Airtac JSI Series Standard Cylinder JSI40X25
The AirTAC Airtac JSI Series Standard Cylinder JSI40X25 is a genuine double acting 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
- 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 JSI Series Standard Cylinder JSI40X25
Delivering 628 N of push force at 0.5 MPa, this double-acting 40 mm bore cylinder is built for tight spaces where every millimeter counts. The JIS-standard extruded aluminium profile is notably shorter than an ISO 15552 cylinder of the same bore, giving you a compact footprint without sacrificing power. A heterogeneous two-way piston seal retains grease for a long, low-friction service life.
Because this SKU lacks the -S magnet, it cannot accept CMSE or DMSE position switches. For sizing, plan for about 377 N of real work at 0.5 MPa, which means it lifts roughly 32 kg vertically with a 2:1 safety margin. The unit features a G1/4 port, an M14x1.5 rod thread, and adjustable air cushions at both ends to smoothly decelerate the 25 mm stroke.
Airtac JSI Series Standard Cylinder JSI40X25 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X25 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| 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 JSI Series Standard Cylinder JSI40X25
| JSI | JIS-standard profile cylinder (double-acting 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 JSI Series Standard Cylinder JSI40X25 Is Used
Small Part Ejection
Uses the short 25 mm stroke to rapidly kick small plastic mouldings out of an injection press, safely absorbing the end-of-stroke impact with its built-in air cushion.
Package Diverting
Employs the 628 N push force at 0.5 MPa to push lightweight cardboard cartons from a main conveyor belt onto a secondary sorting lane.
Clamp Actuation
Fits into densely packed assembly fixtures where the compact JIS profile saves valuable space, securely clamping small aluminium brackets during a drilling operation.
Is the Airtac JSI Series Standard Cylinder JSI40X25 the Right Cylinder?
If 628 N of push at 0.5 MPa is too much, stepping down to the 32 mm bore yields 402 N. If you need more power, the 50 mm bore provides 982 N. This 25 mm stroke is the shortest available, making it perfect for very short clamping or ejecting motions. Since this specific model has no -S suffix, it cannot host magnetic sensors; you would need the JSI40X25-S variant to use CMSE or DMSE switches.
Remember that the adjustable cushion only slows the piston near the end of travel and does not function as a brake. If your machine loses air, the rod will drift, so fit an external rod lock or pilot-operated check valve for any load that must remain suspended.
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 JSI Series Standard Cylinder JSI40X25 FAQ
This 40 mm bore cylinder features a G1/4 air port and an M14x1.5 rod thread. The thrust outputs are 628 N push and 528 N pull at 0.5 MPa, increasing to 879 N push and 739 N pull at 0.7 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
The JIS-standard profile design is shorter and more compact than an ISO 15552 cylinder of the same bore. Because this specific SKU lacks a magnet, it cannot accept CMSE or DMSE sensors; you must select the -S variant for position detection.
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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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