This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX80, 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 SI50BX80
The AirTAC Airtac SI50 Standard Cylinder SI50BX80 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX80, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX80
- 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 SI50BX80
The AirTAC SI50BX80 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and 50 mm bore. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct successor is the SAI50BX80, which retains the identical interface, M16x1.5 rod thread, and 30 mm cushions.
This SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent from the SI line. Note this specific SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors.
Airtac SI50 Standard Cylinder SI50BX80 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX80 |
| Bore size | Ø50 mm |
| Stroke | 80 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 SAI50BX80 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 SAI50BX80 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 SI50BX80
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SI50BX80 Is Used
Package Diverting
Ideal for pushing 50 kg cartons at 90 degrees on a sorting line, utilizing the 982 N push force at 0.5 MPa for reliable lateral transfers.
Clamping Fixtures
Holds workpieces securely during machining operations, where the 825 N pull force at 0.5 MPa provides stable resistance against cutting vibration.
Pallet Stops
Acts as a pneumatic stop mechanism for inbound pallets, decelerating loads smoothly via the 30 mm adjustable air cushions at both ends.
Replacing the Airtac SI50 Standard Cylinder SI50BX80 with the SAI50BX80
To replace the discontinued SI50BX80, order the SAI50BX80. It is dimensionally interchangeable per ISO 15552 mounting-interface dimensions, maintaining the same 50 mm bore, 80 mm stroke, G1/4 port, and 200 kgf max force. Because this SKU has no -S magnet, it cannot support position sensing; if detection is needed, select an SAI50X80S and use current AirTAC switches. For higher force, the neighbouring 63 mm bore yields 1559 N at 0.5 MPa; for lower loads, the 40 mm bore provides 628 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve. The -B rod option provides a SUS304 stainless piston rod for corrosive environments, and a Viton H seal raises the temperature limit to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX80
- ✓ 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 SI50BX80 FAQ
Yes, the SI50BX80 is discontinued. The direct replacement is the AirTAC SAI50BX80. It features the same ISO 15552 mounting interface, 50 mm bore, 80 mm stroke, output force, G1/4 port, and accessories, fitting directly into existing fixtures.
The cylinder features a G1/4 air port. It delivers a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa the push force is 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Request a Quote for the SAI50BX80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX80 replacement — usually within 7-8 hours.