This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX260S, 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 SI50BX260S
The AirTAC SI50 Standard Cylinder SI50BX260S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 260mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX260S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke260 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX260S
- 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 SI50BX260S
The AirTAC SI50BX260S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 260mm stroke, and a SUS304 stainless rod. Delivering 982 N push at 0.5 MPa via a G1/4 port, it is replaced by the direct replacement SAI50BX260S. This upgrade retains identical mounting and force but uses two Y-shaped piston seals for low start-up pressure.
The SAI family introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. This -S model supports legacy CS1-B/DS1-B sensors, while the SAI uses current switches. Note that air cushions only decelerate; use a pilot check valve to hold loads.
Airtac SI50 Standard Cylinder SI50BX260S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX260S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX260S |
| Bore size | Ø50 mm |
| Stroke | 260 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 SAI50BX260S 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 SAI50BX260S 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 SI50BX260S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×260 | 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 SI50BX260S Is Used
Diverting Gates
Actuates routing flaps on packaging lines, utilizing the 982 N push force and 260mm travel to redirect cartons smoothly.
Vertical Pressing
Provides a 50 kg safe vertical pressing load, using the adjustable 30mm end cushions to decelerate the mass before impact.
Pallet Stops
Deploys a 260mm stroke stop pin for pallet handling, with the SUS304 rod offering corrosion resistance in humid settings.
Replacing the Airtac SI50 Standard Cylinder SI50BX260S with the SAI50BX260S
To replace the SI50BX260S, order the SAI50BX260S to keep the ISO 15552 interface, 50mm bore, 260mm stroke, G1/4 port, and SUS304 rod. Retain your -S magnet and CS1-B/DS1-B switches. Sizing both ways: a 40mm bore yields 628 N push, while a 63mm bore yields 1559 N at 0.5 MPa. For this 260mm stroke, ensure guide alignment to prevent rod bending. The cushion only decelerates; for load holding, specify an external pilot check valve or the SAIL lock variant. Viton H seals raise heat to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX260S
- ✓ 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 SI50BX260S FAQ
Yes, the SI50BX260S is discontinued. The direct replacement is the SAI50BX260S, which matches the ISO 15552 mounting interface, 50mm bore, 260mm stroke, and G1/4 port.
At 0.5 MPa it pushes 982 N and pulls 825 N. At 0.7 MPa it pushes 1374 N, and the theoretical max is 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX260S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX260S replacement — usually within 7-8 hours.