Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20S 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 SAIJ40BX950-20S
The AirTAC SAIJ40X950-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the retract end position by up to 20 mm. This creates a usable travel window of 930-950 mm, giving you precise control over the final end-stop without swapping out the entire actuator. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
Because this 950 mm stroke approaches the maximum standard limit for this bore, the M12x1.25 rod thread provides a robust interface, though an external guide is still recommended for long unsupported loads. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet supports AirTAC CMSE reed and DMSE electronic solid-state switches for exact position feedback.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20S |
|---|---|
| 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 SAIJ40BX950-20S
| 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 SAIJ40BX950-20S Is Used
Changeover Calibration
Dial in the exact 930-950 mm end-stop during product size changeovers without adding external stopper blocks to the machine frame.
Long-Stroke Diverting
Precisely position diverters on a conveyor line, using the rear adjuster to compensate for mechanical drift over time.
Assembly Pressing
Apply up to 628 N of force at 0.5 MPa for light pressing tasks, fine-tuning the retract position to accommodate varying part heights.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-20S the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (which provides 402 N push at 0.5 MPa) but want to avoid the larger footprint of a 50 mm option. The adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, functioning as a physical stop rather than a load-holding lock. If your application requires the load to be held without live air pressure, consider the SAIL or BSAI series instead.
To match this ISO 15552 interchangeable cylinder, confirm the 40 mm bore, 950 mm stroke, 20 mm adjustment, PT tapered port threads, and the -S magnet option. Mounting hardware is available in a reduced set including Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ40BX950-20S FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 930-950 mm. It only sets the travel end and does not lock or hold the load without continuous air pressure.
At a 0.5 MPa operating pressure, the SAIJ40X950-20-S generates 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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