This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX15, 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 SI40BX15
The AirTAC Airtac SI40 Standard Cylinder SI40BX15 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX15, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX15
- 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 SI40BX15
The AirTAC SI40BX15 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 15mm stroke, and a SUS304 stainless steel rod. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40BX15 direct. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. With no -S suffix, this SKU cannot take a magnetic switch.
The replacement SAI40BX15 matches the G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX15 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX15 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX15 |
| Bore size | Ø40 mm |
| Stroke | 15 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 SAI40BX15 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 SAI40BX15 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 SI40BX15
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 SI40BX15 Is Used
Short-Stroke Clamping
Ideal for compact clamping tasks requiring precise 15mm movements, utilizing the 628N push force to secure components firmly during machining.
Stainless Rod Ejection
The SUS304 rod option excels in light ejection duties where moisture or minor corrosion is a concern, providing reliable 528N pull force.
Replacing the Airtac SI40 Standard Cylinder SI40BX15 with the SAI40BX15
To replace the SI40BX15 with the SAI40BX15, verify the ISO 15552 mounting interface, 40mm bore, 15mm stroke, G1/4 port, and SUS304 stainless rod. Because this SKU lacks an -S magnet, it cannot accept a sensor; if position detection is needed, order a magnet-equipped SAI40B. A plain cylinder does not hold load on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant. For sizing both ways: a 32mm bore offers 402N push at 0.5MPa, while a 50mm bore offers 982N. This 15mm stroke is nonstandard, so confirm exact end-of-stroke dimensions.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX15
- ✓ 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 SI40BX15 FAQ
Yes, the AirTAC SI40BX15 is discontinued. The direct replacement is the SAI40BX15, which shares the same ISO 15552 mounting interface, 40mm bore, 15mm stroke, force, and G1/4 port. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
It features a G1/4 air port and provides 628N push / 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. The 15mm stroke is nonstandard, operating at 30-800 mm/s.
Request a Quote for the SAI40BX15
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX15 replacement — usually within 7-8 hours.