This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX750, 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 SI40BX750
The AirTAC SI40 Standard Cylinder SI40BX750 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX750, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX750
- 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 SI40BX750
The AirTAC SI40BX750 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 750mm stroke, and SUS304 stainless steel rod. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40BX750. This direct upgrade shares the same ISO 15552 mounting interface, G1/4 port, and output force, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal (two Y-shaped one-way elements) for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a sensor. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX750 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX750 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX750 |
| Bore size | Ø40 mm |
| Stroke | 750 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 SAI40BX750 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 SAI40BX750 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 SI40BX750
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×750 | 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 SI40BX750 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 750mm stroke and 628 N force, with the SUS304 rod resisting humidity in washdown zones.
Storage Retrieval
Extracts totes from deep racking bays where the 750mm extension is necessary and the ISO 15552 mounting allows easy fixture swaps.
Replacing the Airtac SI40 Standard Cylinder SI40BX750 with the SAI40BX750
To replace the SI40BX750, order the SAI40BX750. Confirm the ISO 15552 interface, 40mm bore, 750mm stroke, G1/4 port, and SUS304 rod. Because this SKU lacks a magnet (-S), it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. At 0.5 MPa, the 40mm bore yields 628 N push; sizing down to 32mm gives 402 N, while sizing up to 50mm provides 982 N. For the 750mm stroke, use external guides to prevent rod bending and side loads. The cushion only decelerates; for load holding on air loss, use an external rod lock or pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX750
- ✓ 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 SI40BX750 FAQ
Yes, the SI40BX750 is discontinued. The direct replacement is the SAI40BX750. It shares the same ISO 15552 mounting interface, 40mm bore, 750mm stroke, force, and G1/4 port, fitting directly into existing setups.
The bore is 40mm with a G1/4 port. Force output is 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. The speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX750
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX750 replacement — usually within 7-8 hours.