This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X510S, 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 SI50X510S
The AirTAC Airtac SI50 Standard Cylinder SI50X510S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 510mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X510S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke510 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X510S
- 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 SI50X510S
The AirTAC SI50X510S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 510 mm stroke. Delivering 982 N push force at 0.5 MPa through a G1/4 port, it is replaced by the SAI50X510S. This direct successor matches the exact bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. It also expands options with SAIL, SAIF, and BSAI variants absent from the SI line. The original SI-S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X510S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X510S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X510S |
| Bore size | Ø50 mm |
| Stroke | 510 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 SAI50X510S 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 SAI50X510S 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 SI50X510S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×510 | 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 SI50X510S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 510 mm travel, relying on the 982 N thrust at 0.5 MPa to overcome carton friction.
Vertical Material Lift
Elevates tote bins up to the 50 kg vertical limit, requiring external guides to stabilize the extended 20 mm rod during transit.
Pneumatic Stopper Gate
Acts as a raised stop barrier on accumulating conveyors, dropping down to hold pallets until the downstream process clears.
Replacing the Airtac SI50 Standard Cylinder SI50X510S with the SAI50X510S
To replace the SI50X510S, order the SAI50X510S, confirming the ISO 15552 mounting interface, 50 mm bore, 510 mm stroke, G1/4 port, and M16x1.5 rod thread. Retain your original mounting accessory and verify the -S magnet requirement for current AirTAC switch compatibility. Sizing both ways: a neighbouring 63 mm bore yields 1559 N push at 0.5 MPa, whereas dropping to a 40 mm bore provides 628 N. Note that a plain cylinder drifts without live air, as the cushion only decelerates; for load holding, specify an external pilot check valve or the SAIL lock variant. Because 510 mm exceeds 300 mm, add external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X510S
- ✓ 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 SI50X510S FAQ
Yes, the SI50X510S is discontinued. The direct replacement is the AirTAC SAI50X510S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 510 mm stroke, output force, G1/4 port, and mounting interface.
The 50 mm bore features a G1/4 air port and provides 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X510S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X510S replacement — usually within 7-8 hours.