This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X863, 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 SI40X863
The AirTAC Airtac SI40 Standard Cylinder SI40X863 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 863mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X863, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke863 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X863
- 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 SI40X863
The AirTAC SI40X863 is a discontinued double-acting ISO 15552 profile cylinder with an 863 mm stroke. Delivering 628 N push force at 0.5 MPa through a G1/4 port, it is replaced by the SAI40X863. This direct successor matches the bore, stroke, force, port and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet, so it cannot take a CS1-B/DS1-B sensor. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI40 Standard Cylinder SI40X863 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X863 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X863 |
| Bore size | Ø40 mm |
| Stroke | 863 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 SAI40X863 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 SAI40X863 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 SI40X863
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×863 | 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 SI40X863 Is Used
Package Diversion
Drives sorting pop-up arms on packaging lines, utilizing the 628 N push force at 0.5 MPa to deflect cartons at high speeds.
Long-Reach Ejection
Pushes machined parts out of a CNC enclosure, requiring external guides to prevent rod bending over the 863 mm extension.
Replacing the Airtac SI40 Standard Cylinder SI40X863 with the SAI40X863
To replace the SI40X863, order the SAI40X863. Verify the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port, and the M12x1.25 rod thread. Because this 863 mm stroke exceeds 300 mm, use external guides to prevent rod bending and side-load damage. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. This non-magnet SKU cannot accept a sensor. The air cushion only decelerates; it does not hold load on air loss. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X863
- ✓ 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 SI40X863 FAQ
Yes, the SI40X863 is discontinued. The direct replacement is the SAI40X863. It shares the same ISO 15552 mounting interface, 40 mm bore, 863 mm stroke, output force, G1/4 port and mounting accessories, fitting directly into existing fixtures.
The G1/4 port bore delivers 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 max of 128 kgf at 1.0 MPa. The 863 mm stroke operates at 30-800 mm/s with a 27 mm adjustable air cushion at both ends.
Request a Quote for the SAI40X863
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X863 replacement — usually within 7-8 hours.