Airtac JSI Series Standard Cylinder JSI40X137S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X137S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 137mm 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
- Stroke137 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 JSI40X137S
Delivering 628 N of push force at 0.5 MPa, the AirTAC JSI40X137S is a double-acting JIS-standard profile cylinder built for tight machinery layouts. It is intentionally shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore, saving valuable space without sacrificing performance. The extruded hard-anodized aluminum barrel eliminates external rods to resist wear, while the heterogeneous 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 or electronic switches directly into the side sensor grooves for position detection. Plan for a safe working load of about 377 N, which equates to lifting roughly 32 kg vertically with a 2:1 safety margin. The unit features a G1/4 air port, an M14x1.5 rod-end thread, and adjustable air cushions at both ends to decelerate the piston smoothly.
Airtac JSI Series Standard Cylinder JSI40X137S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X137S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 137 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 JSI40X137S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×137 | 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 JSI40X137S Is Used
Package Diverting
Pushes small cartons off a packaging conveyor line using a reliable 628 N push force at 0.5 MPa without consuming excessive machine footprint.
Small Part Clamping
Holds lightweight aluminum or plastic components securely in a CNC machining fixture using the 528 N pull force at 0.5 MPa.
Vertical Stopper Gate
Acts as a compact pneumatic stop gate for lightweight product accumulation on a gravity feed roller track, safely lifting roughly 32 kg loads.
Is the Airtac JSI Series Standard Cylinder JSI40X137S the Right Cylinder?
When sizing this 40 mm bore, compare your actual load against the 628 N push and 528 N pull figures at 0.5 MPa. If you need less force, the smaller JSI32 bore offers 402 N of push; if your application demands more power, stepping up to the JSI50 provides 982 N. This 137 mm stroke falls well within the 1200 mm standard limit, so no special ordering is required.
Remember that a standard cylinder will drift if air pressure is lost or the valve is centered, as the adjustable cushion only decelerates the rod near the end of its travel and acts purely as a brake. To hold a load securely in place during an air loss event, you should integrate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
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 JSI40X137S FAQ
This 40 mm bore cylinder delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push and 739 N pull at 0.7 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa. It uses a G1/4 air port and operates at speeds between 30 and 800 mm/s.
The JSI series is a JIS-standard profile cylinder that is physically shorter and more compact than an ISO 15552 cylinder of the same bore, making it ideal for space-constrained machines. It is not dimensionally interchangeable with ISO 15552, but it offers similar performance in a smaller footprint.
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Standard models are processed and dispatched in 3-5 business days.
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