Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20S
The AirTAC Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20S 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 JSIJ40X125-20S
Delivering 628 N of push force at 0.5 MPa, this 40 mm bore JIS profile cylinder features an external adjuster that lets you shorten the extend stroke on-site by up to 20 mm. The nominal 125 mm stroke remains the maximum travel, giving you a usable extend range of 105 to 125 mm for fine-tuning the end position without changing the hardware. The hard-anodized aluminum extruded barrel makes the overall body shorter and more compact than a same-bore ISO 15552 unit. Because of the -S suffix, a built-in piston magnet is included for CMSE or DMSE switches that mount directly into the side grooves. The G1/4 port drives a 30-800 mm/s speed range, and the unit handles about 377 N of safe working load, which translates to roughly 32 kg lifted vertically.
The adjustable air cushion at each end provides 20.5 mm of deceleration to absorb impact near the stroke limits. Remember that the cushion only slows the piston; a plain cylinder does not hold a load on air loss, so fit an external rod lock or pilot-operated check valve if you need to prevent drift.
Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20S Technical Specifications
| Model | Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20S |
|---|---|
| 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 JSIJ40X125-20S
| 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 JSIJ40X125-20S Is Used
Clamp Position Trimming
Dial in the exact clamping depth on a machining fixture by shortening the extend stroke up to 20 mm on-site without swapping the cylinder.
Transfer Stopper Tuning
Adjust the stopper block position on a conveyor line to accommodate different product sizes using the 105 to 125 mm extend range.
Sorter Diverter Setup
Fine-tune the diverter arm reach on a packaging sorter, using the built-in magnet to confirm the retracted and extended positions.
Is the Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X125-20S the Right Cylinder?
When sizing this actuator, compare it against the neighbouring 32 mm bore, which offers 402 N of push at 0.5 MPa, and the 50 mm bore, which steps up to 982 N. The 40 mm bore sits perfectly in the middle for medium-duty tasks. The -20 mm adjustable window is highly useful when you need to share a single spare cylinder across multiple stroke variants or dial in a precise end position on the machine. You can mount it using the basic body, FA, LB, TC, TCM1, or TCM2 brackets. The included magnet supports CMSE and DMSE sensors for position feedback. For any stroke length at or above 300 mm, always use a guide rail to prevent side-load damage to the piston rod.
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 JSIJ40X125-20S FAQ
This 40 mm bore cylinder has a G1/4 air port. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push and 739 N pull at 0.7 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
An external stop screw lets you shorten the extend stroke by up to 20 mm on-site. The nominal 125 mm stroke is the maximum, so the usable extend range is 105 to 125 mm. The retract end is fixed, and the stop sets the end position rather than locking the load.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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