This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X430STC, 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 SI40X430STC
The AirTAC Airtac SI40 Standard Cylinder SI40X430STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 430mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X430STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke430 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X430STC
- 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 SI40X430STC
The AirTAC SI40X430STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 430mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X430STC, a direct upgrade retaining the exact ISO 15552 mounting interface, TC trunnion mount, and M12x1.25 rod thread.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line, and its magnet works with current AirTAC switches instead of the legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X430STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X430STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X430STC |
| Bore size | Ø40 mm |
| Stroke | 430 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 SAI40X430STC 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 SAI40X430STC 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 SI40X430STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×430 | 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 SI40X430STC Is Used
Material Diversion
Drives sorting flappers on packaging lines, utilizing the 430mm stroke to push cartons cleanly between adjacent belt lanes.
Vertical Lift Gates
Raises lightweight access gates on automated storage systems, safely handling loads near the 32kg vertical lift threshold.
Component Ejection
Ejects machined parts from CNC fixtures, using the adjustable 27mm air cushions to decelerate the rod smoothly at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X430STC with the SAI40X430STC
To replace the SI40X430STC, order the SAI40X430STC. Confirm the ISO 15552 TC trunnion interface, 40mm bore, 430mm stroke, G1/4 port, and the -S magnet. If you need more force, neighboring bores like 50mm offer 982N push at 0.5MPa; if less is required, 32mm provides 402N. Because the 430mm stroke is long, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X430STC
- ✓ 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 SI40X430STC FAQ
Yes, the SI40X430STC is discontinued. The direct replacement is the SAI40X430STC. It shares the exact ISO 15552 mounting interface, 40mm bore, 430mm stroke, output force, and G1/4 port, fitting existing TC trunnion fixtures directly.
This 40mm bore double-acting cylinder uses a G1/4 air port and features a 16mm rod with an M12x1.25 thread. The thrust is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X430STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X430STC replacement — usually within 7-8 hours.