Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10S
The AirTAC SAIJ40X550-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the nominal 550 mm travel by up to 10 mm. This yields a precise 540-550 mm usable end-position window for fine-tuning during commissioning without adding external stops. Built with a SUS304 stainless steel rod and a PT tapered port, it delivers 628 N of push force at 0.5 MPa.
The extruded aluminum barrel features sensor grooves on both sides, and the integrated -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic switches for position feedback. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40BX550-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40BX550-10S Is Used
Commissioning Fine-Tuning
Dial in the exact 540-550 mm end position during machine setup without swapping cylinders or adding external stop blocks.
Product Changeover
Adjust the rear stopper by up to 10 mm to accommodate slight length variations when switching product sizes on a line.
Conveyor Diverter
Provides 628 N of push force at 0.5 MPa to actuate diverters, with the rear stop ensuring precise travel limits.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-10S the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N push force at 0.5 MPa, stepping up from a 32 mm bore that provides 402 N. The adjustable stroke is ideal for product changeovers requiring a slightly altered end-stop, avoiding the need to swap out a fixed-stroke SAI cylinder. Because the 550 mm stroke is substantial, the 16 mm rod and M12x1.25 thread can only handle limited side loads, so an external guide is recommended for unsupported loads.
To replace an ISO 15552 cylinder, match the 40 mm bore, 550 mm stroke, 10 mm adjustment, PT port, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Operating speed ranges from 30-800 mm/s.
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 SAIJ40BX550-10S FAQ
The rear adjusting screw acts as a mechanical stop, allowing you to shorten the effective travel from 550 mm down to 540 mm. It sets the end position but does not lock the load without live air pressure.
It generates 628 N of push force and 528 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 879 N.
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