Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50 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 SAIJ125X170-50
The AirTAC SAIJ125X170-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 170 mm travel that can be fine-tuned down by up to 50 mm, giving operators a usable 120-170 mm end-position window. Belonging to the 125 mm bore class, it delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This model uses a standard carbon steel rod with a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of switches. If position detection is required later, adding an -S magnet allows the use of AirTAC CMSE reed or DMSE electronic sensors without changing the cylinder body.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50 |
|---|---|
| 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 SAIJ125X170-50
| 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 SAIJ125X170-50 Is Used
Product Changeover
Quickly adjust the retract end-position by up to 50 mm when switching a production line to a different pallet or product size.
Heavy Press Fit
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the adjuster to set the exact pressing depth.
Machine Setup
Fine-tune the 120-170 mm travel window during initial commissioning to perfect alignment without machining custom spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-50 the Right Cylinder?
Select this 125 mm bore when a machine requires substantial thrust, such as 6136 N push at 0.5 MPa, but needs the flexibility to dial in the exact end-stop during commissioning. If your application needs less force, stepping down to a 100 mm bore yields 3927 N push force. The rear adjustment screw allows you to trim the stroke within the 120-170 mm range without adding external stopper blocks.
For ISO 15552 replacement matching, verify the 125 mm bore, 170 mm stroke, 50 mm adjustment range, PT port thread, and required mounting accessory. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because the stroke is 170 mm, ensure external guiding if the load is heavy or subject to side loads. Note that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure. For fail-safe load holding, consider an external rod lock or the AirTAC SAIL series.
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 SAIJ125X170-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke from its nominal 170 mm down to 120 mm. This creates a 120-170 mm usable travel window for fine-tuning the end position without swapping the cylinder.
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