This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X875S, 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 SI50X875S
The AirTAC Airtac SI50 Standard Cylinder SI50X875S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 875mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X875S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke875 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X875S
- 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 SI50X875S
The AirTAC SI50X875S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore and 875mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X875S, matching the interface, bore, stroke, force and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X875S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X875S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X875S |
| Bore size | Ø50 mm |
| Stroke | 875 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 SAI50X875S 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 SAI50X875S 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 SI50X875S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×875 | 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 SI50X875S Is Used
Long-Stroke Diversion
Pushes packages across a 875mm conveyor belt span, utilizing the 982 N thrust at 0.5 MPa to overcome carton friction during lateral transfers.
Extended Reach Ejection
Ejects machined parts from a deep work cell over an 875mm extension, relying on external linear guides to prevent rod bending during the cycle.
Replacing the Airtac SI50 Standard Cylinder SI50X875S with the SAI50X875S
To replace the SI50X875S, order the SAI50X875S. Verify the ISO 15552 mounting interface, 50mm bore, 875mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors. Sizing options: step down to a 40mm bore (628 N [email protected]) or up to a 63mm bore (1559 N [email protected]). At 875mm, prevent rod bending by adding external guides to absorb side loads. For load holding on air loss, use an external rod lock or pilot check valve, as the cushion only decelerates.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X875S
- ✓ 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 SI50X875S FAQ
Yes, the SI50X875S is discontinued. The direct replacement is the SAI50X875S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 875mm stroke, G1/4 port, output force and mounting fixtures.
The G1/4 port feeds a 50mm bore yielding 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X875S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X875S replacement — usually within 7-8 hours.