This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX210S, 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 SI40BX210S
The AirTAC Airtac SI40 Standard Cylinder SI40BX210S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX210S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX210S
- 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 SI40BX210S
The AirTAC SI40BX210S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 210 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40BX210S, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This specific unit includes the -B SUS304 stainless steel rod for corrosion resistance and the -S magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40BX210S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX210S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX210S |
| Bore size | Ø40 mm |
| Stroke | 210 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 SAI40BX210S 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 SAI40BX210S 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 SI40BX210S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×210 | 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 SI40BX210S Is Used
Stainless Rod Clamping
Ideal for packaging and washdown environments where the SUS304 rod resists corrosion while providing 628 N of clamping force.
Material Diversion
Actuates diverters and gates along processing lines, utilizing the 210 mm stroke to reposition products efficiently.
Replacing the Airtac SI40 Standard Cylinder SI40BX210S with the SAI40BX210S
To replace the SI40BX210S, order the SAI40BX210S and confirm the ISO 15552 mounting interface, 40 mm bore, 210 mm stroke, G1/4 port, and your specific mounting accessory. The -B denotes a SUS304 stainless rod and -S indicates a piston magnet for position sensing. If sizing up or down, neighbouring bores are 32 mm (402 N push @0.5 MPa) and 50 mm (982 N push @0.5 MPa). Note that a standard cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 210 mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX210S
- ✓ 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 SI40BX210S FAQ
Yes, the SI40BX210S is discontinued. The direct replacement is the SAI40BX210S. It is dimensionally interchangeable per ISO 15552, maintaining the same 40 mm bore, 210 mm stroke, 628 N force, G1/4 port, and mounting interface.
The bore is 40 mm with a G1/4 air 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 maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX210S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX210S replacement — usually within 7-8 hours.