This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X240, 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 SI50X240
The AirTAC Airtac SI50 Standard Cylinder SI50X240 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 SAI50X240, 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 → SAI50X240
- 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 SI50X240
The AirTAC SI50X240 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 240 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X240, matching the interface, bore, stroke, force, port and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot take a sensor; legacy -S types used CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X240 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X240 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X240 |
| 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 SAI50X240 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 SAI50X240 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 SI50X240
| 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 SI50X240 Is Used
Package Diverting
Actuates diverter arms on packaging lines, using the 240 mm stroke to push cartons cleanly between parallel conveyor belts.
Pallet Stops
Raises and lowers pneumatic stop gates at palletizing stations, holding loads up to 50 kg safely during transit gaps.
Clamp Actuation
Drives mid-force clamping mechanisms in CNC machining fixtures, providing reliable 982 N hold pressure at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50X240 with the SAI50X240
To replace the SI50X240, order the SAI50X240. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor; order the SAI50X240S if position sensing is required. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; step down to a 40 mm bore (628 N) for lighter loads or up to a 63 mm bore (1559 N) for heavier tasks. At 240 mm stroke, watch for side-load and rod-bending—use a guide to prevent jamming. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X240
- ✓ 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 SI50X240 FAQ
Yes, the AirTAC SI50X240 is discontinued and end-of-life. The direct replacement is the SAI50X240. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 240 mm stroke, output force, G1/4 port, and mounting interface, so it fits existing fixtures perfectly.
The 50 mm bore features a G1/4 air port and an M16x1.5 rod thread. At 0.5 MPa it provides 982 N push and 825 N pull force. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X240
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X240 replacement — usually within 7-8 hours.