This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX10S, 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 SI40BX10S
The AirTAC Airtac SI40 Standard Cylinder SI40BX10S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 10mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX10S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke10 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX10S
- 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 SI40BX10S
The AirTAC SI40BX10S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 10mm stroke, and a SUS304 stainless steel rod. Delivering 628N push force at 0.5MPa, it is directly replaced by the SAI40BX10S direct equivalent. This upgrade retains the G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet supports CS1-B/DS1-B switches, while the SAI family adds SAIL lock and BSAI clamp-lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX10S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX10S |
| Bore size | Ø40 mm |
| Stroke | 10 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 SAI40BX10S 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 SAI40BX10S 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 SI40BX10S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×10 | 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 SI40BX10S Is Used
Short-Stroke Clamping
Ideal for compact clamping tasks in machining fixtures, utilizing the 10mm stroke and 628N force at 0.5MPa to secure components firmly.
Stainless Rod Ejection
The SUS304 rod option excels in mildly corrosive ejection applications, pushing parts out of automated test equipment with reliable 528N pull force.
Compact Part Sorting
Fits tightly into sorting diverts where space is limited, providing rapid 30-800mm/s actuation to redirect small products on a conveyor line.
Replacing the Airtac SI40 Standard Cylinder SI40BX10S with the SAI40BX10S
To replace the SI40BX10S, order the SAI40BX10S. Confirm the ISO 15552 mounting interface, 40mm bore, 10mm stroke, G1/4 port, and your specific mounting accessory. The -B rod is SUS304 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B sensors. Sizing both ways: a neighbouring 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX10S
- ✓ 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 SI40BX10S FAQ
Yes, the AirTAC SI40BX10S is discontinued. The direct replacement is the SAI40BX10S. It shares the same ISO 15552 mounting interface, 40mm bore, 10mm stroke, G1/4 port, and force ratings, fitting directly into existing setups.
The 40mm bore features a G1/4 air port. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX10S replacement — usually within 7-8 hours.