Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75S
The AirTAC SAIJ125X450-75-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 450 mm travel that can be fine-tuned down by up to 75 mm, giving an effective usable window of 375-450 mm. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy positioning tasks. This variant includes a magnet for CMSE reed and DMSE electronic sensors, uses a SUS420J2 stainless steel rod, and has PT tapered ports.
The rear adjuster acts as a mechanical stop to trim the retract end position without adding external stops. It does not hold the load without live air; for load-holding without pressure, consider SAIL or BSAI types. This extruded aluminum profile cylinder supports a mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125AX450-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125AX450-75S Is Used
Machine Changeover
Dial in the 375-450 mm travel window during product size changes without replacing the cylinder or bolting on external stops.
Heavy Positioning
Leverage 6136 N pull force at 0.5 MPa for moving heavy jigs or fixtures, tuning the final end-stop precisely at commissioning.
Assembly Line Setup
Fine-tune the retract position on automated lines to accommodate varying part dimensions quickly and accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75S the Right Cylinder?
Choose this 125 mm bore when 80 mm falls short (80 mm yields 2268 N pull at 0.5 MPa) but 160 mm is excessive (9425 N pull). The adjustable stroke is ideal for machine changeover, letting you dial in the exact 375-450 mm end position on-site instead of swapping cylinders. For an exact ISO 15552 replacement, match the 125 mm bore, 450 mm stroke, 75 mm adjustment, PT ports, and -S magnet.
With a 450 mm stroke, the 32 mm rod carries significant side-load risk if unsupported; always guide the load externally. The operating speed is 30-500 mm/s. The SAIJ omits FB, CA, CB, and CR mounts.
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 SAIJ125AX450-75S FAQ
At 0.5 MPa operating pressure, it 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 acts as a mechanical stop, allowing you to shorten the 450 mm nominal stroke by up to 75 mm. This creates a 375-450 mm usable travel window for fine-tuning end positions without swapping the cylinder.
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