Airtac JSI Series Standard Cylinder JSI40X15S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X15S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 15mm 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
- Stroke15 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 JSI40X15S
Generating 628 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder saves valuable space by being shorter than an ISO 15552 unit of the same 40 mm bore. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life. Equipped with a G1/4 port and an M14x1.5 rod thread, it operates at speeds of 30-800 mm/s.
Because this SKU includes the -S magnet, CMSE or DMSE position switches drop directly into the side sensor grooves. For real-world sizing, plan for about 377 N of actual work at 0.5 MPa, which translates to lifting roughly 32 kg vertically with a 2:1 safety margin.
Airtac JSI Series Standard Cylinder JSI40X15S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X15S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 15 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 JSI40X15S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×15 | 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 JSI40X15S Is Used
Short-Stroke Clamping
Ideal for locking small aluminum extrusions in a machining fixture, utilizing the 15 mm stroke and 528 N pull force at 0.5 MPa for secure holding.
Component Ejection
Provides a fast 30-800 mm/s ejection punch for plastic molded parts off an assembly conveyor, fitting neatly into tight machine cells.
Gate Diverting
Powers a compact sorting flap on a packaging line, where the built-in -S magnet confirms flap position via DMSE sensors in the side groove.
Is the Airtac JSI Series Standard Cylinder JSI40X15S the Right Cylinder?
If 628 N of push at 0.5 MPa is too much, the smaller JSI32 bore drops to 402 N; if you need more power, the JSI50 steps up to 982 N. Since this is a 15 mm stroke, side-load bending risks are minimal, but always ensure rigid mounting using LB foot, FA/FB flange, or TC trunnion brackets. Note that the air cushions only decelerate the piston near the stroke ends and do not act as a brake; if the air supply drops, the rod will drift, so add an external rod lock or pilot-operated check valve for suspended 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 JSI Series Standard Cylinder JSI40X15S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull; at 0.7 MPa it delivers 879 N push and 739 N pull. The theoretical maximum is 128 kgf at 1.0 MPa, and the air port is G1/4.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore, offering a space-saving advantage on tight machines without using external rods.
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