Airtac JSI Series Standard Cylinder JSI125X300FA
The AirTAC Airtac JSI Series Standard Cylinder JSI125X300FA is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 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 JSI125X300FA
Delivering massive thrust in a tight envelope, this double-acting JIS-standard profile cylinder exerts 6136 N of push force at 0.5 MPa. Because it uses an extruded hard-anodized aluminum barrel instead of external rods, the overall body is noticeably shorter and more compact than a same-bore ISO 15552 unit, saving valuable real estate on heavy machinery.
The bore uses a G1/2 port and a 32 mm carbon steel rod with an M27x2.0 thread. A heterogeneous two-way piston seal retains grease for low-friction life across 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. Note this SKU lacks the -S magnet, so it cannot accept CMSE or DMSE position switches.
Airtac JSI Series Standard Cylinder JSI125X300FA Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X300FA |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 JSI125X300FA
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×300 | 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 JSI125X300FA Is Used
Injection Mold Clamping
Provides the 6136 N push force needed to secure heavy injection mold halves during plastic part injection cycles.
Press Fit Assembly
Drives large bearings into automotive housings using its 313 kg safe vertical lift capacity and FA flange mount.
Pallet Stopper Gate
Acts as a heavy-duty stopping barrier on high-mass pallet conveyors, retracting 300 mm to clear oversized loads.
Is the Airtac JSI Series Standard Cylinder JSI125X300FA the Right Cylinder?
When sizing this 125 mm bore, the adjacent JSI100 offers 3927 N push at 0.5 MPa if you need less force, while there is no larger bore in the JSI range for higher demands. The FA flange accessory provides a solid front mounting face for this 300 mm stroke. Because standard air cushions only decelerate the piston near stroke ends and do not act as a brake, you must add an external rod lock or pilot-operated check valve to hold a suspended load. At 300 mm, external guides are recommended to prevent rod bending under side 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 JSI125X300FA FAQ
This 125 mm bore cylinder features a G1/2 port, an M27x2.0 rod thread, and a 32 mm rod. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push and 8028 N pull at 0.7 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore. It uses an extruded aluminum barrel without external rods to save space while retaining heavy-duty thrust.
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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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