This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X410S, 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 SI50X410S
The AirTAC SI50 Standard Cylinder SI50X410S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 410mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X410S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke410 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X410S
- 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 SI50X410S
The AirTAC SI50X410S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 410 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X410S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors, and Viton H seal options extend operating temperature to 150 C.
Airtac SI50 Standard Cylinder SI50X410S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X410S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X410S |
| Bore size | Ø50 mm |
| Stroke | 410 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 SAI50X410S 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 SAI50X410S 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 SI50X410S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×410 | 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 SI50X410S Is Used
Long-Stroke Diverting
Pushes packages across transfer lines with a 410 mm reach, utilizing the 982 N push force at 0.5 MPa to overcome side friction.
Pallet Handling
Extends 410 mm to position pallets at machining centers, benefiting from the adjustable 30 mm air cushions at stroke ends.
Replacing the Airtac SI50 Standard Cylinder SI50X410S with the SAI50X410S
To replace the SI50X410S, order the SAI50X410S and confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread, and magnet option. If you need more force, the 63 mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40 mm bore provides 628 N. Because this is a 410 mm stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder does not hold load without live air; the cushions only decelerate. For load holding on air loss, use an external pilot check valve or explore the SAIL lock and BSAI clamp-lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X410S
- ✓ 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 SI50X410S FAQ
Yes, the SI50X410S is discontinued. The direct replacement is the SAI50X410S. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 410 mm stroke, 982 N force, G1/4 port, and mounting accessories.
The 50 mm bore uses a G1/4 port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa. Speed ranges from 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X410S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X410S replacement — usually within 7-8 hours.