Airtac JSI Series Standard Cylinder JSI125X85
The AirTAC Airtac JSI Series Standard Cylinder JSI125X85 is a genuine double acting JIS-standard air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 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 JSI125X85
Delivering massive thrust for heavy machinery, the AirTAC JSI125X85 generates 6136 N of push force at 0.5 MPa. As a JIS-standard profile cylinder, it is intentionally shorter and more compact than an equivalent ISO 15552 model of the same 125 mm bore, saving valuable machine space without sacrificing power. The extruded hard-anodized aluminum barrel removes external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life.
This double-acting actuator uses a G1/2 port and a 32 mm piston rod with an M27x2.0 thread. Because this specific SKU lacks the -S magnet, it cannot accept CMSE or DMSE position sensors. 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. If you need dual-rod or adjustable-stroke variants, explore the related JSID and JSIJ series.
Airtac JSI Series Standard Cylinder JSI125X85 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI125X85 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 JSI125X85
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 125 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×85 | 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 JSI125X85 Is Used
Stamping Press Feeder
Pushes heavy coil stock into a mechanical stamping press, utilizing the 6136 N push force to overcome material friction and guide resistance.
Pallet Dispenser
Indexes empty pallets into an automated packaging line, where the compact JIS profile saves floor space while lifting loads approaching 313 kg.
Injection Mold Clamp
Acts as a secondary heavy-duty clamp on large injection molding machines, securely holding tooling components during the high-pressure cycle.
Is the Airtac JSI Series Standard Cylinder JSI125X85 the Right Cylinder?
Choosing this 125 mm bore means you are at the top of the JSI range, as there is no larger standard size available. If your application is lighter, stepping down to the 100 mm bore reduces the push force to 3927 N at 0.5 MPa. The 85 mm stroke falls well under the 1500 mm maximum, so standard side-load concerns are minimal, though standard mounting hardware like LB foot, FA/FB flange, or TC trunnion brackets should still be used to keep the rod aligned.
Remember that the adjustable 33 mm air cushions at both ends only decelerate the piston near the stroke limits; they do not act as a brake. If air pressure drops or the valve is centered, the piston will drift, so you must add an external rod lock or a pilot-operated check valve to hold a suspended load safely in place.
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 JSI125X85 FAQ
This 125 mm bore cylinder features a G1/2 port and delivers a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa, the push increases to 8590 N and the pull to 8028 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
No, this specific SKU does not include the -S magnet, so it cannot accept CMSE or DMSE magnetic switches. You must choose the -S variant to enable sensor detection in the side grooves.
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