This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX45S, 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 SI40AX45S
The AirTAC Airtac SI40 Standard Cylinder SI40AX45S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 45mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX45S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX45S
- 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 SI40AX45S
The AirTAC SI40AX45S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 45mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX45S, a direct upgrade retaining the exact interface, bore, stroke, force and mounting.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU includes a SUS420J2 stainless steel rod and a piston magnet for CS1-B/DS1-B switches.
Airtac SI40 Standard Cylinder SI40AX45S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX45S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX45S |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAI40AX45S 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 SAI40AX45S 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 SI40AX45S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SI40AX45S Is Used
Compact Part Ejection
Uses the 628N push force to eject small machined components from a fixture quickly within a tight 45mm stroke envelope.
Package Diverting
Actuates a diverter arm on a packaging line, where the 32kg vertical lift capacity easily handles lightweight product redirection.
Clamp Actuation
Drives a secondary clamping mechanism in an assembly cell, benefiting from the SUS420J2 stainless rod in mildly corrosive environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX45S with the SAI40AX45S
To replace the SI40AX45S, order the SAI40AX45S. Confirm the ISO 15552 mounting interface, 40mm bore, 45mm stroke, G1/4 port (PT/G/NPT thread) and mounting accessory match your fixture. The SAI family expands options with SAIL air-released lock, SAIF built-in 4M valve and BSAI clamp-lock variants. If sizing up, the 50mm bore offers 982N at 0.5MPa; if sizing down, the 32mm bore provides 402N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX45S
- ✓ 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 SI40AX45S FAQ
Yes, the AirTAC SI40AX45S is discontinued. The direct replacement is the SAI40AX45S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 45mm stroke, G1/4 port and mounting interface.
This 40mm bore double-acting cylinder uses 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX45S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX45S replacement — usually within 7-8 hours.