Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20
The AirTAC SAIJ125X35-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position without swapping out the unit. Based on a 35 mm nominal stroke and a 20 mm adjustment code, it provides a usable travel window of 15-35 mm. This bore size generates a substantial 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty pressing and clamping tasks.
The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting. It uses a PT tapered port thread and a robust 32 mm carbon steel rod with an M27x2 thread, which handles high side loads effectively. The rear adjuster acts purely as a mechanical stop to set the travel limit and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125X35-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125X35-20 Is Used
Heavy-Duty Pressing
Dial in the exact 15-35 mm crush depth during machine setup to prevent over-travel and ensure consistent assembly force.
Product Changeover
Quickly adjust the end-stop position on a packaging line when switching to a different product size without changing the cylinder.
End-Stop Tuning
Fine-tune the retraction point at commissioning to perfectly align heavy tooling without adding bulky external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X35-20 the Right Cylinder?
Select this 125 mm bore cylinder when an 80 mm bore (providing 2513 N push at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N) would be excessive. The adjustable stroke is ideal for applications requiring variable end-stops during product changeovers, eliminating the need for external stops or a fixed-stroke SAI cylinder. To match this exact ISO 15552 footprint, specify a 125 mm bore, 35 mm stroke, 20 mm adjustment, PT port thread, and no magnet.
Because the 32 mm rod and M27x2 thread provide excellent rigidity, this cylinder handles significant lateral forces. However, if your application approaches the maximum speed of 30-500 mm/s, ensure external guiding is used to prevent premature seal wear. For any load-holding requirements without continuous air pressure, integrate an external pilot-operated check valve or select a SAIL lock cylinder instead of relying on the adjuster.
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 SAIJ125X35-20 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 the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to trim the effective travel back by up to 20 mm from the 35 mm nominal stroke, creating a 15-35 mm usable window. It functions as a mechanical stop for end-position tuning and does not lock the load.
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