This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX45S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40BX45S
The AirTAC Airtac SI40 Standard Cylinder SI40BX45S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 45mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX45S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX45S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40BX45S
The AirTAC SI40BX45S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 45mm stroke, and a SUS304 stainless steel rod. Generating 628N push force at 0.5MPa, it is replaced by the SAI40BX45S. This direct upgrade shares the exact ISO 15552 mounting interface, porting (G1/4), and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
For high-temperature environments up to 150C, a Viton H seal option is available, and load-holding requires external pneumatics since cushions only decelerate.
Airtac SI40 Standard Cylinder SI40BX45S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX45S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX45S |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40BX45S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI40BX45S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40BX45S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×45 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40BX45S Is Used
Short-Stroke Diversion
The 45mm stroke provides precise actuation for diverting small items on material handling lines without occupying excessive space.
Replacing the Airtac SI40 Standard Cylinder SI40BX45S with the SAI40BX45S
To replace the discontinued SI40BX45S, order the SAI40BX45S. Confirm the ISO 15552 mounting interface, the 45mm stroke, the G1/4 port, and the -S magnet for current AirTAC switches. The SUS304 (-B) rod provides corrosion resistance. If sizing up or down, neighboring bores (32mm or 50mm) offer 402N or 982N push force at 0.5MPa. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or explore the SAIL (air-released lock) and BSAI (clamp-lock) variants. The SAIF variant integrates a 4M valve if self-actuation is needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX45S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40BX45S FAQ
Yes, the SI40BX45S is discontinued. The direct replacement is the SAI40BX45S. It shares the same ISO 15552 mounting interface, 40mm bore, 45mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The bore is 40mm with a G1/4 air port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. The rod is 16mm with an M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX45S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX45S replacement — usually within 7-8 hours.