This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X115SN, 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 SI40X115SN
The AirTAC Airtac SI40 Standard Cylinder SI40X115SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X115SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X115SN
- 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 SI40X115SN
The AirTAC SI40X115SN is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 115 mm stroke. It features an extruded aluminum barrel, a G1/4 air port, and an M12x1.25 rod thread, generating 628 N push force at 0.5 MPa. AirTAC replaced this EOL unit with the SAI40X115SN, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and porting.
The SAI replacement introduces an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. This configuration includes a piston magnet for legacy CS1-B/DS1-B sensors and an NBR seal rated for -20 to +70 C (a Viton H option raises this to 150 C).
Airtac SI40 Standard Cylinder SI40X115SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X115SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X115SN |
| Bore size | Ø40 mm |
| Stroke | 115 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 SAI40X115SN 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 SAI40X115SN 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 SI40X115SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SI40X115SN Is Used
Component Clamping
Secures mid-weight machined parts in CNC fixtures using 628 N of push force at 0.5 MPa, ensuring rigid holding during milling operations.
Package Diverting
Actuates routing gates on packaging lines with a 115 mm stroke, providing swift and reliable redirection of boxes up to 32 kg.
Vertical Lift Stops
Raises lightweight pallet stops in distribution hubs, utilizing the 528 N pull force to control material flow safely.
Replacing the Airtac SI40 Standard Cylinder SI40X115SN with the SAI40X115SN
To replace the discontinued SI40X115SN, order the SAI40X115SN direct, confirming the ISO 15552 mounting interface, 115 mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet and -N NBR seal carry over directly. When sizing both ways, a 32 mm bore neighbor offers 402 N push at 0.5 MPa, while a 50 mm bore provides 982 N; this 40 mm bore yields 628 N push and 528 N pull at 0.5 MPa. Remember a standard cylinder drifts without live air—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variant. At 115 mm stroke side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X115SN
- ✓ 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 SI40X115SN FAQ
Yes, the AirTAC SI40X115SN is discontinued. The direct replacement is the SAI40X115SN. It shares the exact ISO 15552 mounting interface, 40 mm bore, 115 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 air port and provides 628 N push and 528 N pull at 0.5 MPa. At 0.7 MPa push is 879 N, at 0.9 MPa it is 1130 N, and the theoretical maximum is 128 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X115SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X115SN replacement — usually within 7-8 hours.