Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40S
The AirTAC SAIJ40X500-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the effective travel window down to 460-500 mm from its 500 mm nominal length. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid choice for mid-range actuation. This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for DMSE solid-state and CMSE reed sensors.
Because this is a profile cylinder with an extruded aluminum barrel, it integrates cleanly into existing ISO 15552 footprints. The rear stopper mechanism allows for precise end-position tuning during commissioning without adding bulky external stops. Note that the adjuster acts only as a travel stop and does not hold the load without live air pressure; for positive holding, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAIJ40BX500-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SAIJ40BX500-40S Is Used
Machine Changeover
Dial in the 460-500 mm travel end-stop during product size changes without physically replacing the cylinder on the line.
End-Position Tuning
Fine-tune the retract stroke at commissioning using the rear adjuster to perfect timing and avoid mechanical hard crashes.
Variable Stops
Provides a flexible end-stop for conveyor sorting arms where the exact retraction distance needs occasional adjustment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 402 N push at 0.5 MPa) is too weak, but a 50 mm bore (982 N push) is unnecessarily large. The adjustable stroke is ideal for machines requiring product changeovers, letting you dial in the 460-500 mm end position on the fly instead of swapping out a fixed-stroke SAI cylinder. To match this exact configuration for an ISO 15552 replacement, specify: 40 mm bore, 500 mm stroke, 40 mm adjustment, PT tapered ports, Basic/FA/LB/TC/FTC/TCM1/TCM2 mountings, and the -S magnet option.
With a 500 mm stroke, the 16 mm rod and M12x1.25 thread need careful alignment. Although the rod handles standard axial loads well, an external guide is recommended for long unsupported strokes to prevent side-loading damage to the seals.
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 SAIJ40BX500-40S FAQ
At 0.5 MPa it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 500 mm nominal stroke by up to 40 mm, creating a usable travel window of 460-500 mm. It only sets the end position and does not lock the load.
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