This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX50S, 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 SI50BX50S
The AirTAC Airtac SI50 Standard Cylinder SI50BX50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX50S
- 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 SI50BX50S
The AirTAC SI50BX50S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod and a 50 mm stroke. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50BX50S. This direct upgrade keeps the exact G1/4 port, bore, and mounting interface, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The -S magnet works with legacy CS1-B/DS1-B sensors, while a plain cylinder drifts on air loss; for holding, use an external rod lock or SAIL lock variant.
Airtac SI50 Standard Cylinder SI50BX50S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX50S |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50BX50S 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 SAI50BX50S 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 SI50BX50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50BX50S Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS304 rod to clamp parts securely with 982 N of force.
Short-Stroke Diverting
The 50 mm stroke provides rapid actuation for diverting lightweight packages on material handling lines at speeds up to 800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50BX50S with the SAI50BX50S
To replace the SI50BX50S, order the SAI50BX50S. Verify the ISO 15552 mounting interface, 50 mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. The -B rod is SUS304 stainless, and the -S magnet supports CS1-B/DS1-B switches. If you need more force, the 63 mm bore yields 1559 N at 0.5 MPa; if less is needed, the 40 mm bore gives 628 N. Note that standard cylinders do not hold loads without live air—the cushion only decelerates—so add a pilot check valve or explore the SAIL/BSAI lock variants for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX50S
- ✓ 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 SI50BX50S FAQ
Yes, the SI50BX50S is discontinued. The direct replacement is the AirTAC SAI50BX50S. It is dimensionally interchangeable per ISO 15552, maintaining the same 50 mm bore, 50 mm stroke, G1/4 port, and mounting interface, but features an upgraded piston seal.
The bore is 50 mm with a G1/4 air port. The thrust 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. The rod is 20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX50S replacement — usually within 7-8 hours.