This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X110, 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 SI40X110
The AirTAC Airtac SI40 Standard Cylinder SI40X110 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X110, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X110
- 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 SI40X110
The AirTAC SI40X110 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 110 mm stroke. Delivering 628 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI40X110. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, output force and accessories, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. For load holding, explore the SAIL lock or BSAI clamp-lock variants.
Airtac SI40 Standard Cylinder SI40X110 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X110 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X110 |
| Bore size | Ø40 mm |
| Stroke | 110 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 SAI40X110 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 SAI40X110 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 SI40X110
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×110 | 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 SI40X110 Is Used
Small Part Ejection
Uses the 628 N push force at 0.5 MPa to reliably push machined components out of a fixture on an automated lathe.
Package Diversion
Actuates a routing gate on a packaging line, where the 110 mm stroke provides just enough travel to redirect boxes.
Light Lift Gates
Operates lightweight access doors or safety guards, safely moving loads up to the 32 kg vertical lift threshold.
Replacing the Airtac SI40 Standard Cylinder SI40X110 with the SAI40X110
To replace the discontinued SI40X110, order the SAI40X110. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the 110 mm stroke, and the G1/4 port (PT, G or NPT thread). Because this SKU has no -S magnet, it cannot support position sensing; if you need switches, select a magnet-equipped SAI40X110S and use current AirTAC switches. When sizing, neighbouring bores offer alternatives: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore provides 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for held loads use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X110
- ✓ 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 SI40X110 FAQ
Yes, the SI40X110 is discontinued. The direct replacement is the AirTAC SAI40X110. It features the same ISO 15552 mounting interface, 40 mm bore, 110 mm stroke, output force and G1/4 port, so it drops directly into existing setups.
The 40 mm bore features a G1/4 air port and a 16 mm rod. It delivers 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. Operating speed is 30-800 mm/s.
Request a Quote for the SAI40X110
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X110 replacement — usually within 7-8 hours.