This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X24, 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 SI40X24
The AirTAC Airtac SI40 Standard Cylinder SI40X24 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 24mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X24, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke24 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X24
- 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 SI40X24
The AirTAC SI40X24 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 24mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. Because 24mm is a non-standard stroke, it was supplied as a special order. AirTAC replaced this legacy unit with the SAI40X24, a direct upgrade sharing the exact ISO 15552 mounting interface, output force, and dimensions.
The SAI40X24 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SI40X24 SKU lacks a magnet, so it cannot accept a CS1-B or DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X24 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X24 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X24 |
| Bore size | Ø40 mm |
| Stroke | 24 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 SAI40X24 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 SAI40X24 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 SI40X24
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×24 | 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 SI40X24 Is Used
Short-Stroke Clamping
Ideal for holding light machined parts in a fixture, utilizing the 628N push force at 0.5MPa for secure, brief clamping cycles.
Package Diverting
Provides a fast 24mm actuation to push small cartons off a production line, taking advantage of the 30-800mm/s speed range.
Ejector Mechanism
Serves well in automated assembly to eject small finished components from a tooling die over a compact 24mm travel distance.
Replacing the Airtac SI40 Standard Cylinder SI40X24 with the SAI40X24
To replace the SI40X24, order the SAI40X24. Confirm your ISO 15552 mounting accessory (LB foot, FA flange, or TC trunnion) and the G1/4 port thread (PT, G, or NPT). Since this SKU has no -S magnet, it cannot support position sensing; if you need switches, specify the SAI40X24S. For sizing, the 40mm bore yields 628N push at 0.5MPa; if less force is needed, a 32mm bore provides 402N, or step up to a 50mm bore for 982N. Remember that a standard cylinder drifts on air loss—the cushion only decelerates near stroke end. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X24
- ✓ 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 SI40X24 FAQ
Yes, the AirTAC SI40X24 is discontinued. The direct replacement is the SAI40X24. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 24mm stroke, G1/4 port, and mounting interface.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. It generates 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.
Request a Quote for the SAI40X24
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X24 replacement — usually within 7-8 hours.