Airtac JSI Series Standard Cylinder JSI40X20
The AirTAC Airtac JSI Series Standard Cylinder JSI40X20 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 JSI40X20
Delivering 628 N of push force at 0.5 MPa, the AirTAC JSI40X20 is a JIS-standard double-acting profile cylinder built for tight machinery. Its extruded hard-anodized aluminum barrel sheds external rods to achieve a footprint noticeably shorter than an ISO 15552 cylinder of the same 40 mm bore. A two-way piston seal retains grease for low-friction longevity, while the G1/4 port and M14x1.5 rod thread simplify pneumatic hookup.
Because this specific SKU lacks the -S magnet, it cannot host CMSE or DMSE position switches. 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. The adjustable 20.5 mm air cushions at both ends decelerate the piston smoothly across its 30-800 mm/s speed range.
Airtac JSI Series Standard Cylinder JSI40X20 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X20 |
|---|---|
| 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 JSI40X20
| 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 JSI40X20 Is Used
Clamp Mechanisms
Provides 628 N of clamping thrust at 0.5 MPa for securing aluminum extrusions during CNC milling operations.
Package Diverters
Executes short 20 mm strokes to actuate routing gates on 30-800 mm/s packaging conveyors.
Small Part Ejection
Pushes molded plastic parts out of injection molds using the 528 N pull force on the retract stroke.
Is the Airtac JSI Series Standard Cylinder JSI40X20 the Right Cylinder?
When sizing this 40 mm bore, verify if the 628 N push at 0.5 MPa provides enough thrust, or step up to the 50 mm bore for 982 N. If you are oversizing, dropping to the 32 mm bore yields 402 N. This base JSI40X20 SKU has no magnet, so if your cycle requires position feedback you must select the JSI40X20-S variant to enable CMSE/DMSE sensors. Mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, TC trunnion, or an I/Y/F/U rod knuckle. Note that a standard cylinder drifts when air is lost or a valve centers; the cushions only decelerate the stroke and will not hold a load. Use 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 JSI40X20 FAQ
The JSI40X20 delivers 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. It uses a G1/4 air port and features a 16 mm piston rod with an M14x1.5 thread.
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, saving valuable machine space. It uses an extruded aluminum barrel without external rods. Note that this specific SKU lacks a magnet, so it cannot support CMSE or DMSE sensors without upgrading to the -S variant.
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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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