This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X124S, 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 SI40X124S
The AirTAC Airtac SI40 Standard Cylinder SI40X124S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 124mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X124S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke124 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X124S
- 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 SI40X124S
The AirTAC SI40X124S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 124mm stroke, delivering 628N push and 528N pull at 0.5MPa. It is directly replaced by the SAI40X124S, a direct upgrade retaining the same G1/4 port, M12x1.25 rod thread, and mounting interface. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. It also adds SAIL, SAIF, and BSAI variants the SI lacked.
This -S model includes a piston magnet for legacy CS1-B/DS1-B switches. Note that a plain cylinder drifts on air loss; the cushion only decelerates near stroke end, so use an external rod lock or pilot check valve for load holding.
Airtac SI40 Standard Cylinder SI40X124S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X124S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X124S |
| Bore size | Ø40 mm |
| Stroke | 124 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 SAI40X124S 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 SAI40X124S 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 SI40X124S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×124 | 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 SI40X124S Is Used
Package Diversion
Ideal for pushing light to medium cartons on a packaging line, utilizing the 124mm stroke and 628N push force to actuate routing gates cleanly.
Small Part Clamping
Provides reliable holding force for machining or assembly fixtures, where the 40mm bore delivers precise clamping without deforming components.
Vertical Lift Stops
Suitable for lifting or stopping totes up to 32kg in material handling setups, with the built-in magnet confirming position via sensors.
Replacing the Airtac SI40 Standard Cylinder SI40X124S with the SAI40X124S
To replace the SI40X124S, order the SAI40X124S. It drops into existing fixtures per ISO 15552 dimensions, matching the 40mm bore, 124mm stroke, G1/4 port, and M12x1.25 rod thread. Retain your mounting accessory (LB, FA, TC, etc.) and confirm the -S magnet for current AirTAC switches. For sizing, this 40mm bore yields 628N push at 0.5MPa; dropping to a 32mm bore gives 402N, while a 50mm bore gives 982N. Since the stroke is 124mm, guide external rods to prevent side-load bending. A plain SAI does not hold load without live air; for locking needs, consider the SAIL or BSAI variants, or a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X124S
- ✓ 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 SI40X124S FAQ
Yes, the SI40X124S is discontinued. The direct replacement is the SAI40X124S. It shares the same ISO 15552 mounting interface, 40mm bore, 124mm stroke, and G1/4 port, fitting existing fixtures perfectly while offering an upgraded piston seal.
The 40mm bore features a G1/4 air port and 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. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X124S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X124S replacement — usually within 7-8 hours.