This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X10, 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 SI40X10
The AirTAC Airtac SI40 Standard Cylinder SI40X10 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 SAI40X10, 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 → SAI40X10
- 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 SI40X10
The AirTAC SI40X10 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 10mm stroke, delivering 628 N push force at 0.5 MPa. The direct replacement is the SAI40X10, matching the exact G1/4 port, M12x1.25 rod thread and mounting interface.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X10 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X10 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X10 |
| 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 SAI40X10 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 SAI40X10 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 SI40X10
| 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 SI40X10 Is Used
Short-Stroke Clamping
Ideal for holding light workpieces in machining fixtures where a 10mm travel and 628 N force at 0.5 MPa securely seats parts without overtravel.
Ejector Mechanism
Provides a fast 30-800 mm/s ejection pulse for small stamped or molded components, using the adjustable 27mm cushion to soften end-of-stroke impact.
Divertor Actuation
Drives small conveyor sorting gates where a compact 40mm bore and minimal 10mm stroke rapidly shift product flow between lanes.
Replacing the Airtac SI40 Standard Cylinder SI40X10 with the SAI40X10
To replace the SI40X10, order the SAI40X10. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. Because this specific SKU has no -S magnet, it cannot support position sensing; if you need switches, select an SAI40X10S and use current AirTAC sensors. For sizing, the 40mm bore yields 628 N push at 0.5 MPa; dropping to a 32mm bore reduces push to 402 N, while a 50mm bore increases it to 982 N. If the application requires load holding on air loss, note that the standard cushion only decelerates the piston and does not lock it—you must add an external pilot check valve, or step up to the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X10
- ✓ 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 SI40X10 FAQ
Yes, the AirTAC SI40X10 is discontinued. The direct replacement is the SAI40X10. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 40mm bore, 10mm stroke, 628 N output force, G1/4 port, and mounting dimensions to fit existing fixtures.
The 40mm bore features a G1/4 air port and a 16mm rod. 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, with a theoretical maximum of 128 kgf at 1.0 MPa. Operating speed ranges from 30-800 mm/s.
Request a Quote for the SAI40X10
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X10 replacement — usually within 7-8 hours.