This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X35SCA, 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 SI50X35SCA
The AirTAC SI50 Standard Cylinder SI50X35SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 35mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X35SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke35 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X35SCA
- 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 SI50X35SCA
The AirTAC SI50X35SCA is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 35mm stroke, and CA clevis mounting. Delivering 982N push force at 0.5MPa through a G1/4 port, it is replaced by the SAI50X35SCA. This direct successor matches the exact interface, bore, and force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. The -S magnet supports CS1-B/DS1-B sensors, while Viton H seals raise heat to 150C.
Airtac SI50 Standard Cylinder SI50X35SCA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X35SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X35SCA |
| Bore size | Ø50 mm |
| Stroke | 35 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 SAI50X35SCA 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 SAI50X35SCA 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 SI50X35SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×35 | 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 SI50X35SCA Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, using the 982N push force and 35mm stroke to secure workpieces firmly.
Package Diverting
Provides rapid actuation for sorting or diverting light packages on a line, operating efficiently at 30-800 mm/s.
Ejector Mechanisms
Suitable for pushing finished parts out of a fixture, leveraging the compact 35mm stroke and CA clevis for pivot mounting.
Replacing the Airtac SI50 Standard Cylinder SI50X35SCA with the SAI50X35SCA
To replace the SI50X35SCA, order the SAI50X35SCA and confirm the ISO 15552 interface, 50mm bore, 35mm stroke, G1/4 port, and CA clevis mount. The -S magnet means it accepts CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Sizing both ways: a 40mm bore yields 628N [email protected], while a 63mm bore yields 1559N. This plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X35SCA
- ✓ 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 SI50X35SCA FAQ
Yes, the AirTAC SI50X35SCA is discontinued. The direct replacement is the SAI50X35SCA, which shares the same ISO 15552 mounting interface, 50mm bore, 35mm stroke, output force, and G1/4 port.
The 50mm bore features a G1/4 port, M16x1.5 rod thread, and 30mm cushions. It delivers 982N push / 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X35SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X35SCA replacement — usually within 7-8 hours.