This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX150S, 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 SI50 Standard Cylinder SI50BX150S
The AirTAC Airtac SI50 Standard Cylinder SI50BX150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX150S
- 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 SI50 Standard Cylinder SI50BX150S
The AirTAC SI50BX150S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 150mm stroke. It delivers a push force of 982 N at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50BX150S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The B suffix on this model denotes a SUS304 stainless piston rod for corrosion resistance, and the -S indicates a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50BX150S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX150S |
| Bore size | Ø50 mm |
| Stroke | 150 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50BX150S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50BX150S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50BX150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SI50 Standard Cylinder SI50BX150S Is Used
Package Diversion
Pushes cartons on packaging lines using the 982 N push force, with the SUS304 rod resisting humid washdown environments.
Clamp Actuation
Secures mid-weight workpieces during machining, relying on the 825 N pull force at 0.5 MPa for reliable retraction.
Replacing the Airtac SI50 Standard Cylinder SI50BX150S with the SAI50BX150S
To replace the SI50BX150S, order the SAI50BX150S. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the -S magnet. The SAI family also adds SAIL, SAIF, and BSAI lock/valve variants if your fixture needs them. Sizing both ways: this 50mm bore yields 982 N push at 0.5 MPa; dropping to a 40mm bore gives 628 N, while a 63mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding. For this 150mm stroke, ensure guide alignment to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX150S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50BX150S FAQ
Yes, the SI50BX150S is discontinued. The direct replacement is the SAI50BX150S. It shares the same ISO 15552 mounting interface, 50mm bore, 150mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 air port. Force ratings are: push 982 N and pull 825 N at 0.5 MPa, push 1374 N at 0.7 MPa, push 1767 N at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX150S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX150S replacement — usually within 7-8 hours.