Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20
The AirTAC Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20 is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø40mm bore and 125mm stroke, G1/4 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.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionAdjustable, 20.5 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 JSIJ32~50 Adjustable Cylinder JSIJ40X125-20
Delivering 628 N of push force at 0.5 MPa, this 40 mm bore JIS profile cylinder saves machine space by being shorter than a same-bore ISO 15552 unit. The hard-anodized aluminum barrel keeps the build clean without external rods. It handles about 377 N of real work, roughly 32 kg lifted vertically with a 2:1 margin. Air connects via a G1/4 port.
The -20 code means an external adjuster can shorten the extend stroke by up to 20 mm on-site, giving a usable range of 105-125 mm while the retract end stays fixed. You fine-tune the end position without swapping the cylinder. This plain SKU lacks a magnet and cannot take a CMSE or DMSE sensor. Note that the adjustable cushion only decelerates the piston; it does not hold load on air loss, so use an external rod lock for vertical holding.
Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20 Technical Specifications
| Model | Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | G1/4 |
| Rod thread | M14×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 20.5 mm |
| Max standard stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×125 | 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 JSIJ32~50 Adjustable Cylinder JSIJ40X125-20 Is Used
Gauge Position Trimming
Dial in the exact extend stop within the 105-125 mm window during assembly to set a precise measurement contact point without machining spacers.
Transfer Gate Timing
Shorten the extend stroke on-site by up to 20 mm to synchronize a diverting gate with changing product lengths on the line.
Light Press Fit
Apply the 528 N pull force at 0.5 MPa to seat small bearings, tweaking the end position to avoid bottoming out the tooling.
Is the Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20 the Right Cylinder?
If 628 N push at 0.5 MPa is too light, step up to the 50 mm bore for 982 N. If it is too heavy, the 32 mm bore offers 402 N. The 20 mm adjustable window is ideal for sharing one spare across slight stroke variants or finalizing end positions during commissioning. Mounting options include FA, LB, TC, TCM1, and TCM2. Because this SKU has no -S suffix, it cannot accept a magnetic switch. For this 125 mm stroke, ensure external guides carry any side loads to prevent rod binding.
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 JSIJ32~50 Adjustable Cylinder JSIJ40X125-20 FAQ
At 0.5 MPa it pushes 628 N and pulls 528 N. At 0.7 MPa it pushes 879 N and pulls 739 N. The theoretical maximum force is 128 kgf at 1.0 MPa. The cylinder uses a G1/4 port.
The 125 mm nominal stroke is the maximum. The external stop screw lets you shorten the extend stroke by up to 20 mm on-site, yielding a usable range of 105-125 mm. The retract end remains fixed.
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