This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX220, 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 SI50BX220
The AirTAC Airtac SI50 Standard Cylinder SI50BX220 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 220mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX220, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke220 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX220
- 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 SI50BX220
The AirTAC SI50BX220 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 220mm stroke. Delivering 982N push force at 0.5MPa, it features a G1/4 port and a SUS304 stainless piston rod. The direct replacement is the SAI50BX220, matching the bore, stroke, force, port and mounting fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor.
Airtac SI50 Standard Cylinder SI50BX220 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX220 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX220 |
| Bore size | Ø50 mm |
| Stroke | 220 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 SAI50BX220 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 SAI50BX220 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 SI50BX220
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×220 | 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 SI50BX220 Is Used
Diverting Gate Actuator
Provides the 982N push force at 0.5MPa needed to snap heavy conveyor sorting gates into position reliably across a 220mm travel.
Light Press Downstroke
Ideal for applying downward clamping pressure in small assembly presses, with the SUS304 rod offering corrosion resistance.
Pallet Stop Arm
Extends 220mm to halt pallets on a roller line, using adjustable 30mm air cushions to decelerate the stop smoothly at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50BX220 with the SAI50BX220
To replace the SI50BX220, order the SAI50BX220. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the exact 50mm bore, 220mm stroke, G1/4 port, M16x1.5 thread and 30mm cushions. This non-magnet SKU cannot accept a CS1-B/DS1-B switch; if sensing is needed, select an SAI model with the S suffix. For sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. At 220mm stroke, guide external rods to prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX220
- ✓ 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 SI50BX220 FAQ
Yes, the AirTAC SI50BX220 is discontinued. The direct replacement is the SAI50BX220. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 220mm stroke, 982N force, G1/4 port and mounting interface.
This double-acting cylinder has a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX220
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX220 replacement — usually within 7-8 hours.