This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX110S, 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 SI50BX110S
The AirTAC Airtac SI50 Standard Cylinder SI50BX110S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX110S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX110S
- 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 SI50BX110S
The AirTAC SI50BX110S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 110mm stroke, and a SUS304 stainless piston rod. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50BX110S, a direct sharing the exact ISO 15552 mounting interface, stroke, force, and accessories.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The built-in magnet supports legacy CS1-B/DS1-B sensors, while a Viton H seal option raises operating temperatures to 150 C.
Airtac SI50 Standard Cylinder SI50BX110S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX110S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX110S |
| Bore size | Ø50 mm |
| Stroke | 110 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 SAI50BX110S 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 SAI50BX110S 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 SI50BX110S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×110 | 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 SI50BX110S Is Used
Stainless Rod Diverting
Ideal for diverting packages on a conveyor line where the SUS304 rod resists moisture and the 982 N force easily pushes standard totes.
Vertical Lift Gates
Provides a safe 589 N working load for lowering lightweight access gates, ensuring smooth deceleration via its 30mm adjustable air cushions.
Pneumatic Stopper Arms
Acts as a reliable stopping arm in material handling zones, using the 110mm stroke to block pallets moving at moderate speeds.
Replacing the Airtac SI50 Standard Cylinder SI50BX110S with the SAI50BX110S
To replace the SI50BX110S, order the SAI50BX110S and verify the ISO 15552 mounting interface, 110mm stroke, G1/4 port, and M16x1.5 rod thread. The -B rod (SUS304) and -S magnet are retained. For lighter loads, a 40mm bore yields 628 N push at 0.5 MPa; for heavier tasks, a 63mm bore provides 1559 N. Remember, a standard cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX110S
- ✓ 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 SI50BX110S FAQ
Yes, the SI50BX110S is discontinued. The direct replacement is the SAI50BX110S. It shares the identical ISO 15552 mounting interface, 50mm bore, 110mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. The operating speed ranges from 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX110S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX110S replacement — usually within 7-8 hours.