This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X775, 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 SI50X775
The AirTAC Airtac SI50 Standard Cylinder SI50X775 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 775mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X775, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke775 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X775
- 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 SI50X775
The AirTAC SI50X775 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 775 mm stroke. Delivering 982 N push at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI50X775. This direct successor matches the exact bore, stroke, force, and mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; legacy CS1-B/DS1-B switches require an -S variant. Viton H seals raise heat to 150 C.
Airtac SI50 Standard Cylinder SI50X775 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X775 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X775 |
| Bore size | Ø50 mm |
| Stroke | 775 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 SAI50X775 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 SAI50X775 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 SI50X775
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×775 | 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 SI50X775 Is Used
Long-Stroke Diversion
Drives a 775 mm routing gate on a packaging line, using the 982 N thrust to push cartons cleanly between parallel conveyor belts.
Pneumatic Press Downstroke
Applies up to 1767 N of clamping force at 0.9 MPa for seating lightweight components, relying on adjustable cushions to stop smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50X775 with the SAI50X775
To replace the SI50X775, order the SAI50X775. Verify your ISO 15552 mounting (LB, FA, TC, etc.), the G1/4 port, and M16x1.5 rod thread. This non-magnet version cannot accept a sensor; if position detection is needed, select an SAI50X775S and use current AirTAC switches. At 775 mm, the stroke demands external guides to prevent rod bending and side-load wear. Sizing down, a 40 mm bore yields 628 N; sizing up, a 63 mm bore yields 1559 N at 0.5 MPa. The cushion only decelerates; it does not hold load. For drop prevention, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X775
- ✓ 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 SI50X775 FAQ
Yes, the SI50X775 is discontinued. The direct replacement is the AirTAC SAI50X775. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 50 mm bore, 775 mm stroke, output force, G1/4 port, and mounting accessories.
The 50 mm bore uses a G1/4 air port. Force output is 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 maximum of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI50X775
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X775 replacement — usually within 7-8 hours.