Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X40-20S
The AirTAC Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X40-20S is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø50mm bore and 40mm 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.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting, adjustable stroke
- Rod threadM18×1.5
- CushionAdjustable, 20.5 mm
About the Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X40-20S
Delivering 982 N of push force at 0.5 MPa, this 50 mm bore JIS profile cylinder brings on-site flexibility to short-stroke automation. The hard-anodized aluminum barrel omits tie rods entirely, making the overall body shorter and more compact than a same-bore ISO 15552 unit. Because the bore maps to a G1/4 port, pneumatic plumbing stays straightforward.
The external adjuster allows you to shorten the extend stroke by up to 20 mm on-site, meaning usable forward travel spans 20 to 40 mm while the retract end remains fixed. This lets you fine-tune the end position without physically swapping the cylinder. The -S suffix adds a built-in piston magnet for CMSE/DMSE switches that mount directly into the side grooves. In practical terms, it handles about 589 N of safe working load, which translates to roughly 50 kg lifted vertically with a 2:1 margin.
Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X40-20S Technical Specifications
| Model | Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X40-20S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 40 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | G1/4 |
| Rod thread | M18×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 JSIJ50X40-20S
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 50 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×40 | 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 JSIJ50X40-20S Is Used
Probe Depth Trimming
Dial in the exact 20 to 40 mm extension for a testing probe station without machining new hard stops, ensuring precise contact pressure on delicate PCBs.
Carton Flap Folding
Fine-tune the push stroke on a packaging line to accommodate varying box heights, preventing over-travel and crushed corrugated flaps on the fly.
Part Ejection Stroke
Adjust the ejection reach on a small press to safely kick parts clear of the die, accommodating different product lengths without changing tooling.
Is the Airtac JSIJ32~50 Adjustable Cylinder JSIJ50X40-20S the Right Cylinder?
When sizing this actuator, the neighboring 40 mm bore offers 628 N push at 0.5 MPa for lighter duties, while the 63 mm bore steps up to 1559 N if your payload increases. The 20 mm adjustable window is especially useful when you want a shared spare across slightly different stroke variants or need to dial in a precise end position after mounting. JSIJ supports Basic, FA, LB, TC, TCM1, and TCM2 mounting styles. The -S magnet enables position sensing with CMSE/DMSE reed or electronic switches. Because the nominal stroke is only 40 mm, side-load risks are minimal, but for any stroke over 300 mm you should always use external guide rails 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 JSIJ50X40-20S FAQ
At 0.5 MPa it provides 982 N push and 825 N pull force. At 0.7 MPa it provides 1374 N push and 1154 N pull. The theoretical maximum force is 200 kgf at 1.0 MPa. This 50 mm bore cylinder uses a G1/4 air port and features a 20 mm adjustable air cushion at each end.
The nominal stroke is 40 mm, which is the maximum forward travel. The external adjuster lets you shorten the extend stroke on-site by up to 20 mm, giving a usable extend range of 20 to 40 mm. The retract end is fixed. This mechanism sets the end position and does not lock the load; for holding a load on air loss, use an external rod lock or pilot-operated check valve.
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