Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X25-20FA
The AirTAC Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X25-20FA is a genuine double acting, adjustable stroke JIS-standard air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 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 JSIJ40X25-20FA
Generating 628 N of push force at 0.5 MPa, this 40 mm bore JIS profile cylinder brings precise positioning to tight machinery. The extruded hard-anodized aluminum barrel omits tie rods entirely, yielding a build that is noticeably shorter and more compact than a same-bore ISO 15552 unit. It handles about 377 N of real work safely, which translates to lifting roughly 32 kg vertically with a 2:1 margin.
The dash-20 code means an external stop screw can shorten the 25 mm extend stroke on-site by up to 20 mm, giving a usable extend range of 5 to 25 mm without swapping the cylinder. The retract end remains fixed, and the G1/4 port drives the 30-800 mm/s speed range. This basic SKU lacks a magnet and cannot accept CMSE or DMSE sensors; order an -S variant if you need position detection.
Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X25-20FA Technical Specifications
| Model | Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X25-20FA |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 JSIJ40X25-20FA
| JSIJ | JIS-standard profile cylinder (adjustable-stroke type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×25 | 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 JSIJ40X25-20FA Is Used
Short-Stroke Clamping
Dials in the exact 5 to 25 mm clamping travel needed for delicate workholding, preventing over-travel on fragile parts.
Compact Ejector
Fits into tight machine envelopes to push small parts out of a mold, using the external stop to set a precise ejection distance.
Transfer Gate Stop
Acts as a height-specific physical stop on a conveyor line, where the adjustable window fine-tunes the blocking position on-site.
Is the Airtac JSIJ32~50 Adjustable Cylinder JSIJ40X25-20FA the Right Cylinder?
When sizing, the 32 mm bore offers 402 N push at 0.5 MPa for lighter loads, while the 50 mm bore steps up to 982 N if this 40 mm unit is undersized. The adjustable stroke is ideal for fine-tuning the extend endpoint on-site or sharing a single spare across multiple stroke variants. The included FA foot mounting accessory sets the interface, and the broader JSIJ family supports LB, TC, TCM1, and TCM2 brackets. Because the nominal stroke is only 25 mm, side-load guides are less critical here, but always guide the tooling for any application exceeding 300 mm. Remember that a plain cylinder drifts on air loss; the air cushion only decelerates the piston near the end caps, so fit an external rod lock or pilot-operated check valve for held loads.
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 JSIJ40X25-20FA FAQ
This 40 mm bore cylinder pushes 628 N and pulls 528 N at 0.5 MPa. At 0.7 MPa it pushes 879 N and pulls 739 N. The theoretical maximum force is 128 kgf at 1.0 MPa. It uses a G1/4 air port and features a 16 mm rod with an M14x1.5 thread.
The 25 mm nominal stroke is the maximum extend length. The dash-20 code provides an external adjuster that lets you shorten the extend stroke by up to 20 mm on-site, yielding a usable extend range of 5 to 25 mm. The retract end is fixed, and this stop only sets the end position—it does not lock the load.
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Standard models are processed and dispatched in 3-5 business days.
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