This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX75, 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 SI40AX75
The AirTAC Airtac SI40 Standard Cylinder SI40AX75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX75
- 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 SI40AX75
The AirTAC SI40AX75 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40AX75, matching the interface, force and mounting exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This SKU has no magnet (-S omitted), so it cannot take a sensor. The SUS420J2 stainless rod resists corrosion.
Airtac SI40 Standard Cylinder SI40AX75 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX75 |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAI40AX75 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 SAI40AX75 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 SI40AX75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SI40AX75 Is Used
Compact Part Ejection
Uses the 628N push force at 0.5MPa to reliably kick machined components out of a fixture in tight machinery spaces.
Package Diverting
Executes 75mm strokes to push light cartons off a main conveyor belt line onto a sorting branch at speed.
Replacing the Airtac SI40 Standard Cylinder SI40AX75 with the SAI40AX75
To replace the SI40AX75, order the SAI40AX75. Confirm the ISO 15552 mounting interface, 40mm bore, 75mm stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory. Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor; order a magnet-equipped SAI40AS75 if position detection is needed. For sizing, the 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. The plain cylinder does not hold load without live air; for drift prevention use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The 75mm stroke keeps side-load risk low, but always guide the payload to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX75
- ✓ 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 SI40AX75 FAQ
Yes, the SI40AX75 is discontinued. The direct replacement is the SAI40AX75. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 75mm stroke, G1/4 port, and mounting hardware so it fits existing fixtures perfectly.
The G1/4 port feeds a 16mm rod. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI40AX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX75 replacement — usually within 7-8 hours.