Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 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 JSIJ125X50-20
Delivering 6136 N of thrust at 0.5 MPa, this 125 mm bore JIS profile cylinder integrates an external adjuster to fine-tune the extend endpoint on-site. The -20 code means you can shorten the 50 mm nominal stroke by up to 20 mm, yielding a usable 30 to 50 mm extend window while the retract end remains fixed. Built with an extruded hard-anodized aluminum barrel, the body is noticeably shorter and more compact than a same-bore ISO 15552 unit.
It handles a safe working load of about 3682 N, which translates to lifting roughly 313 kg vertically with a 2:1 margin. Pneumatically ported at G1/2, it runs at 30-500 mm/s. Note that this specific SKU lacks a magnet, so it cannot accept CMSE/DMSE sensors without switching to the -S variant. Furthermore, the adjustable stop sets position only; it does not hold load on air loss, so fit an external rod lock for vertical safety.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20 Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 JSIJ125X50-20
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×50 | 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 JSIJ125X50-20 Is Used
Heavy Pallet Clamping
Applies up to 6136 N of clamping force to secure large pallets, with the 20 mm extend window allowing precise on-site pressure tuning without changing mounts.
Press Fit Adjustment
Handles light press duties where the exact 30 to 50 mm extend endpoint must be dialed in on the factory floor to accommodate material thickness variations.
Compact Machinery Integration
Fits into tight heavy machinery frames where a standard ISO 15552 cylinder of the same bore would be too long, providing full force in a shorter body.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20 the Right Cylinder?
When sizing this heavy-duty actuator, compare both directions: the 100 mm bore offers 3927 N push at 0.5 MPa, while this 125 mm jumps to 6136 N, sitting at the top high edge of the range. The adjustable stroke is ideal for synchronizing multiple end-of-stroke positions across shared machine spares without swapping the whole cylinder. Mounting options include Basic, FA, LB, TC, TCM1, and TCM2. Because this is a non-magnet SKU, position sensing is impossible here; order the -S version if you require CMSE/DMSE switches. For any stroke over 300 mm, always use external guide rails to prevent rod side-loading damage.
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 JSIJ125X50-20 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa it delivers 8590 N push and 8028 N pull. The theoretical maximum force is 1251 kgf at 1.0 MPa. The air port is G1/2, the rod is 32 mm with an M27x2.0 thread, and it features 33 mm adjustable air cushions at both ends.
The 50 mm stroke is the maximum nominal extend length. The external -20 adjuster lets you shorten the extend stroke by up to 20 mm on-site, giving a usable range of 30 to 50 mm. The retract end is fixed. This mechanism only sets the end position and does not lock the load; you need a pilot-operated check valve for holding.
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