This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X465S, 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 SI40X465S
The AirTAC Airtac SI40 Standard Cylinder SI40X465S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 465mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X465S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke465 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X465S
- 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 SI40X465S
The AirTAC SI40X465S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 465mm stroke, delivering 628 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI40X465S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The original SI -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors, while the SAI replacement family uses current AirTAC switches. You can configure the SAI with various rod materials (carbon steel, SUS420J2, SUS304) and seal options like Viton H for high-temperature environments up to 150 C. If your fixture requires load holding on air loss, note that a plain cylinder drifts and its cushion only decelerates; you would need the SAIL lock or BSAI clamp-lock variants the SI line lacked.
Airtac SI40 Standard Cylinder SI40X465S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X465S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X465S |
| Bore size | Ø40 mm |
| Stroke | 465 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 SAI40X465S 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 SAI40X465S 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 SI40X465S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×465 | 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 SI40X465S Is Used
Package Diversion
Actuates routing gates on packaging lines, utilizing the 628 N push force at 0.5 MPa to smoothly redirect cartons at high cycling speeds.
Vertical Material Lift
Raises and lowers light platens up to 32 kg, requiring an external guide to manage side loads over the extended 465mm stroke.
Clamp Actuation
Secures workpieces in machining fixtures, where the adjustable 27mm air cushions decelerate the 16mm rod at stroke ends to prevent impact damage.
Replacing the Airtac SI40 Standard Cylinder SI40X465S with the SAI40X465S
To replace the discontinued SI40X465S, order the SAI40X465S and confirm the ISO 15552 mounting interface, 40mm bore, 465mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory (LB, FA, TC, etc.). Retain the -S magnet option for position sensing. When sizing, you can step up to a 50mm bore for greater thrust (982 N push at 0.5 MPa) or down to a 32mm bore (402 N) if the load is lighter. Because the 465mm stroke is relatively long, prevent rod bending and premature seal wear by using an external guide to absorb side loads. Remember that a standard cylinder does not hold load without live air; for safety against drifting, specify an external pilot check valve or choose the SAIL air-released lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X465S
- ✓ 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 SI40X465S FAQ
Yes, the SI40X465S is discontinued. The direct replacement is the AirTAC SAI40X465S. It shares the identical ISO 15552 mounting interface, 40mm bore, 465mm stroke, output force, G1/4 port, and accessories, fitting directly into existing fixtures.
The G1/4 port is fixed by the 40mm bore. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, at 0.9 MPa push is 1130 N, and the theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X465S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X465S replacement — usually within 7-8 hours.