This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X400SH, 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 SI40X400SH
The AirTAC Airtac SI40 Standard Cylinder SI40X400SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X400SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X400SH
- 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 SI40X400SH
The AirTAC SI40X400SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 400mm stroke, G1/4 port and M12x1.25 rod thread. Delivering 628N push at 0.5MPa, it is replaced by the SAI40X400SH. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -H suffix denotes a Viton seal, extending operating temperature to 0-150C. The -S magnet supports CS1-B/DS1-B switches.
The SAI family adds SAIL, SAIF and BSAI lock variants absent in the SI line. Note that air cushions only decelerate; they do not hold loads on air loss.
Airtac SI40 Standard Cylinder SI40X400SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X400SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X400SH |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAI40X400SH 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 SAI40X400SH 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 SI40X400SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SI40X400SH Is Used
Material Diversion
Actuates sorting gates on packaging lines, utilizing the 400mm stroke to clear product lanes while handling the 628N push load at 0.5 MPa.
Vertical Lifting
Elevates components up to 32kg in pick-and-place cells, benefiting from the Viton H high-temperature seal in heated environments.
Long-Reach Ejection
Pushes molded parts out of machinery across a 400mm gap, requiring external guide rails to prevent rod bending during extension.
Replacing the Airtac SI40 Standard Cylinder SI40X400SH with the SAI40X400SH
To replace the SI40X400SH, order the SAI40X400SH. It drops directly into existing fixtures via the identical ISO 15552 mounting interface, matching the 40mm bore, 400mm stroke, G1/4 port and M12x1.25 thread. Retain your mounting accessory (LB, FA, TC, etc.) and confirm the -S magnet for current AirTAC switches, plus the -H Viton seal for 0-150C environments. For force sizing, this bore yields 628N push and 528N pull at 0.5MPa; if undersized, the adjacent 50mm bore offers 982N push. Because the 400mm stroke exceeds 300mm, use an external guide to prevent rod bending and side-load wear. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X400SH
- ✓ 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 SI40X400SH FAQ
Yes, the AirTAC SI40X400SH is discontinued. The direct replacement is the SAI40X400SH. It shares the identical ISO 15552 mounting interface, 40mm bore, 400mm stroke, output force and G1/4 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 40mm bore uses a G1/4 air port and M12x1.25 rod thread. It generates 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X400SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X400SH replacement — usually within 7-8 hours.