Airtac JSI Series Standard Cylinder JSI40X20S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X20S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 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 JSI40X20S
Delivering 628 N of push force at 0.5 MPa, this double-acting 40 mm bore JIS-standard profile cylinder is purpose-built for tight machinery. Because it uses an extruded hard-anodized aluminum barrel, it is noticeably shorter and more compact than an ISO 15552 cylinder of the same bore. The 20 mm stroke moves quickly, and the -S suffix means a piston magnet is pre-installed for CMSE or DMSE sensors that drop directly into the side grooves.
A heterogeneous two-way piston seal retains grease for a long, low-friction service life. 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. Air enters via a G1/4 port, and adjustable air cushions at both ends decelerate the rod smoothly.
Airtac JSI Series Standard Cylinder JSI40X20S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X20S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 JSI40X20S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×20 | 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 JSI40X20S Is Used
Small Part Ejection
Uses the 628 N push force to knock lightweight plastic parts out of an injection mold cavity reliably.
Package Diverting
Short 20 mm stroke actuates a deflector gate to route small cardboard cartons on a packing line.
Clamp Actuation
Secures thin sheet metal workpieces under a CNC press using roughly 377 N of safe working load.
Is the Airtac JSI Series Standard Cylinder JSI40X20S the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm version drops the push force to 402 N at 0.5 MPa, while moving up to a 50 mm bore increases it to 982 N. This JSI40X20S includes the -S magnet, so it is ready for CMSE or DMSE position sensing. For mounting, you can use LB foot brackets, FA or FB flanges, CA/CB clevises, or TC trunnions.
Remember that a standard pneumatic cylinder drifts if air pressure drops or the valve is centered, as the end cushions only decelerate the stroke rather than locking the rod. To hold a vertical load securely, add an external rod lock or a pilot-operated check valve. The 20 mm stroke is very short, so side-load stress is minimal.
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 JSI40X20S FAQ
This 40 mm bore cylinder features a G1/4 air port and a 16 mm rod. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push and 739 N pull at 0.7 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa.
Yes, the -S suffix indicates a built-in magnet for CMSE or DMSE switches in the side grooves. Dimensionally, this JIS profile cylinder is shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore, saving machine space.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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