Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S
The AirTAC SAIJ40X750-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 750mm stroke that can be dialed back by up to 30mm, giving you a precise 720-750mm usable travel window for fine-tuning end positions during commissioning. Delivering 628N of push thrust at 0.5MPa, it handles mid-range actuation tasks effectively.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a built-in magnet for position sensing with CMSE reed or DMSE electronic switches. The extruded aluminum barrel incorporates sensor grooves on both sides, and the unit supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 750 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX750-30S Is Used
Machine Changeover
Dial in the 720-750mm travel window on the fly during product size changes without swapping the cylinder or re-engineering fixed stops.
Variable End Stops
Fine-tune the retract position on a long-stroke conveyor diverter to match varying package lengths during line setup.
Commissioning Calibration
Trim back the stroke by up to 30mm during initial machine commissioning to perfect tooling alignment without external spacers.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30S the Right Cylinder?
Choose this 40mm bore when an application requires 628N push force at 0.5MPa (or 1130N at 0.9MPa) and a 720-750mm travel window. If you need less force, stepping down to a 32mm bore yields 402N. An adjustable stroke is selected over a fixed SAI cylinder when you need to fine-tune the retract end position without adding external stops. For this 750mm stroke, an external guide is recommended to manage side loads, as the 16mm rod and M12x1.25 thread can only carry limited lateral forces.
Remember that the rear adjuster acts as a travel stop, not a load lock; the SAIJ does not hold position without live air. For load-holding without pressure, use an SAIL or BSAI cylinder. To replace this unit, match the 40mm bore, 750mm stroke, 30mm adjustment, PT tapered G1/4 ports, SUS304 rod, and the -S magnet.
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 SAIJ40 Adjustable Cylinder SAIJ40BX750-30S FAQ
At 0.5MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum 1.0MPa pressure, it delivers 128kgf.
The rear adjuster screw acts as a mechanical stop that shortens the 750mm nominal stroke by up to 30mm, creating a 720-750mm usable travel window. It decelerates the travel end but does not lock the load without live air pressure.
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