This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X860S, 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 SI40X860S
The AirTAC Airtac SI40 Standard Cylinder SI40X860S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 860mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X860S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke860 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X860S
- 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 SI40X860S
The AirTAC SI40X860S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 860 mm stroke. It delivers 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X860S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI upgrade features a new 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.
Airtac SI40 Standard Cylinder SI40X860S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X860S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X860S |
| Bore size | Ø40 mm |
| Stroke | 860 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 SAI40X860S 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 SAI40X860S 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 SI40X860S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×860 | 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 SI40X860S Is Used
Vertical Material Lift
Elevates 32 kg tote bins in pick modules, relying on external linear guides to prevent rod bending over the 860 mm travel.
Guard Door Actuation
Opens safety enclosures on automated cells, benefiting from the adjustable end cushions to decelerate the moving barrier.
Replacing the Airtac SI40 Standard Cylinder SI40X860S with the SAI40X860S
To replace the SI40X860S, order the SAI40X860S. Confirm the ISO 15552 mounting interface, the 40 mm bore, the 860 mm stroke, the G1/4 port (PT/G/NPT thread), and the -S magnet for CS1-B/DS1-B legacy sensors (the SAI uses current AirTAC switches). Sizing both ways: a 32 mm bore gives 402 N push at 0.5 MPa, while a 50 mm bore gives 982 N. Because this is an 860 mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X860S
- ✓ 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 SI40X860S FAQ
Yes, the SI40X860S is discontinued. The direct replacement is the SAI40X860S. It shares the same ISO 15552 mounting interface, 40 mm bore, 860 mm stroke, output force, G1/4 port and accessories, fitting existing fixtures perfectly.
The 40 mm bore uses a G1/4 port. It generates 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 SAI40X860S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X860S replacement — usually within 7-8 hours.