This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX165S, 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 SI40BX165S
The AirTAC Airtac SI40 Standard Cylinder SI40BX165S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 165mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX165S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke165 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX165S
- 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 SI40BX165S
The AirTAC SI40BX165S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore, 165 mm stroke, and a SUS304 stainless piston rod. It delivers 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this EOL unit with the SAI40BX165S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI upgrade features a new piston seal using two Y-shaped one-way elements for low start-up pressure and long life. The SI -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX165S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX165S |
| Bore size | Ø40 mm |
| Stroke | 165 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 SAI40BX165S 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 SAI40BX165S 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 SI40BX165S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×165 | 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 SI40BX165S Is Used
Stainless Rod Diverters
Ideal for packaging lines where the SUS304 rod resists washdown corrosion while pushing 628 N to actuate diverters over 165 mm.
Compact Part Ejection
Ejects machined parts from fixtures using 879 N at 0.7 MPa, fitting neatly into existing ISO 15552 tooling profiles.
Replacing the Airtac SI40 Standard Cylinder SI40BX165S with the SAI40BX165S
To replace this SI40BX165S, order the SAI40BX165S. Verify your ISO 15552 mounting interface, 165 mm stroke, G1/4 port, and the -B SUS304 rod option. The built-in -S magnet supports legacy CS1-B/DS1-B switches. If you need more force than the 879 N at 0.7 MPa, step up to a 50 mm bore; if less is acceptable, a 32 mm bore provides 563 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX165S
- ✓ 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 SI40BX165S FAQ
Yes, the SI40BX165S is discontinued. The direct replacement is the SAI40BX165S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 165 mm stroke, G1/4 port, and SUS304 rod, fitting existing fixtures perfectly.
It features a G1/4 air port. The force ratings are: 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 maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX165S replacement — usually within 7-8 hours.