This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X45, 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 SI40X45
The AirTAC Airtac SI40 Standard Cylinder SI40X45 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 SAI40X45, 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 → SAI40X45
- 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 SI40X45
The AirTAC SI40X45 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 45mm stroke, delivering 628N push force at 0.5MPa through a G1/4 port. Because this legacy SI unit is end-of-life, AirTAC supplies the SAI40X45 as the direct replacement. It matches the original ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet, so it cannot accept a CS1-B or DS1-B sensor. For high heat, Viton H seals raise the operating range to 150C.
Airtac SI40 Standard Cylinder SI40X45 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X45 |
| 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 SAI40X45 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 SAI40X45 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 SI40X45
| 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 SI40X45 Is Used
Compact Part Ejection
Delivers 628N of push force at 0.5MPa to reliably eject small machined components from a fixture without damaging surface finishes.
Light Clamping
Provides secure hold-down clamping for small plastic injection molded parts during secondary trimming operations.
Replacing the Airtac SI40 Standard Cylinder SI40X45 with the SAI40X45
To replace the discontinued SI40X45, order the SAI40X45. Verify your existing setup matches the ISO 15552 mounting interface, the G1/4 air port, and M12x1.25 rod thread. Since this SKU has no -S magnet, it cannot support position sensing; if you require switches, select an SAI40X45S and use current AirTAC sensors. Sizing both ways: a 32mm bore offers 402N push at 0.5MPa, while a 50mm bore yields 982N. A plain cylinder will not hold a load without live air—the cushions only decelerate. For load holding on air loss, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X45
- ✓ 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 SI40X45 FAQ
Yes, the SI40X45 is discontinued. The direct replacement is the AirTAC SAI40X45. It shares the exact same ISO 15552 mounting interface, 40mm bore, 45mm stroke, output force, and G1/4 port, so it drops into existing fixtures without modification.
This double-acting cylinder uses a G1/4 air port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Request a Quote for the SAI40X45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X45 replacement — usually within 7-8 hours.