This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X230S, 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 SI40X230S
The AirTAC Airtac SI40 Standard Cylinder SI40X230S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X230S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X230S
- 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 SI40X230S
The AirTAC SI40X230S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 230mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X230S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, port size, and M12x1.25 rod thread.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and self-valve variants (SAIL, SAIF, BSAI) absent in the SI line, while this -S model retains its magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X230S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X230S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X230S |
| Bore size | Ø40 mm |
| Stroke | 230 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 SAI40X230S 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 SAI40X230S 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 SI40X230S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×230 | 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 SI40X230S Is Used
Package Diversion
Actuates routing gates on packaging lines where 628N push force easily deflects standard cardboard cartons.
Clamp Actuation
Drives mid-sized clamping fixtures in CNC machining, utilizing the 230mm stroke to clear the work area for loading.
Replacing the Airtac SI40 Standard Cylinder SI40X230S with the SAI40X230S
To replace the SI40X230S, order the SAI40X230S. Confirm your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/4 air port, and the built-in magnet for position sensing. The 230mm stroke falls within the 1200mm standard limit, but at this length you should verify guide alignment to prevent rod bending under side loads. If you need more force, the neighbouring 50mm bore yields 982N push at 0.5MPa; if less is required, the 32mm bore provides 402N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X230S
- ✓ 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 SI40X230S FAQ
Yes, the AirTAC SI40X230S is discontinued. The direct replacement is the SAI40X230S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 230mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures perfectly.
This 40mm bore double-acting cylinder uses a G1/4 air port and features an M12x1.25 rod thread. It delivers 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 SAI40X230S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X230S replacement — usually within 7-8 hours.