Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-20S 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 SAIJ125X85-20S
The AirTAC SAIJ125X85-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. The integrated -S magnet enables precise position detection using AirTAC CMSE reed or DMSE electronic solid-state sensors housed within the dual-side barrel grooves. A PT tapered port thread ensures a robust, leak-free pneumatic connection.
Featuring an 85mm nominal stroke, the external rear stopper allows you to fine-tune the effective travel down by up to 20mm, creating a precise 65-85mm usable window. This adjustability eliminates the need to swap cylinders during product changeovers. The carbon steel piston rod provides durable performance, while the adjustable air cushions at both ends manage deceleration for this high-thrust 125mm bore actuator.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-20S |
|---|---|
| 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 SAIJ125X85-20S
| 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 SAIJ125X85-20S Is Used
Product Changeover
Dial in the 65-85mm stroke window during format size changes on a packaging line, using the rear screw to set new end positions without changing the actuator.
High-Force Positioning
Leverage the 6136N push force at 0.5MPa to move heavy jigs into exact alignment, relying on the fine-tuned stopper for repeatable final placement.
Machine Setup
Trim the 85mm nominal travel by up to 20mm during initial commissioning to perfectly time heavy-duty stamping or clamping operations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-20S the Right Cylinder?
Select this 125mm bore actuator when an application demands high thrust that smaller bores cannot provide, such as the 80mm option which only yields 2513N at 0.5MPa. The SAIJ125X85-20-S is ideal when you need on-the-fly end-position tuning without adding external stops. For an exact ISO 15552 replacement match, verify the 85mm stroke, 20mm adjustment range, PT port thread, and the required -S magnet configuration.
Mounting options include the SAIJ subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Remember that the rear adjuster functions strictly as a travel stop, not a lock; the cylinder cannot hold a load without live air pressure. For dead-pilot or fail-safe load holding, consider an AirTAC SAIL locking cylinder or an external rod lock.
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 SAIJ125X85-20S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9MPa.
The rear stopper screw allows you to shorten the 85mm nominal stroke by up to 20mm, providing an adjustable travel window of 65 to 85mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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