This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X215S, 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 SI40X215S
The AirTAC SI40 Standard Cylinder SI40X215S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 215mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X215S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke215 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X215S
- 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 SI40X215S
The AirTAC SI40X215S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 215 mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa, using a G1/4 port and M12x1.25 rod thread. The direct replacement is the SAI40X215S, matching the interface, force, and mounting exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. For applications needing load holding on air loss, the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X215S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X215S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X215S |
| Bore size | Ø40 mm |
| Stroke | 215 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 SAI40X215S 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 SAI40X215S 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 SI40X215S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×215 | 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 SI40X215S Is Used
Component Clamping
Secures mid-weight machined parts during CNC milling, utilizing the 628 N push force at 0.5 MPa for rigid holding.
Package Diverting
Actuates sorting gates on packaging lines, where the 215 mm stroke provides sufficient travel to redirect boxes.
Replacing the Airtac SI40 Standard Cylinder SI40X215S with the SAI40X215S
To replace the SI40X215S, order the SAI40X215S keeping the same ISO 15552 mounting, 40 mm bore, 215 mm stroke, G1/4 port, and magnet. The SAI uses current AirTAC switches for the -S magnet, replacing legacy CS1-B/DS1-B sensors. For sizing, a 32 mm bore offers 402 N push at 0.5 MPa, while a 50 mm bore provides 982 N. Note that a plain cylinder drifts without live air; use an external pilot check valve or the SAIL/BSAI lock variant for load holding. At 215 mm stroke, guide side-loads to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X215S
- ✓ 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 SI40X215S FAQ
Yes, the SI40X215S is discontinued. The direct replacement is the SAI40X215S, which shares the identical ISO 15552 mounting interface, 40 mm bore, 215 mm stroke, output force, G1/4 port, and accessories.
It has a G1/4 port. Force ratings are 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 max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X215S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X215S replacement — usually within 7-8 hours.