This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X275, 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 SI40X275
The AirTAC Airtac SI40 Standard Cylinder SI40X275 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 275mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X275, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke275 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X275
- 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 SI40X275
The AirTAC SI40X275 is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore and 275mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X275. This direct upgrade shares identical mounting, bore, and force specs, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a CS1-B/DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X275 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X275 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X275 |
| Bore size | Ø40 mm |
| Stroke | 275 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 SAI40X275 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 SAI40X275 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 SI40X275
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SI40X275 Is Used
Package Diversion
Pushes medium-weight cartons on packaging lines using 628N push force at 0.5MPa.
Clamp Actuation
Secures workpieces during machining, relying on the 275mm stroke to clear the work area.
Gate Control
Operates sorting gates in material handling hubs with a 32kg vertical lift capacity.
Replacing the Airtac SI40 Standard Cylinder SI40X275 with the SAI40X275
To replace the SI40X275, order the SAI40X275. Verify the ISO 15552 interface, 40mm bore, 275mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. This non-magnet SKU cannot support sensing. For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. At 275mm stroke, ensure guide support to prevent rod bending and side loads. The cushion only decelerates; use an external rod lock or pilot check valve for load holding, or explore SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X275
- ✓ 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 SI40X275 FAQ
Yes, the AirTAC SI40X275 is discontinued. The direct replacement is the SAI40X275, sharing the same ISO 15552 mounting interface, 40mm bore, 275mm stroke, force, and G1/4 port.
It features a G1/4 port. Force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa.
Request a Quote for the SAI40X275
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X275 replacement — usually within 7-8 hours.