Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100S
The AirTAC SAIJ125X850-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa. The integrated -S magnet enables position detection using AirTAC CMSE reed or DMSE electronic solid-state switches housed within the dual-side sensor grooves.
This model features a nominal 850 mm stroke that can be fine-tuned down by up to 100 mm, creating a precise 750-850 mm usable travel window. It is built with an SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and utilizes PT tapered port threads (G1/2). The extruded aluminum barrel maintains standard ISO 15552 mounting dimensions while incorporating adjustable air cushions at both ends to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125AX850-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125AX850-100S Is Used
Variable End-Stop Machining
Dial in the exact 750-850 mm clamping depth on large machining fixtures without adding external mechanical stops.
Product Size Changeover
Quickly adjust the retract distance on heavy conveyor diverters to accommodate varying package lengths.
Commissioning Fine-Tuning
Trim the effective stroke by up to 100 mm during machine setup to perfectly synchronize multi-axis movements.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-100S the Right Cylinder?
Choose this adjustable-stroke cylinder when your assembly requires exact end-position tuning during commissioning or product changeovers without swapping out the physical actuator. If your application needs less thrust, stepping down to a 100 mm bore yields 3927 N push force at 0.5 MPa; conversely, a 160 mm bore provides 10053 N for heavier loads. To replace this cylinder with a standard ISO 15552 unit, match the 125 mm bore, 850 mm stroke, PT port threads, and -S magnet.
Because the stroke is 850 mm, the 32 mm diameter rod must support an extended length, meaning an external guide is strongly recommended to prevent excessive side-loading and premature seal wear. Note that the rear adjuster acts only as a travel stop and does not hold the load without continuous air pressure; for fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX850-100S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa the push force is 8590 N, and it reaches 11045 N push at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel by up to 100 mm, providing a usable stroke window of 750 to 850 mm. This stopper sets the end position but does not lock the load without live air pressure.
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Standard models usually ship in 3-4 days.
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