This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X15, 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 SI40X15
The AirTAC Airtac SI40 Standard Cylinder SI40X15 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 SAI40X15, 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 → SAI40X15
- 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 SI40X15
The AirTAC SI40X15 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 15 mm stroke. It delivers 628 N of push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X15, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, force, port and mounting hardware.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the new SAI family offers SAIL and BSAI lock variants the SI line lacked. Note this specific SKU lacks a magnet (-S) and cannot accept a sensor.
Airtac SI40 Standard Cylinder SI40X15 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X15 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X15 |
| 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 SAI40X15 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 SAI40X15 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 SI40X15
| 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 SI40X15 Is Used
Short-Stroke Clamping
Ideal for holding light workpieces in machining or assembly fixtures where a brief 15 mm travel and 628 N force secure the part.
Ejector Mechanism
Provides a fast 30-800 mm/s ejection push for small stamped or molded components out of a press cavity.
Gate Diversion
Actuates small sorting flaps or diverter gates on a conveyor line, utilizing the compact 40 mm profile barrel.
Replacing the Airtac SI40 Standard Cylinder SI40X15 with the SAI40X15
To replace the SI40X15, order the SAI40X15. Confirm your ISO 15552 mounting interface, 40 mm bore, 15 mm stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory (LB, FA, CA, TC, etc.). Because this SKU lacks a magnet, it cannot accept CS1-B or DS1-B sensors; if position detection is required, select an SAI40X15S instead. For sizing, the 32 mm bore offers 402 N push at 0.5 MPa, while the 50 mm bore provides 982 N. A plain cylinder does not hold load without live air; the cushion only decelerates. For a held load, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. Even at 15 mm stroke, ensure minimal side-load to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X15
- ✓ 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 SI40X15 FAQ
Yes, the AirTAC SI40X15 is discontinued. The direct replacement is the SAI40X15. It shares the same ISO 15552 mounting interface, 40 mm bore, 15 mm stroke, output force, G1/4 port, and mounting accessories, fitting directly into existing fixtures.
The SI40X15 features 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 maximum force of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X15
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X15 replacement — usually within 7-8 hours.