Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-75 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 SAIJ125X650-75
The AirTAC SAIJ125X650-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 575-650 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore actuator handles heavy positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches, though a magnet (-S) is required for their operation.
The integrated rear stopper screw allows you to dial back the effective stroke by up to 75 mm during commissioning. This mechanism acts purely as a travel stop and relies on the variable air cushions at both ends for end-of-stroke deceleration; it does not hold the load without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-75 |
|---|---|
| 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 SAIJ125X650-75
| 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 SAIJ125X650-75 Is Used
Long-Stroke Positioning
Dial in the exact 575 to 650 mm retract distance on long-travel material handling arms without adding external stopper blocks to the machine frame.
Format Changeover
Quickly adapt packaging or palletizing machinery to different product sizes by turning the rear adjuster screw up to 75 mm during line changeovers.
Heavy Assembly Press
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the adjustable stroke to fine-tune the final pressing depth safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-75 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when you need precise end-position tuning during machine setup or product changeover without swapping hardware. If 6136 N of thrust at 0.5 MPa is excessive, stepping down to an 80 mm bore yields 2513 N. Conversely, moving to a 160 mm bore provides 10053 N for heavier loads. To replace this ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, 75 mm adjustment, PT G1/2 port, and standard carbon steel rod.
With a 650 mm stroke, the 32 mm diameter rod is highly susceptible to side-loading damage if left unsupported. Always guide the load externally to prevent rod binding and premature seal wear. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR brackets found on some standard actuators.
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 SAIJ125X650-75 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull force, reaching 8590 N push at 0.7 MPa. The maximum operating speed for this 125 mm bore is 30-500 mm/s.
A rear stopper screw lets you mechanically shorten the retract stroke by up to 75 mm, creating a 575-650 mm travel window. It acts as a physical stop and does not lock the load without air pressure.
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