This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX10, 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 SI50BX10
The AirTAC Airtac SI50 Standard Cylinder SI50BX10 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 10mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX10, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke10 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX10
- 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 SI50BX10
The AirTAC SI50BX10 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 10mm stroke, delivering a push force of 982 N at 0.5 MPa. It is replaced by the SAI50BX10, a direct upgrade retaining the same G1/4 port, M16x1.5 rod thread, and ISO 15552 mounting interface. Because this SKU lacks a magnet, it cannot accept a position sensor.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also introduces lock and valve variants the SI lacked.
Airtac SI50 Standard Cylinder SI50BX10 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX10 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX10 |
| Bore size | Ø50 mm |
| Stroke | 10 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 SAI50BX10 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 SAI50BX10 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 SI50BX10
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×10 | 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 SI50BX10 Is Used
Short-Stroke Clamping
Ideal for holding parts in machining fixtures where a brief 10mm travel and 982 N force secure the workpiece.
Package Diversion
Provides rapid actuation for sorting arms on packaging lines, utilizing the 30-800 mm/s speed range.
Ejector Mechanism
Delivers quick, compact ejection of finished components from automated machinery under 50 kg load.
Replacing the Airtac SI50 Standard Cylinder SI50BX10 with the SAI50BX10
To replace the SI50BX10, order the SAI50BX10. Confirm the ISO 15552 mounting interface, the 50mm bore, the 10mm stroke, and the G1/4 port. This non-magnetic SKU cannot take a switch, so if sensing is needed you must order an SAI with the S magnet option for current AirTAC switches. For sizing down, a 40mm bore yields 628 N push at 0.5 MPa; sizing up to 63mm provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, consider the SAIL or BSAI lock variants, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX10
- ✓ 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 SI50BX10 FAQ
Yes, the SI50BX10 is discontinued. The direct replacement is the SAI50BX10, which shares the same ISO 15552 mounting interface, 50mm bore, 10mm stroke, force, and G1/4 port.
It features a G1/4 air port and M16x1.5 rod thread. Force output 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 max of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50BX10
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX10 replacement — usually within 7-8 hours.