Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-75
The AirTAC SAIJ125X170-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the retract position by up to 75 mm. This creates a highly flexible usable travel window between 95 and 170 mm, letting operators fine-tune end positions during commissioning without swapping out the cylinder or adding external stops. It features a robust 32 mm carbon steel rod and a G1/2 port to efficiently handle heavy loads.
In the 125 mm bore class, this actuator generates 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. It uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and relies on adjustable air cushions at both ends to decelerate the stroke smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125X170-75 Is Used
Product Size Changeovers
Dial in the retract stroke from 170 mm down to 95 mm instantly when switching product formats on a packaging line, eliminating the need to physically swap cylinders.
Commissioning End-Stop Tuning
Fine-tune the final end position during machine setup without fabricating or bolting on external mechanical stops, ensuring perfect alignment of heavy 125 mm bore assemblies.
Variable Positioning Stops
Provide adjustable physical stops for heavy-duty automated machinery where the exact retract distance needs occasional field adjustment to accommodate tooling wear.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-75 the Right Cylinder?
Choose this 125 mm bore model when your application requires substantial thrust, such as the 6136 N pull force at 0.5 MPa, but still needs precise end-position tuning over a 95 to 170 mm window. If your force requirements are lower, stepping down to a 100 mm bore provides 3681 N of pull force at 0.5 MPa. Conversely, if you need more power, the 160 mm bore offers 9425 N of pull force at 0.5 MPa. The adjustable stroke is ideal for product-size changeovers on a line, whereas a fixed-stroke SAI is better for dedicated repetitive tasks.
When matching an ISO 15552 replacement, verify the 125 mm bore, 170 mm stroke, 75 mm adjustment range, PT tapered port threads, and the required mounting bracket. Because the stroke is under 300 mm, side-load stress on the 32 mm rod is moderate, though an external guide is still recommended for heavy off-center loads. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for true fail-safe load holding, consider the SAIL or BSAI series instead.
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 SAIJ125X170-75 FAQ
An external adjusting screw at the rear of the cylinder acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 75 mm. This provides a usable travel window between 95 and 170 mm, which can be fine-tuned during commissioning without changing the cylinder.
The SAIJ125X170-75 generates 6136 N of pull force and 8590 N of push force at 0.5 MPa. At its maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf of push force.
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