Airtac JSI Series Standard Cylinder JSI40X30S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X30S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 30mm 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
- Stroke30 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 JSI40X30S
Delivering 628 N of push force at 0.5 MPa, this double-acting 40 mm bore cylinder is built for tight machinery layouts. As a JIS-standard profile unit, it is notably shorter and more compact than an equivalent ISO 15552 cylinder of the same bore. The extruded hard-anodized aluminum barrel eliminates external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life.
Because this SKU includes the -S magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing. It features a G1/4 port and an M14x1.5 rod thread. For practical 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.
Airtac JSI Series Standard Cylinder JSI40X30S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X30S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 JSI40X30S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×30 | 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 JSI40X30S Is Used
Short-Stroke Clamping
Ideal for securing aluminum extrusions in CNC machining centers using its 30 mm travel and 628 N push force at 0.5 MPa.
Small Part Ejection
Ejects molded plastic components from tight tooling spaces where the compact JIS profile saves valuable mounting area.
Package Diverting
Pushes light cartons on a packaging conveyor, safely handling loads under the 32 kg vertical lift threshold.
Is the Airtac JSI Series Standard Cylinder JSI40X30S the Right Cylinder?
When sizing this 40 mm bore unit against its neighbors, note that a smaller 32 mm JSI yields 402 N of push at 0.5 MPa, while stepping up to a 50 mm bore provides 982 N. This 30 mm stroke version is ideal for very short clamping or ejecting motions. If your machine experiences air loss or the valve is centered, the piston will drift, as the adjustable air cushion only decelerates the rod near the stroke end; install an external rod lock or pilot-operated check valve if you must hold a suspended load.
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 JSI40X30S FAQ
The 40 mm bore generates 628 N push and 528 N pull at 0.5 MPa, or 879 N push and 739 N pull at 0.7 MPa. The theoretical maximum is 128 kgf at 1.0 MPa. It uses a G1/4 air port and runs at speeds of 30-800 mm/s.
The JSI series follows JIS standards and uses an extruded aluminum barrel without external rods, making it shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. This specific 30S model includes a piston magnet for CMSE/DMSE sensors.
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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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