Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30
The AirTAC SAIJ40X950-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 920 to 950 mm, allowing you to dial back the end position by up to 30 mm during commissioning without adding external stops. Operating at 0.5 MPa, it delivers 628 N of push force and 528 N of pull force.
This unit is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is non-magnetic and will not support CMSE or DMSE switches. The rear adjuster acts purely as a travel stop to set deceleration, not as a load lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 950 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 SAIJ40BX950-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×950 | 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 SAIJ40BX950-30 Is Used
Machine Setup Calibration
Fine-tune the 920-950 mm travel endpoint during initial commissioning to perfectly strike a workpiece without remounting the entire actuator.
Product Changeover
Adjust the rear stopper by up to 30 mm to accommodate different package lengths on a packaging line, reducing downtime between production runs.
Variable End Stops
Dial in the exact retract position for a long-stroke assembly press, ensuring precise alignment without relying on external mechanical stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30 the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning within a 920-950 mm window, stepping down force from a 50 mm bore (982 N push at 0.5 MPa) while avoiding the bulk of larger units. An adjustable stroke is selected over a fixed SAI cylinder when machine setups require variable end-stops or product changeovers without physically swapping the actuator. For load-holding without live air pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is only a stop.
Because the 950 mm stroke is long and unsupported, the 16 mm rod and M12x1.25 thread still require an external guide to prevent side-load damage. This cylinder is dimensionally interchangeable per ISO 15552 and supports the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX950-30 FAQ
The rear adjuster screw lets you shorten the 950 mm nominal stroke by up to 30 mm, giving a usable travel window of 920 to 950 mm. It functions as a mechanical stop to set the end position, not as a lock to hold the load without air pressure.
At 0.5 MPa operating pressure, the SAIJ40X950-30 provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
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