This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX175S, 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 SI40BX175S
The AirTAC Airtac SI40 Standard Cylinder SI40BX175S 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 SAI40BX175S, 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 → SAI40BX175S
- 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 SI40BX175S
The AirTAC SI40BX175S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 175mm stroke, and a SUS304 stainless steel rod. It delivers 628N push force at 0.5MPa. The direct replacement is the SAI40BX175S, sharing the same interface, G1/4 port, and mounting hardware.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -S magnet works with CS1-B/DS1-B switches; SAI uses current switches.
Airtac SI40 Standard Cylinder SI40BX175S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX175S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX175S |
| 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 SAI40BX175S 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 SAI40BX175S 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 SI40BX175S
| 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 SI40BX175S Is Used
Stainless Rod Diverter
Ideal for pushing light packages on a washdown conveyor line, utilizing the 175mm stroke and SUS304 rod for corrosion resistance.
Small Part Clamp
Clamps thin workpieces in machining fixtures, providing 628N of holding force at 0.5MPa without marking the part.
Replacing the Airtac SI40 Standard Cylinder SI40BX175S with the SAI40BX175S
To replace the SI40BX175S, order the SAI40BX175S. Confirm the ISO 15552 mounting interface, 40mm bore, 175mm stroke, G1/4 port, and M12x1.25 rod thread. The -B rod is SUS304 stainless, and the -S magnet works with CS1-B/DS1-B switches. Sizing both ways: a 32mm bore yields 402N push, while a 50mm bore yields 982N. For load holding, note a plain cylinder drifts on air loss; use an external rod lock or SAIL/BSAI variant. For 175mm strokes, check guide rods to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX175S
- ✓ 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 SI40BX175S FAQ
Yes, the SI40BX175S is discontinued. The direct replacement is the SAI40BX175S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 175mm stroke, G1/4 port, and mounting interface.
It has a G1/4 port. Force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and a theoretical max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX175S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX175S replacement — usually within 7-8 hours.