This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX240S, 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 SI50BX240S
The AirTAC SI50 Standard Cylinder SI50BX240S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 240mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX240S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX240S
- 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 SI50BX240S
The AirTAC SI50BX240S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, 240 mm stroke, and a SUS304 stainless piston rod. It delivers 982 N push force at 0.5 MPa and features a built-in magnet for CS1-B/DS1-B switches. The direct replacement is the SAI50BX240S, sharing the same G1/4 port, M16x1.5 thread, and 30 mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For high heat, Viton H seals raise the limit to 150 C.
Airtac SI50 Standard Cylinder SI50BX240S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX240S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX240S |
| Bore size | Ø50 mm |
| Stroke | 240 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 SAI50BX240S 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 SAI50BX240S 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 SI50BX240S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×240 | 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 SI50BX240S Is Used
Diverting Gate Actuation
Drives routing flaps on packaging lines, utilizing the 50 mm bore's 982 N thrust and 240 mm stroke to reposition heavy cardboard diverters reliably.
Vertical Pallet Stops
Functions as a pneumatic stop in low-flow accumulation zones, where the SUS304 rod resists humidity and the 240 mm extension clears pallet stringers.
Press Ejection Arms
Pushes stamped parts out of small presses, with the 30 mm adjustable air cushions absorbing kinetic energy at the stroke ends to prevent end-cap impact.
Replacing the Airtac SI50 Standard Cylinder SI50BX240S with the SAI50BX240S
To replace the SI50BX240S, order the SAI50BX240S. Confirm the ISO 15552 mounting interface, 50 mm bore, 240 mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet and -B SUS304 rod are retained. Sizing both ways: a neighbouring 40 mm bore yields 628 N push @0.5 MPa, while a 63 mm bore yields 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 240 mm stroke, ensure guide alignment to prevent rod bending side-loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX240S
- ✓ 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 SI50BX240S FAQ
Yes, the SI50BX240S is discontinued. The direct replacement is the SAI50BX240S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 240 mm stroke, 982 N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers a push force of 982 N and pull of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, and 1767 N at 0.9 MPa. The theoretical max force is 200 kgf at 1.0 MPa. Speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX240S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX240S replacement — usually within 7-8 hours.