Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75 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 SAIJ40BX550-75
The AirTAC SAIJ40X550-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 550 mm travel back by up to 75 mm, creating a precise 475-550 mm usable window. This built-in stopper lets you fine-tune the retract end-position at commissioning without swapping out the cylinder or fabricating external mechanical stops. Delivering 628 N of push force at 0.5 MPa, it handles standard actuation tasks with ease.
Equipped with a SUS304 stainless steel rod and PT tapered port threads, this configuration is tailored for environments where corrosion resistance on the piston rod is desired and a tight, reliable pneumatic seal is required. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to easily mount position feedback switches along the stroke if needed.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75 |
|---|---|
| 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 SAIJ40BX550-75
| 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 SAIJ40BX550-75 Is Used
Variable Product Changeover
Quickly dial back the retract stroke by up to 75 mm when switching to a shorter product format on the line, eliminating the need to physically swap cylinders for different package sizes.
End-Position Tuning
Fine-tune the final retract position during machine commissioning to achieve perfect alignment with downstream pick-and-place tooling without adding external mechanical spacers.
Long-Stroke Forming
Utilize the 550 mm travel for deep-reaching press or forming operations, using the rear stopper to safely limit the maximum retract pull-back distance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75 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 at 0.5 MPa) would be physically oversized for your envelope. The 75 mm adjustment range is particularly useful on automated lines where product sizes change frequently, allowing operators to dial in the exact retract distance on the fly rather than maintaining an inventory of fixed-stroke SAI cylinders for every part variation. Because this is a long 550 mm stroke, an external guide rail is strongly recommended to prevent excessive side-loading on the rod and front cap.
To replace an ISO 15552 cylinder with this SAIJ model, match the 40 mm bore, 550 mm stroke, PT port thread, and SUS304 (B) rod material. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR mounts. Note that the rear adjuster acts only as a travel stop and the air cushions only decelerate the load; neither will hold the load in place without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series.
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 SAIJ40BX550-75 FAQ
An external adjusting screw at the rear of the cylinder acts as a mechanical stopper, allowing you to shorten the effective stroke from 550 mm down to a minimum of 475 mm. This provides a 75 mm tuning window to set the exact retract end-position without altering the cylinder mount.
At a standard operating pressure of 0.5 MPa, the 40 mm bore generates 628 N of push force and 528 N of pull force. If higher pressure is applied, the push force increases to 879 N at 0.7 MPa.
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