Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50
The AirTAC SAIJ125X750-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 50mm adjustment range, allowing you to fine-tune the effective travel window from 700 to 750mm during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
Delivering 8590N of push force at 0.7MPa (11045N at 0.9MPa), this unit is built for heavy-duty positioning. It features a 32mm carbon steel piston rod and PT tapered G1/2 ports. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125X750-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125X750-50 Is Used
Variable End-Stop Tuning
Dial in the exact retraction point within the 700-750mm window during machine setup, avoiding the need to swap cylinders when product dimensions change slightly.
Heavy-Duty Positioning
Leverage the 8590N thrust at 0.7MPa to move substantial jigs or fixtures into place, relying on the external stopper for repeatable fine-tuning.
Changeover Automation
Quickly adapt automated assembly lines to new product sizes by turning the rear adjustment screw, reducing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-50 the Right Cylinder?
Choose this 125mm bore when the 80mm class (3518N push at 0.7MPa) is insufficient but the 160mm bore is oversized. The adjustable stroke is ideal for product changeovers requiring variable end-stops, replacing fixed-stroke SAI cylinders when exact end-position tuning is critical. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB/CA/CB/CR).
Because the 750mm stroke is long, the unsupported rod is susceptible to deflection; always use an external guide to prevent side-load damage. Operating speed is 30-500mm/s, and the cylinder uses variable air cushions at both ends for deceleration, though neither the cushion nor the adjuster functions as a lock.
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 SAIJ125X750-50 FAQ
At 0.7MPa it provides 8590N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster allows you to shorten the 750mm nominal stroke by up to 50mm, creating a usable travel window of 700-750mm. It acts as a physical stop and does not lock the load without air pressure.
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