This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX375S, 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 SI40AX375S
The AirTAC Airtac SI40 Standard Cylinder SI40AX375S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 375mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX375S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke375 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX375S
- 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 SI40AX375S
The AirTAC SI40AX375S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 375mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX375S, matching the interface, stroke, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -A suffix specifies a SUS420J2 stainless rod, and -S adds a magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX375S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX375S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX375S |
| Bore size | Ø40 mm |
| Stroke | 375 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 SAI40AX375S 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 SAI40AX375S 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 SI40AX375S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×375 | 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 SI40AX375S Is Used
Package Diverting
Ideal for pushing medium-weight cartons off a belt line, utilizing the 628N push force and 375mm reach to clear the lane safely.
Pallet Stopper Gate
Acts as a pneumatic stop for pallets entering a wrap station, with the SUS420J2 stainless rod resisting humidity in damp logistics environments.
Component Ejection
Ejects machined parts from a fixture over a 375mm distance, where the adjustable 27mm air cushions decelerate the rod smoothly at cycle end.
Replacing the Airtac SI40 Standard Cylinder SI40AX375S with the SAI40AX375S
To replace the SI40AX375S, order the SAI40AX375S. Confirm the ISO 15552 mounting interface, G1/4 port, M12x1.25 rod thread, and -S magnet for current AirTAC switches. If you need more force, the 50mm bore offers 982N push at 0.5MPa; for less, the 32mm bore provides 402N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. With a 375mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX375S
- ✓ 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 SI40AX375S FAQ
Yes, the SI40AX375S is discontinued. The direct replacement is the SAI40AX375S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 375mm stroke, force, G1/4 port, and mounting accessories.
The G1/4 port feeds a 16mm rod delivering 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX375S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX375S replacement — usually within 7-8 hours.