Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40
The AirTAC SAIJ125X85-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 45 to 85 mm, allowing you to dial back the 85 mm nominal stroke by up to 40 mm during commissioning. In this bore size, it delivers 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa.
This model uses a robust 32 mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. It includes variable air cushions at both ends with a 40 mm cushion length to manage kinetic energy. The extruded aluminum barrel features sensor grooves on both sides, and because no magnet is specified, it operates without position sensing hardware.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
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 SAIJ125 Adjustable Cylinder SAIJ125X85-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40 Is Used
Variable End-Stop Machining
Fine-tune the clamping travel between 45 and 85 mm on machining fixtures to accommodate different part thicknesses without mechanical rebuilds.
Product Changeover Diverter
Adjust the retract position on packaging conveyors during product size transitions, using the rear screw to set the exact 45-85 mm diverting distance.
Heavy-Duty Press Tuning
Dial in the exact pressing depth during machine setup, using the 125 mm bore's 6136 N pull force to execute precise, repeatable forming operations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40 the Right Cylinder?
Choose this 125 mm bore when an application requires substantial thrust that a 100 mm bore cannot provide, or step down to a 100 mm bore (offering 3681 N pull at 0.5 MPa) if your force requirements are lower. The 40 mm adjustment range is ideal for product changeovers on a packaging line, letting you set variable end-stops without swapping the cylinder or adding external stops. Standard PT tapered ports and a basic mounting footprint make it dimensionally interchangeable with ISO 15552 cylinders.
Remember that the rear adjuster acts only as a travel stop, not a lock; it will not hold a load without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series. Because the nominal stroke is under 300 mm, external guide requirements are minimized compared to longer strokes, though heavy loads should still be properly supported.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ 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 Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-40 FAQ
The cylinder has a nominal stroke of 85 mm with a 40 mm adjustment range, creating a usable travel window of 45 to 85 mm. You turn the rear stopper screw to fine-tune the retract end position without swapping the cylinder.
At 0.5 MPa, it provides 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
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