Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20S
The AirTAC SAIJ40X45-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 25-45 mm usable travel window by allowing you to trim the nominal 45 mm stroke back by up to 20 mm during setup. Delivering 628 N of push force at 0.5 MPa, it handles precise end-position tuning without requiring cylinder swaps.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. It features PT tapered port threads (G1/4) and an extruded aluminum barrel with sensor grooves on both sides. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets, omitting FB, CA, CB, and CR options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAIJ40BX45-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SAIJ40BX45-20S Is Used
Machine Changeovers
Fine-tune the 25-45 mm travel window during product size changes to set new end positions without physically replacing the cylinder.
End-Position Calibration
Dial in the exact retract stop during commissioning to compensate for mechanical tolerances in your tooling setup.
Light Assembly Thrust
Apply 628 N of push force at 0.5 MPa for pressing or locating tasks where exact stroke length is critical.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20S the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N of thrust at 0.5 MPa but stepping down to a 32 mm bore (402 N) is insufficient. The adjustable stroke is ideal for machine changeovers, allowing you to fine-tune the 25-45 mm travel window on the fly instead of swapping a fixed-stroke SAI cylinder. To replace an ISO 15552 unit, match the 40 mm bore, 45 mm stroke, PT port, and -S magnet.
The rear adjuster acts as a travel stop to set deceleration, not a lock, meaning it will not hold the load without live air pressure. For position holding without continuous air, consider an external pilot-operated check valve or the AirTAC SAIL lock cylinder. Because the stroke is under 300 mm, side-load risks are lower, though the 16 mm rod still requires alignment for optimal seal life.
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 SAIJ40BX45-20S FAQ
The rear adjuster lets you shorten the 45 mm nominal stroke by up to 20 mm, providing a usable travel window of 25-45 mm. It acts as a mechanical stop for end-position tuning, not a load-holding lock.
It delivers 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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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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