This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X280SH, 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 SI40X280SH
The AirTAC Airtac SI40 Standard Cylinder SI40X280SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 280mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X280SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X280SH
- 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 SI40X280SH
The AirTAC SI40X280SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 280mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X280SH, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -SH configuration includes a high-temp Viton H seal (0-150C) and a piston magnet for CS1-B/DS1-B switches.
Airtac SI40 Standard Cylinder SI40X280SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X280SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X280SH |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAI40X280SH 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 SAI40X280SH 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 SI40X280SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SI40X280SH Is Used
Diverting Gate
Actuates routing flaps on packaging lines, using the 280mm stroke to shift product lanes reliably under continuous cycling.
Carton Ejector
Pushes corrugated cartons off a roller bed; the 628N output at 0.5MPa handles standard packed weights effortlessly.
Clamp Actuator
Secures workpieces in CNC fixtures where the Viton H seal withstands elevated ambient temperatures up to 150C.
Replacing the Airtac SI40 Standard Cylinder SI40X280SH with the SAI40X280SH
To replace the SI40X280SH, order the SAI40X280SH. Confirm the ISO 15552 mounting interface, 40mm bore, 280mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet enables current AirTAC switches, while the -H Viton seal supports 0-150C. If you need more force, the 50mm bore yields 982N push at 0.5MPa; if less is required, the 32mm bore gives 402N. Because the 280mm stroke exceeds 300mm is false here, but always ensure adequate guidance to prevent rod bending under side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X280SH
- ✓ 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 SI40X280SH FAQ
Yes, the SI40X280SH is discontinued. The direct replacement is the SAI40X280SH. It shares the identical ISO 15552 mounting interface, 40mm bore, 280mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while offering an upgraded piston seal.
This double-acting 40mm bore cylinder uses a G1/4 air port. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and 1130N at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X280SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X280SH replacement — usually within 7-8 hours.