This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX175S, 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 SI40AX175S
The AirTAC Airtac SI40 Standard Cylinder SI40AX175S 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 SAI40AX175S, 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 → SAI40AX175S
- 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 SI40AX175S
The AirTAC SI40AX175S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 175mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, its direct replacement is the SAI40AX175S, which shares identical mounting and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless rod, while the -S magnet pairs with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX175S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX175S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX175S |
| 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 SAI40AX175S 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 SAI40AX175S 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 SI40AX175S
| 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 SI40AX175S Is Used
Mid-Force Actuation
Drives 40mm bore clamps and mid-power actuators requiring 628N push force at 0.5MPa with a 175mm travel range.
Package Diversion
Actuates routing gates and pushers on packaging lines, utilizing the 30-800mm/s speed range for rapid sorting.
Stainless Rod Use
The SUS420J2 stainless rod suits humid warehousing environments where moisture might corrode standard carbon steel.
Replacing the Airtac SI40 Standard Cylinder SI40AX175S with the SAI40AX175S
To replace this SI40AX175S, order the SAI40AX175S. Confirm the ISO 15552 interface, 175mm stroke, G1/4 port (PT/G/NPT), and your mounting accessory. The -A denotes a SUS420J2 stainless rod and -S indicates the magnet for CS1-B/DS1-B switches. For higher force, the 50mm bore yields 982N push at 0.5MPa; for less, the 32mm bore yields 402N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX175S
- ✓ 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 SI40AX175S FAQ
Yes, the SI40AX175S is discontinued. The direct replacement is the SAI40AX175S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 175mm stroke, 628N force, G1/4 port, and mounting interface.
The G1/4 port feeds a 40mm bore yielding 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a 128kgf max at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX175S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX175S replacement — usually within 7-8 hours.