This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X175S, 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 SI40X175S
The AirTAC Airtac SI40 Standard Cylinder SI40X175S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 175mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X175S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke175 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X175S
- 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 SI40X175S
The AirTAC SI40X175S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 175 mm stroke. Delivering 628 N push force at 0.5 MPa via a G1/4 port, it is directly replaced by the SAI40X175S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures perfectly.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF and BSAI variants absent from the SI line. The -S suffix indicates a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X175S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X175S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X175S |
| Bore size | Ø40 mm |
| Stroke | 175 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 SAI40X175S 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 SAI40X175S 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 SI40X175S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×175 | 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 SI40X175S Is Used
Package Diversion
Ideal for pushing 30 kg cartons on packaging lines, utilizing the 175 mm stroke and 628 N thrust at 0.5 MPa for reliable lateral sorting.
Clamp Actuation
Secures medium-weight workpieces in machining fixtures, where the 40 mm bore's 528 N pull force at 0.5 MPa provides firm holding without deformation.
Gate Control
Drives lightweight material handling gates and stops, with the 175 mm stroke offering ample travel and the G1/4 port ensuring rapid response.
Replacing the Airtac SI40 Standard Cylinder SI40X175S with the SAI40X175S
To replace the SI40X175S, order the SAI40X175S. Verify the ISO 15552 mounting interface, 40 mm bore, 175 mm stroke, G1/4 port (PT/G/NPT thread options), M12x1.25 rod thread, and the -S magnet for CS1-B/DS1-B switches. The SAI drops into the same foot, flange or trunnion fixtures. For sizing, a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. Note that a plain cylinder drifts on air loss; the 27 mm adjustable cushion only decelerates near stroke ends. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SAIF variant integrates a 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X175S
- ✓ 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 SI40X175S FAQ
Yes, the SI40X175S is discontinued. The direct replacement is the SAI40X175S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 175 mm stroke, 628 N force, G1/4 port and mounting interface.
The 40 mm bore features a G1/4 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 SAI40X175S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X175S replacement — usually within 7-8 hours.