This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX210, 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 SI50BX210
The AirTAC Airtac SI50 Standard Cylinder SI50BX210 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX210, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX210
- 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 SI50BX210
The AirTAC SI50BX210 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, 210 mm stroke, Ø20 mm rod and G1/4 port. It delivers 982 N push and 825 N pull at 0.5 MPa. The direct replacement is the SAI50BX210, which shares the exact ISO 15552 mounting interface, output force and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU has a SUS304 stainless rod (-B) for corrosion resistance but lacks a magnet (-S), so it cannot take CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50BX210 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX210 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX210 |
| Bore size | Ø50 mm |
| Stroke | 210 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 SAI50BX210 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 SAI50BX210 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 SI50BX210
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×210 | 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 SI50BX210 Is Used
Diverting Gate Actuator
Drives a routing flap on a packaging line, using the 982 N push force to deflect cartons into secondary lanes without stalling.
Light Press Tool
Applies steady downward clamping pressure for assembling small housings, benefiting from the 825 N pull force during retraction.
Stainless Rod Washdown
Operates a washdown reject arm where the SUS304 (-B) piston rod resists moisture and corrosion better than standard carbon steel.
Replacing the Airtac SI50 Standard Cylinder SI50BX210 with the SAI50BX210
To replace this discontinued SI50BX210, order the SAI50BX210. Verify the ISO 15552 mounting interface, 50 mm bore, 210 mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. Because this SKU has no magnet (-S), it cannot accept position sensors; add the -S suffix if you need CS1-B/DS1-B switches. Sizing both ways: a 40 mm bore yields 628 N push, while a 63 mm bore yields 1559 N at 0.5 MPa. For 210 mm strokes, guide rods prevent side-load rod bending. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX210
- ✓ 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 SI50BX210 FAQ
Yes, the SI50BX210 is discontinued. The direct replacement is the AirTAC SAI50BX210. It features the same ISO 15552 mounting interface, 50 mm bore, 210 mm stroke, G1/4 port and output force, fitting existing fixtures perfectly.
This double-acting cylinder has a 50 mm bore, Ø20 mm rod, M16x1.5 thread, 30 mm cushion and G1/4 port. Force ratings are 982 N push / 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX210
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX210 replacement — usually within 7-8 hours.