This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X800STC, 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 SI40X800STC
The AirTAC Airtac SI40 Standard Cylinder SI40X800STC 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 SAI40X800STC, 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 → SAI40X800STC
- 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 SI40X800STC
The AirTAC SI40X800STC is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke and TC trunnion mount. Delivering 628 N push at 0.5 MPa through a G1/4 port, it is replaced by the SAI40X800STC. This direct SAI upgrade matches the exact bore, stroke, force, port and ISO 15552 mounting interface of the legacy unit.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI line lacked. The built-in magnet supports legacy CS1-B/DS1-B sensors, while a Viton H seal option raises operating temperature to 150 C.
Airtac SI40 Standard Cylinder SI40X800STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X800STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X800STC |
| 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 SAI40X800STC 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 SAI40X800STC 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 SI40X800STC
| 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 SI40X800STC Is Used
Long-Stroke Diversion
Drives large package pushers across 800 mm conveyor belts where the 628 N force at 0.5 MPa easily handles light-to-medium cardboard routing.
Pallet Handling Gate
Actuates 800 mm safety gates or routing stops in warehouse logistics, utilizing the TC trunnion mount for pivoting clearance.
Replacing the Airtac SI40 Standard Cylinder SI40X800STC with the SAI40X800STC
To replace this SI40X800STC, order the SAI40X800STC. Verify the ISO 15552 TC trunnion mounting, 40 mm bore, 800 mm stroke, G1/4 port and the -S magnet for CS1-B/DS1-B switches. If you need less force, the 32 mm bore offers 402 N push at 0.5 MPa; for more, the 50 mm bore provides 982 N. A plain cylinder drifts on air loss because the cushion only decelerates near stroke end, so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. At 800 mm, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X800STC
- ✓ 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 SI40X800STC FAQ
Yes, the SI40X800STC is discontinued. The direct replacement is the SAI40X800STC. It is a true ISO 15552 profile cylinder that matches the 40 mm bore, 800 mm stroke, 628 N force, G1/4 port and TC mounting interface, fitting existing fixtures perfectly.
This double-acting cylinder operates at 30-800 mm/s. It 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 force of 128 kgf at 1.0 MPa. The G1/4 port and M12x1.25 rod thread are fixed by the 40 mm bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X800STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X800STC replacement — usually within 7-8 hours.