Airtac JSI Series Standard Cylinder JSI125X140S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X140S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 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 JSI125X140S
Delivering massive thrust for industrial automation, this double-acting JIS-standard profile cylinder generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. Built with an extruded hard-anodized aluminum barrel, the JSI125X140S is deliberately shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space without sacrificing power. The heterogeneous two-way piston seal retains grease for a long, low-friction service life.
Because this SKU includes the -S suffix, a built-in piston magnet enables CMSE or DMSE switches to drop directly into the side grooves for position sensing. The G1/2 air port handles the high volume needed for the 125 mm bore, operating at speeds of 30-500 mm/s. For practical sizing, plan for about 3682 N of real work at 0.5 MPa, which safely lifts roughly 313 kg vertically with a 2:1 margin.
Airtac JSI Series Standard Cylinder JSI125X140S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X140S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 JSI125X140S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×140 | 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 JSI125X140S Is Used
Heavy Stamping Press
Provides the intense clamping force required to hold thick steel plates stationary inside a large stamping press.
Injection Molding Extraction
Roughly 313 kg of vertical lift capacity makes it ideal for pulling heavy molded plastic automotive fascias out of high-tonnage injection machines.
Pallet Dispenser
Pushes empty wooden pallets into automated loading besides, utilizing the 140 mm stroke to index materials rapidly.
Is the Airtac JSI Series Standard Cylinder JSI125X140S the Right Cylinder?
When sizing this 125 mm bore, the next size down is the 100 mm option offering 3927 N push at 0.5 MPa, while the 125 mm stands as the largest available JSI bore with a maximum theoretical output of 1251 kgf at 1.0 MPa. The 140 mm stroke is well within standard limits, keeping the assembly rigid without requiring external guide shafts to prevent rod bending. Mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, TC/TCM1/TCM2 trunnion, or an I/Y/F/U rod knuckle. Remember that a standard air cylinder drifts when air is lost or a valve centers; the adjustable 33 mm cushions only decelerate the piston near stroke ends. To hold a load securely, install an external rod lock or a pilot-operated check valve.
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 JSI125X140S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa it provides 8590 N push and 8028 N pull. The theoretical maximum force is 1251 kgf at 1.0 MPa. It uses a G1/2 air port, a 32 mm rod, and an M27x2.0 rod-end thread.
The JSI series is a JIS-standard cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 125 mm bore, saving footprint on machinery. It features a hard-anodized aluminum extruded barrel with no external rods. The -S magnet on this unit allows CMSE/DMSE sensors to fit directly into the side grooves.
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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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