This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X800SN, 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 SI40X800SN
The AirTAC SI40 Standard Cylinder SI40X800SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X800SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X800SN
- 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 SI40X800SN
The AirTAC SI40X800SN is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke and a 40 mm bore, delivering 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced it with the SAI40X800SN, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, and output force. The SAI features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. It also adds SAIL, SAIF, and BSAI lock variants absent from the legacy line. This -SN unit has an NBR seal (-20 to +70 C) and a piston magnet for CS1-B/DS1-B switches.
The SAI family retains identical thrust ratings and interface dimensions, ensuring a seamless fixture swap. Note that a plain cylinder does not hold load without live air; the cushion only decelerates. For holding, use an external rod lock or the SAIL/BSAI variant.
Airtac SI40 Standard Cylinder SI40X800SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X800SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X800SN |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40X800SN 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 SAI40X800SN 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 SI40X800SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40X800SN Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 800 mm travel, relying on the adjustable end cushions to decelerate the 40 mm bore smoothly.
Vertical Material Lift
Raises lightweight totes or bins up to 32 kg in pick modules, safely operating within the 377 N working load limit at 0.5 MPa.
Extended Reach Gating
Actuates safety gates or machine guards at a distance, using the G1/4 port and ISO 15552 mounts for rigid fixture integration.
Replacing the Airtac SI40 Standard Cylinder SI40X800SN with the SAI40X800SN
To replace the discontinued SI40X800SN, order the SAI40X800SN. Confirm the ISO 15552 mounting interface, 40 mm bore, 800 mm stroke, G1/4 port (PT/G/NPT thread), and your mounting accessory (LB, FA, TC, etc.). The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. The -N denotes the standard NBR seal (-20 to +70 C); choose Viton H for high heat. At 800 mm, prevent rod bending by adding external guides to absorb side loads. Output is 628 N push at 0.5 MPa; if undersized, step up to a 50 mm bore (982 N). Because air cushions only decelerate, use a pilot check valve or the SAIL lock variant to hold loads safely.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X800SN
- ✓ 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 SI40X800SN FAQ
Yes, the AirTAC SI40X800SN is discontinued. The direct replacement is the SAI40X800SN. It shares the identical ISO 15552 mounting interface, 40 mm bore, 800 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 40 mm bore uses a G1/4 air port and an M12x1.25 rod thread. 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, and a theoretical maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X800SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X800SN replacement — usually within 7-8 hours.