This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX115S, 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 SI40AX115S
The AirTAC Airtac SI40 Standard Cylinder SI40AX115S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX115S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX115S
- 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 SI40AX115S
The AirTAC SI40AX115S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 115mm stroke. It features an extruded aluminum barrel, a SUS420J2 stainless piston rod, and delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40AX115S, which matches the exact ISO 15552 mounting interface, G1/4 port size, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This magnet-equipped -S model accepts legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL lock and SAIF valve variants.
Airtac SI40 Standard Cylinder SI40AX115S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX115S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX115S |
| Bore size | Ø40 mm |
| Stroke | 115 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 SAI40AX115S 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 SAI40AX115S 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 SI40AX115S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SI40AX115S Is Used
Package Diverting
Pushes light cartons off a sorting line using 628 N of thrust at 0.5 MPa, with the 115mm stroke clearing side guides cleanly.
Clamp Actuation
Secures aluminum extrusions during machining, utilizing the SUS420J2 stainless rod to resist coolant corrosion.
Pallet Stops
Acts as a pneumatic stop for roller conveyors, safely arresting 32 kg vertical loads within the 115mm travel.
Replacing the Airtac SI40 Standard Cylinder SI40AX115S with the SAI40AX115S
To replace the SI40AX115S, order the SAI40AX115S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the 115mm stroke, and the G1/4 port. Because this unit has the -A rod, confirm if you still need the SUS420J2 stainless steel rod or the default carbon steel. The -S magnet allows position sensing; use legacy CS1-B/DS1-B switches or current AirTAC switches on the SAI. If sizing up or down, neighboring bores are 32mm (402 N push @0.5 MPa) and 50mm (982 N push @0.5 MPa). Note that a plain cylinder drifts without live air; for load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX115S
- ✓ 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 SI40AX115S FAQ
Yes, the AirTAC SI40AX115S is discontinued. The direct replacement is the SAI40AX115S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 115mm stroke, G1/4 port, and mounting footprint.
This 40mm bore cylinder has a G1/4 air port. The thrust ratings are: 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX115S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX115S replacement — usually within 7-8 hours.