This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X510, 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 SI40X510
The AirTAC Airtac SI40 Standard Cylinder SI40X510 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 510mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X510, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke510 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X510
- 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 SI40X510
The AirTAC SI40X510 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 510 mm stroke, delivering 628 N push force at 0.5 MPa. The direct replacement is the SAI40X510, sharing the exact same interface, port, and force. Because this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life, while the SAI family adds SAIL, SAIF, and BSAI variants absent from the SI line. The G1/4 port and M12x1.25 rod thread remain unchanged.
Airtac SI40 Standard Cylinder SI40X510 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X510 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X510 |
| Bore size | Ø40 mm |
| Stroke | 510 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 SAI40X510 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 SAI40X510 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 SI40X510
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×510 | 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 SI40X510 Is Used
Material Diversion
Actuates routing gates on packaging lines using the 628 N push force, with the 510 mm stroke providing the reach needed to clear wider product lanes.
Long-Reach Ejection
Pushes machined parts out of a fixture over a 510 mm distance, requiring external guide rails to avoid rod bending during the extended cycle.
Replacing the Airtac SI40 Standard Cylinder SI40X510 with the SAI40X510
To replace the SI40X510, order the SAI40X510 and confirm the ISO 15552 mounting interface, G1/4 port, and 510 mm stroke. This non-magnet SKU cannot take a CS1-B or DS1-B sensor; if sensing is needed, specify an SAI model with the S suffix. When sizing, neighboring bores offer different forces: the 32 mm bore provides 402 N push at 0.5 MPa, while the 50 mm bore yields 982 N. A plain cylinder does not hold load on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for holding. Because the 510 mm stroke is long, use an external guide to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X510
- ✓ 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 SI40X510 FAQ
Yes, the SI40X510 is discontinued. The direct replacement is the SAI40X510. It is dimensionally interchangeable per ISO 15552, maintaining the same 40 mm bore, 510 mm stroke, force, G1/4 port, and mounting accessories.
The 40 mm bore provides 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and it uses a G1/4 port with a 27 mm adjustable cushion.
Request a Quote for the SAI40X510
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X510 replacement — usually within 7-8 hours.