Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-40
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-40 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 JSIJ125X275-40
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore JIS profile cylinder brings heavy-duty actuation into a compact footprint that is physically shorter than a same-bore ISO 15552 unit. The hard-anodized aluminum extruded barrel houses a 32 mm rod, M27x2.0 rod thread, and G1/2 ports. An external adjuster provides a 40 mm extend-shortening window, meaning the usable extend stroke ranges from 235 to 275 mm on site without swapping the cylinder.
With a nominal 275 mm maximum stroke, the retract end remains fixed while you fine-tune the extend end position to the exact process requirement. This SKU lacks a magnet and cannot take a CMSE or DMSE sensor; order the -S variant for position sensing. In real work it handles about 3682 N safely, lifting roughly 313 kg vertically with a 2:1 margin. The air cushion decelerates the load near stroke end but does not lock it, so fit an external rod lock or pilot-operated check valve if you need to hold a load on air loss.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-40 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-40 |
|---|---|
| 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 JSIJ125X275-40
| 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 JSIJ125X275-40 Is Used
Press Tonnage Tuning
Dial in the exact 235 to 275 mm extend contact point on a heavy press without machining custom spacers.
Pallet Positioning Stop
Adjust the stop length on-site by 40 mm to accommodate varying pallet depths in a high-force conveyor line.
Heavy Clamp Calibration
Fine-tune the clamping reach on large fabricated parts, using the 6136 N thrust to secure the workpiece.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X275-40 the Right Cylinder?
Size this 125 mm bore against the 100 mm option, which provides 3927 N push at 0.5 MPa, or step up if you exceed the 1251 kgf maximum at 1.0 MPa. The 40 mm adjustable window is ideal when you need to share a spare cylinder across slightly different stroke variants or dial in a precise end position on the machine. Mounting options include Basic, FA, LB, TC, TCM1, and TCM2. Because this is a non-magnet SKU, it cannot accept CMSE/DMSE sensors. For this 275 mm stroke, ensure adequate side-load guidance to prevent premature seal wear.
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 JSIJ125X275-40 FAQ
At 0.5 MPa it delivers 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. It operates between 0.15 and 1.0 MPa with a 1.5 MPa proof pressure, and the speed range is 30-500 mm/s.
The nominal 275 mm stroke is the maximum. The external stop screw lets you shorten the extend stroke by up to 40 mm on site, giving a usable extend range of 235 to 275 mm. The retract end is fixed, and this stop sets the end position rather than locking the load.
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