Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20 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 SAIJ125X750-20
The AirTAC SAIJ125X750-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 730 to 750 mm. A 20 mm adjustment screw at the rear lets you dial in the retract end position during commissioning without adding external stops.
This 125 mm bore unit uses a PT G1/2 port and a 32 mm carbon steel rod. It runs at 30 to 500 mm/s and includes variable air cushions at both ends. The extruded aluminum barrel offers sensor grooves on both sides, ready for CMSE or DMSE electronic switches if a magnet is added later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20 |
|---|---|
| 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 SAIJ125X750-20
| 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 SAIJ125X750-20 Is Used
Variable End-Stop Tuning
Fine-tune the 730-750 mm retract position on large fixtures during machine setup without swapping cylinders or bolting on external physical stops.
Product Size Changeover
Adjust the stroke by up to 20 mm on packaging lines to accommodate slightly different pallet or product heights during production runs.
Press Positioning
Set precise end positions for large pressing or clamping tasks using the 6136N force, relying on the rear screw for final travel calibration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20 the Right Cylinder?
Choose this adjustable model over a fixed SAI when you need variable end-stops for product changeovers on a line. If your process requires less force, stepping down to a 100 mm bore yields 3927N at 0.5 MPa. For higher output, a 160 mm bore provides 10053N. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding, select an SAIL or BSAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 750 mm stroke, 20 mm adjustment, PT G1/2 port, and standard carbon rod. This SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. Because the 750 mm stroke is long, use an external guide to prevent side-loading damage to the 32 mm rod.
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 SAIJ125X750-20 FAQ
The rear adjuster lets you shorten the 750 mm nominal stroke by up to 20 mm, giving a usable travel window of 730 to 750 mm. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air.
At 0.5 MPa it provides 6136N of push force and 5734N of pull force. At 0.7 MPa the push force increases to 8590N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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