This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX190S, 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 SI40BX190S
The AirTAC Airtac SI40 Standard Cylinder SI40BX190S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 190mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX190S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke190 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX190S
- 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 SI40BX190S
The AirTAC SI40BX190S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 190mm stroke, G1/4 port and a SUS304 stainless steel rod. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40BX190S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke and output force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The built-in magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve and BSAI clamp variants.
Airtac SI40 Standard Cylinder SI40BX190S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX190S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX190S |
| Bore size | Ø40 mm |
| Stroke | 190 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 SAI40BX190S 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 SAI40BX190S 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 SI40BX190S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×190 | 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 SI40BX190S Is Used
Light Clamping Fixture
Secures light aluminum components during machining, relying on the 528N pull force and adjustable cushions.
Replacing the Airtac SI40 Standard Cylinder SI40BX190S with the SAI40BX190S
To replace the SI40BX190S, order the SAI40BX190S. Confirm the ISO 15552 mounting interface, the 40mm bore, 190mm stroke, G1/4 port (PT/G/NPT thread), the SUS304 stainless rod, and the -S magnet for CS1-B/DS1-B switches. For sizing, a 50mm bore offers 982N push at 0.5MPa, while a 32mm bore yields 402N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX190S
- ✓ 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 SI40BX190S FAQ
Yes, the SI40BX190S is discontinued. The direct replacement is the SAI40BX190S. It shares the identical ISO 15552 mounting interface, 40mm bore, 190mm stroke, G1/4 port, and force ratings, fitting existing fixtures perfectly.
It features a G1/4 port. The force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX190S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX190S replacement — usually within 7-8 hours.