Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30S 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 SAIJ40BX550-30S
The AirTAC SAIJ40X550-30-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 520 to 550 mm usable travel window, allowing you to dial in the retract end-position precisely during commissioning without adding external stops. Built with a SUS304 stainless steel rod, it delivers 628 N of push force at 0.5 MPa and uses a PT G1/4 port.
This adjustable-stroke model integrates magnets for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the rear screw functions strictly as a travel stop for deceleration, not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30S |
|---|---|
| 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 SAIJ40BX550-30S
| 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 SAIJ40BX550-30S Is Used
Machine Changeover
Quickly fine-tune the 520-550 mm travel window during product size changes without physically swapping the cylinder or repositioning hard stops.
Variable End Stops
Ideal for diverter gates on conveyors where the retract position needs precise adjustment to accommodate different package dimensions.
Commissioning Calibration
Dial in the exact end-of-stroke position during initial machine setup to perfect timing and avoid mechanical binding.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30S the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N push force at 0.5 MPa but needs finer end-position control than a fixed SAI cylinder offers. If your setup demands higher thrust, stepping up to the 50 mm bore yields 982 N. Because the 550 mm stroke is relatively long, ensure external guide rails are used to support the load and prevent excessive side-loading on the M12x1.25 rod thread.
For a true ISO 15552 replacement match, verify the 40 mm bore, 550 mm stroke, 30 mm adjustment range, PT tapered port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If the machine requires holding a load without live air pressure, select a SAIL or BSAI cylinder instead of relying on this adjuster.
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 SAIJ40BX550-30S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder 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 screw allows you to shorten the effective stroke by up to 30 mm, creating a 520 to 550 mm usable travel window. It acts as a mechanical stop to fine-tune the end position and does not lock the load without air pressure.
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