Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20S
The AirTAC Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20S 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 JSIJ125X50-20S
Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore JIS profile cylinder saves machine space by being noticeably shorter than a same-bore ISO 15552 unit. The hard-anodized aluminum extruded barrel omits tie rods entirely for a clean exterior. It handles about 3682 N of real work safely, which translates to lifting roughly 313 kg vertically with a 2:1 margin.
The external adjuster lets you shorten the 50 mm extend stroke by up to 20 mm on-site, giving a usable extend range of 30-50 mm without swapping the cylinder. The retract end remains fixed. Air connects via a G1/2 port, and the built-in magnet (-S) accepts CMSE/DMSE sensors in the side grooves for position feedback.
Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20S Technical Specifications
| Model | Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20S |
|---|---|
| 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 JSIJ125X50-20S
| 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 JSIJ125X50-20S Is Used
Press Clamping
Tune the 50 mm extend stroke down by 20 mm on-site to dial in the exact clamping position for heavy stamping dies.
Pallet Stopper
Use the 6136 N push force to halt heavy pallets on a conveyor, adjusting the stopper position without changing the cylinder.
Heavy Forming
The compact JIS profile fits into tight machine cells while providing the massive force needed for metal bending operations.
Is the Airtac JSIJ100~125 Adjustable Cylinder JSIJ125X50-20S the Right Cylinder?
This 125 mm bore sits at the top of the range; step down to an 80 mm bore (2513 N push at 0.5 MPa) if your force needs are lower. The 20 mm adjustable window is ideal for tuning end positions on-site or sharing a spare across slight stroke variants. Mounting options include FA, LB, TC, TCM1, and TCM2. The -S suffix means a magnet is already fitted for CMSE/DMSE switches. For any stroke over 300 mm, use a guide rail to prevent side-load 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 JSIJ125X50-20S 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 nominal 50 mm extend stroke is the maximum. The external stop screw lets you shorten the extend stroke by up to 20 mm on-site, giving a usable range of 30-50 mm. The retract end is fixed, and this stop is for positioning only, not load holding.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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