This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX30S, 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 SI50BX30S
The AirTAC Airtac SI50 Standard Cylinder SI50BX30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX30S
- 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 SI50BX30S
The AirTAC SI50BX30S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 30mm stroke, and a SUS304 stainless steel rod. It delivers 982 N push force at 0.5 MPa. The direct replacement is the SAI50BX30S, which matches the original G1/4 port, M16x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The original -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. A Viton H seal option raises the temperature limit to 150 C.
Airtac SI50 Standard Cylinder SI50BX30S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX30S |
| Bore size | Ø50 mm |
| Stroke | 30 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 SAI50BX30S 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 SAI50BX30S 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 SI50BX30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SI50BX30S Is Used
Stainless Rod Diverter
Ideal for washdown diverting gates requiring the SUS304 rod for corrosion resistance, utilizing the short 30mm stroke to flip flow paths cleanly.
Compact Part Ejector
Delivers 982 N of push force at 0.5 MPa to eject small machined components from a fixture, fitting neatly into tight machinery envelopes.
Packaging Stopper Gate
Acts as a momentary stopper on a packaging conveyor, using the 50mm bore and 30mm stroke to halt boxes without occupying excessive space.
Replacing the Airtac SI50 Standard Cylinder SI50BX30S with the SAI50BX30S
To replace the SI50BX30S, order the SAI50BX30S to get the exact 50mm bore, 30mm stroke, G1/4 port, and ISO 15552 mounting dimensions for a direct fixture direct. Confirm you need the SUS304 stainless rod (-B) for corrosion resistance instead of the default carbon steel. The -S magnet allows position sensing. Sizing checks: if downsizing to a 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore offers 1559 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAIF variant integrates a 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX30S
- ✓ 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 SI50BX30S FAQ
Yes, the SI50BX30S is discontinued. The direct replacement is the SAI50BX30S. It shares the exact same ISO 15552 mounting interface, 50mm bore, 30mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
It features a G1/4 air port and M16x1.5 rod thread. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX30S replacement — usually within 7-8 hours.