Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-30S
The AirTAC SAIJ125X45-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, generating 6136N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. The integrated -S magnet enables position sensing via CMSE reed or DMSE solid-state switches fitted into the dual-side sensor grooves.
This specific SKU provides a 15-45 mm adjustable travel window, allowing you to dial back the 45 mm nominal stroke by up to 30 mm. This built-in mechanical stop lets you fine-tune the retract end-position during commissioning without adding external stops. It features a PT tapered port, a 32 mm carbon steel rod, and variable air cushions at both ends to decelerate the payload smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125X45-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125X45-30S Is Used
Machine Changeover
Dial in the 15-45 mm travel window during product size changeovers to set new retract positions without physically replacing the cylinder or adding external stopper blocks.
Heavy Clamping
Leverage the 6136N pull force at 0.5 MPa to secure heavy workpieces, using the rear adjuster to fine-tune the exact clamping distance at the end of the stroke.
Assembly Positioning
Set precise end-stops for heavy assembly presses, utilizing the 32 mm carbon steel rod and PT tapered port to handle substantial side loads and high flow requirements.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-30S the Right Cylinder?
Select this 125 mm bore model when an application requires high force combined with variable end-stops for product size changeovers. If your process needs less force, stepping down to an 80 mm bore yields 2268N of pull force at 0.5 MPa, whereas moving up to a 160 mm bore provides 9425N. Choose this adjustable SAIJ variant over a fixed-stroke SAI when you need precise end-position tuning at setup without physically swapping the cylinder.
When specifying this cylinder, note that the rear adjuster acts only as a travel stop to set the end-position and decelerate the load; it does not hold the load without live air pressure. For fail-safe load holding, consider an AirTAC SAIL or BSAI clamp-lock cylinder. This model is dimensionally interchangeable with ISO 15552 cylinders and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X45-30S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of pull force and 6136N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the 45 mm nominal stroke by up to 30 mm, creating a 15-45 mm usable travel window. This allows you to fine-tune the retract end-position during commissioning without changing the cylinder.
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