Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75
The AirTAC SAIJ125X650-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 575 to 650 mm usable travel window. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy-duty motion requirements. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This specific SKU is configured with a SUS420J2 stainless steel rod for enhanced corrosion resistance and PT tapered port threads. The rear adjustment screw allows operators to fine-tune the retract end position during commissioning without adding external stops. It supports speeds of 30-500 mm/s and uses adjustable air cushions at both ends to decelerate the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125AX650-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125AX650-75 Is Used
Product Size Changeover
Dial in the 575 to 650 mm travel window during product family transitions to set new end stops quickly without mechanical rebuilds.
Heavy Press Positioning
Leverage 6136 N of pull force at 0.5 MPa to move heavy assemblies, using the rear screw to fine-tune the final clamping position.
Long-Stroke Assembly Line
Implement robust 650 mm travel for large part handling, relying on adjustable air cushions to manage end-of-stroke impact energy.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-75 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (2268 N pull at 0.5 MPa) lacks the force for your load, but a 160 mm bore is too large. The 75 mm adjustment window is highly valuable for product changeovers on a line, letting you dial in the exact end position without swapping the cylinder. For any stroke of 650 mm, external guiding is strongly recommended to prevent side-loading damage to the rod.
When matching ISO 15552 replacements, verify the 125 mm bore, 650 mm stroke, PT port threads, SUS420J2 rod material, and the mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. Remember that the rear adjuster is a travel stop, not a lock; the cylinder will not hold its position without live air. For load-holding, consider SAIL or BSAI types.
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 SAIJ125AX650-75 FAQ
A rear stopper screw lets you shorten the 650 mm nominal stroke by up to 75 mm, creating a 575 to 650 mm adjustable travel window. It sets the retract end position but does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136 N of pull force and 8590 N of push force. At 0.9 MPa, the push force increases to 11045 N.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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