This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX600, 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 SI40BX600
The AirTAC Airtac SI40 Standard Cylinder SI40BX600 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX600, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX600
- 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 SI40BX600
The AirTAC SI40BX600 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 600mm stroke, and SUS304 stainless steel rod. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40BX600. This direct upgrade shares identical ISO 15552 mounting dimensions, bore, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. For this no-magnet SKU, switches cannot be fitted. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX600 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX600 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX600 |
| Bore size | Ø40 mm |
| Stroke | 600 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 SAI40BX600 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 SAI40BX600 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 SI40BX600
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×600 | 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 SI40BX600 Is Used
Long-Stroke Diversion
Pushes packages across a 600mm conveyor lane using the 32kg safe vertical lift capacity, relying on external guides to prevent rod bending.
Stainless Rod Ejection
Ejects parts in humid washdown environments using the SUS304 corrosion-resistant rod, sized for a 377N working load at 0.5MPa.
Lowering Assembly
Lowers lightweight fixtures 600mm, requiring an external pilot check valve since the standard cushion only decelerates and cannot hold the load.
Replacing the Airtac SI40 Standard Cylinder SI40BX600 with the SAI40BX600
To replace the SI40BX600, order the SAI40BX600 to match the 40mm bore, 600mm stroke, G1/4 port, and ISO 15552 mounting. Confirm the SUS304 rod (-B) and note this SKU lacks a magnet, so no CS1-B/DS1-B sensor can be fitted. If you need more force, the 50mm bore offers 982N push. For the 600mm stroke, use an external guide to prevent rod bending and side loads. The air cushion only decelerates; use an external rod lock or pilot check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX600
- ✓ 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 SI40BX600 FAQ
Yes, the SI40BX600 is discontinued. The direct replacement is the SAI40BX600. It shares the same ISO 15552 mounting interface, 40mm bore, 600mm stroke, G1/4 port, and force, fitting existing fixtures perfectly.
The 40mm bore uses a G1/4 port. It generates 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. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX600
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX600 replacement — usually within 7-8 hours.