the cylinder, yielding a safe working load of roughly 3682 N or a vertical lift capacity of about 313 kg with a 2:1 margin. Pneumatic connections use a G1/2 port, and adjustable air cushions at both ends absorb impact over the 33 mm cushion zone.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-30S Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-30S |
|---|---|
| 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 JSIJ125X275-30S
| 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 JSIJ125X275-30S Is Used
Heavy Pallet Forming
Provides the 6136 N push force needed to compact heavy pallets, with the 30 mm extend adjuster allowing precise on-site tuning of the final press height.
High-Load Diverting
Handles robust diverting arms on thick-gauge conveyors where the 125 mm bore delivers enough thrust to move fully loaded pallets without stalling.
Adjustable Stops
Acts as a heavy-duty end stop where the 245 to 275 mm stroke window lets operators dial in the exact stopping position for varying package sizes.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-30S the Right Cylinder?
When sizing this unit, the neighboring 100 mm bore offers 3927 N push at 0.5 MPa for lighter frames, while stepping up is not possible as 125 mm is the maximum standard bore. This adjustable-stroke design is ideal when you need on-site end-position tuning or want a single shared spare across multiple stroke variants. Mounting options include FA, LB, TC, TCM1, and TCM2 brackets. The included -S magnet supports CMSE/DMSE sensors. For any stroke at or above 300 mm, always use a side-load guide to prevent rod deflection. Note that a plain cylinder drifts on air loss; the cushion only decelerates, so fit an external rod lock or pilot-operated check valve for held 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 JSIJ125X275-30S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa the push is 8590 N and pull is 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-500 mm/s, and it uses a G1/2 port with a 33 mm adjustable cushion at each end.
The nominal stroke is 275 mm, which is the maximum extend travel. The external adjuster lets you shorten the extend stroke on-site by up to 30 mm, yielding a usable range of 245 to 275 mm. The retract end is fixed, and this stop mechanism sets the end position but does not lock the load.
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