Airtac JSI Series Standard Cylinder JSI125X165S
The AirTAC Airtac JSI Series Standard Cylinder JSI125X165S is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 165mm 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
- Stroke165 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 JSI125X165S
Delivering massive thrust for heavy automation, the AirTAC JSI125X165S pushes with 6136 N and pulls with 5734 N at 0.5 MPa. Built to JIS standards, this double-acting profile cylinder features an extruded hard-anodized aluminum barrel that is notably shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable machine space.
The -S suffix means a piston magnet is installed, allowing CMSE or DMSE sensors to drop directly into the side grooves for position detection. Because the 6136 N rating is theoretical, plan for about 3682 N of real work at 0.5 MPa, which safely lifts about 313 kg vertically with a 2:1 margin. The grease-retaining two-way piston seal ensures long, low-friction life, and fluid is supplied via a G1/2 port.
Airtac JSI Series Standard Cylinder JSI125X165S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X165S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 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 JSI125X165S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×165 | 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 JSI125X165S Is Used
Stamping Press Feed
Pushes heavy coil stock into a mechanical press, utilizing the 6136 N push force to overcome material friction.
Pallet Squaring Station
Uses the 165 mm stroke to square up loaded pallets before stretch wrapping, handling weights up to 313 kg safely.
Injection Mold Ejection
Provides the robust 5734 N pull force required to retract heavy mold cores or eject large plastic parts from a press.
Is the Airtac JSI Series Standard Cylinder JSI125X165S the Right Cylinder?
This 125 mm bore sits at the top of the JSI range, so if the load is lighter, stepping down to the 100 mm bore (which provides 3927 N push at 0.5 MPa) saves air and cost. There is no larger JSI bore available. The 165 mm stroke is well within standard limits and does not require special side-load guides. Since this SKU includes the -S magnet, it is fully ready for CMSE or DMSE switches. Remember that air cushions only decelerate the piston near the stroke end; if air is lost, the piston drifts, so use an external rod lock or pilot-operated check valve to 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 JSI125X165S FAQ
This 125 mm bore cylinder features a G1/2 air port, an M27x2.0 rod thread, and operates at 30-500 mm/s. The thrust 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, with a theoretical maximum of 1251 kgf at 1.0 MPa.
The JSI is a JIS-standard cylinder that uses an extruded hard-anodized aluminum barrel without external rods, making it shorter and more compact than an ISO 15552 cylinder of the same bore. The built-in -S magnet allows CMSE or DMSE switches to mount directly into the side sensor grooves.
Authorized Export Seller
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.
Related AirTAC JSI Cylinders
Request a Quote for Airtac JSI Series Standard Cylinder JSI125X165S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.