Airtac JSI Series Standard Cylinder JSI125X20
The AirTAC Airtac JSI Series Standard Cylinder JSI125X20 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 20mm stroke, G1/2 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.
- BoreØ125 mm
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- CushionAdjustable, 33 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 JSI125X20
Delivering massive output in a tight footprint, this 125 mm bore double-acting actuator provides 6136 N of push force at 0.5 MPa. Built to JIS specifications, its extruded hard-anodized aluminum profile is notably shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space. The two-way piston seal retains grease for a long, low-friction service life.
Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position switches. For sizing context, plan for about 3682 N of real work at 0.5 MPa, which equates to lifting roughly 313 kg vertically with a 2:1 safety margin. The unit features a G1/2 port, an M27x2.0 rod thread, and a 20 mm stroke that is a non-standard, made-to-order length.
Airtac JSI Series Standard Cylinder JSI125X20 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X20 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 33 mm |
| Max standard stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 JSI125X20
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | 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 JSI125X20 Is Used
Heavy Stamping Clamp
Anchors thick steel plates into a hydraulic stamping press fixture, utilizing the full 6136 N push force at 0.5 MPa to prevent workpiece shifting under high vibration.
Injection Mold Ejector
Provides a short 20 mm burst of separation force to break loose large automotive injection molded panels from the core, relying on the rigid profile to withstand repeated impact.
Metal Briquette Press
Applies intense localized pressure to compact aluminum swarf into dense pucks, where the compact JIS body fits neatly within the tight frame of the recycling machinery.
Is the Airtac JSI Series Standard Cylinder JSI125X20 the Right Cylinder?
Choosing this 125 mm bore means you need maximum thrust, as there is no larger JSI frame available. If you can accept less power, stepping down to the 100 mm bore drops the 0.5 MPa push force to 3927 N. This 20 mm stroke is a non-standard made-to-order dimension, so confirm production lead times. Because the stroke is very short, side-load risks are minimal, but always ensure rigid mounting using LB foot, FA/FB flange, or TC trunnion brackets.
Note that a standard cylinder drifts when air is lost or the valve is centered; the adjustable 33 mm air cushions only decelerate the piston near the end of travel and do not act as a brake. To hold a load securely, install an external rod lock or a pilot-operated check valve. If position feedback is required, you must switch to the -S magnet variant to use CMSE or DMSE sensors.
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 JSI125X20 FAQ
This 125 mm bore cylinder operates at 30-500 mm/s with a G1/2 port and an M27x2.0 rod thread. The thrust output is 6136 N push and 5734 N pull at 0.5 MPa, increasing to 8590 N push and 8028 N pull at 0.7 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
The JSI is built to JIS standards and features an extruded aluminum barrel that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore. This space-saving design does not use external tie rods, yet it retains heavy-duty performance and includes adjustable 33 mm air cushions at both ends.
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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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