This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X890S, 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 SI40X890S
The AirTAC Airtac SI40 Standard Cylinder SI40X890S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 890mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X890S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke890 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X890S
- 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 SI40X890S
The AirTAC SI40X890S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 890 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X890S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Your -S suffix denotes a piston magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X890S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X890S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X890S |
| Bore size | Ø40 mm |
| Stroke | 890 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 SAI40X890S 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 SAI40X890S 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 SI40X890S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×890 | 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 SI40X890S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 890 mm reach, utilizing the 628 N thrust to redirect heavy goods smoothly.
Vertical Material Lift
Elevates components up to 32 kg in storage racks, benefiting from the ISO 15552 mounting interface for rigid fixture integration.
Extended Reach Clamping
Actuates clamps across wide machine beds, relying on adjustable air cushions to decelerate the rod gently at full extension.
Replacing the Airtac SI40 Standard Cylinder SI40X890S with the SAI40X890S
To replace the SI40X890S, order the SAI40X890S. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the -S magnet for current AirTAC switches. If you need more force, the 50 mm bore yields 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore gives 402 N. Because the 890 mm stroke invites rod bending, use an external guide to prevent side loads. A plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X890S
- ✓ 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 SI40X890S FAQ
Yes, the SI40X890S is discontinued. The direct replacement is the SAI40X890S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 890 mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder operates at 30-800 mm/s with a G1/4 port and M12x1.25 rod thread. Force ratings are 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 maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X890S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X890S replacement — usually within 7-8 hours.