This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X105S, 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 SI40X105S
The AirTAC Airtac SI40 Standard Cylinder SI40X105S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 105mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X105S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X105S
- 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 SI40X105S
The AirTAC SI40X105S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 105 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X105S, a direct upgrade sharing the exact same ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants like the SAIL, SAIF, and BSAI that the original SI line lacked.
Airtac SI40 Standard Cylinder SI40X105S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X105S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X105S |
| Bore size | Ø40 mm |
| Stroke | 105 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 SAI40X105S 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 SAI40X105S 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 SI40X105S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×105 | 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 SI40X105S Is Used
Component Clamping
Ideal for mid-range clamping tasks on machining fixtures, utilizing the 628 N push force to secure workpieces firmly during secondary operations.
Package Diverting
Drives diverting arms on packaging lines where a 105 mm stroke pushes cartons to adjacent lanes without overwhelming the system.
Replacing the Airtac SI40 Standard Cylinder SI40X105S with the SAI40X105S
To replace the SI40X105S, order the SAI40X105S and confirm the ISO 15552 mounting interface, 105 mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors, which transitions to current AirTAC switches on the SAI. If sizing up or down, neighboring bores (32 mm or 50 mm) alter the 0.5 MPa force from 402 N to 982 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X105S
- ✓ 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 SI40X105S FAQ
Yes, the SI40X105S is discontinued. The direct replacement is the AirTAC SAI40X105S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 105 mm stroke, force, and G1/4 port, fitting directly into existing fixtures.
The 40 mm bore features a G1/4 air port and provides 628 N push and 528 N pull at 0.5 MPa. At 0.7 MPa it pushes 879 N, and 1130 N at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X105S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X105S replacement — usually within 7-8 hours.