This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X115S, 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 SI40X115S
The AirTAC Airtac SI40 Standard Cylinder SI40X115S 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 SAI40X115S, 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 → SAI40X115S
- 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 SI40X115S
The AirTAC SI40X115S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 115 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X115S, a direct upgrade sharing the exact same ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and self-valve variants (SAIL, SAIF, BSAI) absent in the SI line. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X115S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X115S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X115S |
| 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 SAI40X115S 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 SAI40X115S 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 SI40X115S
| 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 SI40X115S Is Used
Clamp Actuation
Ideal for mid-force clamping of machined parts, providing reliable 628 N holding pressure at 0.5 MPa for CNC fixturing.
Package Diverting
Drives sorting pop-up arms on packaging lines, where the 115 mm stroke and 32 kg vertical lift capacity move products efficiently.
Component Insertion
Presses bearings or pins into housings on automated assembly machinery, utilizing adjustable end cushions for smooth deceleration.
Replacing the Airtac SI40 Standard Cylinder SI40X115S with the SAI40X115S
To replace the SI40X115S, order the SAI40X115S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the G1/4 port thread (PT/G/NPT), and the -S magnet for current AirTAC switches. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. If your application requires load holding on air loss, note that a plain cylinder drifts and the air cushion only decelerates; you will need an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. The 115 mm stroke is under the 300 mm threshold, so rod-bending side-load risks are minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X115S
- ✓ 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 SI40X115S FAQ
Yes, the SI40X115S is discontinued. The direct replacement is the AirTAC SAI40X115S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 115 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40 mm bore features a G1/4 air port and M12x1.25 rod thread. Force output is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X115S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X115S replacement — usually within 7-8 hours.