This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX1020S, 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 SI40BX1020S
The AirTAC Airtac SI40 Standard Cylinder SI40BX1020S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1020mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX1020S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1020 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX1020S
- 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 SI40BX1020S
The AirTAC SI40BX1020S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 1020mm stroke, and a SUS304 stainless steel piston rod. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40BX1020S, matching the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants previously unavailable.
Airtac SI40 Standard Cylinder SI40BX1020S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX1020S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX1020S |
| Bore size | Ø40 mm |
| Stroke | 1020 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 SAI40BX1020S 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 SAI40BX1020S 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 SI40BX1020S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1020 | 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 SI40BX1020S Is Used
Long-Reach Diversion
Drives a 1020mm stroke diverter arm on a packaging line, utilizing the SUS304 rod to resist washdown corrosion in food handling zones.
High-Bay Ejection
Pushes bins from a vertical storage retrieval system, where the 628 N thrust at 0.5 MPa easily overcomes carton friction.
Material Transfer
Moves parts between machine cells over a 1-meter gap, relying on adjustable end cushions to decelerate the payload smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40BX1020S with the SAI40BX1020S
To replace the SI40BX1020S, order the SAI40BX1020S to retain the identical ISO 15552 mounting interface, 40mm bore, 1020mm stroke, G1/4 port, and SUS304 rod. Because the 1020mm stroke is very long, prevent rod bending by using an external guide to absorb side loads. If sizing down, a 32mm bore yields 402 N push at 0.5 MPa; if sizing up, a 50mm bore yields 982 N. Note that neither cylinder holds load without live air—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL lock variant. The built-in magnet works with CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX1020S
- ✓ 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 SI40BX1020S FAQ
Yes, the SI40BX1020S is discontinued. The direct replacement is the SAI40BX1020S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 1020mm stroke, G1/4 port, and mounting fixtures.
This 40mm bore cylinder uses a G1/4 air port. It generates 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX1020S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX1020S replacement — usually within 7-8 hours.