This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X105STC, 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 SI50X105STC
The AirTAC Airtac SI50 Standard Cylinder SI50X105STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 105mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X105STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X105STC
- 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 SI50X105STC
The AirTAC SI50X105STC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 105 mm stroke, delivering 982 N push force at 0.5 MPa via a G1/4 port. It is replaced by the SAI50X105STC, a direct upgrade retaining the exact ISO 15552 mounting interface, TC trunnion mount, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while a plain cylinder drifts without air; use SAIL or BSAI lock variants for holding.
Airtac SI50 Standard Cylinder SI50X105STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X105STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X105STC |
| Bore size | Ø50 mm |
| Stroke | 105 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 SAI50X105STC 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 SAI50X105STC 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 SI50X105STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×105 | 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 SI50X105STC Is Used
Package Diversion
Pushes medium-weight cartons at 90 degrees on a sorting line using the 982 N push force at 0.5 MPa.
Clamp Actuation
Provides reliable clamping pressure for mid-sized aluminum fixtures during CNC machining operations.
Pallet Stopper
Acts as an end-of-line stop mechanism for loaded pallets, utilizing the 50 kg vertical lift margin.
Replacing the Airtac SI50 Standard Cylinder SI50X105STC with the SAI50X105STC
To replace the SI50X105STC, order the SAI50X105STC. Verify the ISO 15552 TC trunnion interface, 105 mm stroke, G1/4 port, and -S magnet for CS1-B/DS1-B switches. Sizing both ways: a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore yields 1559 N. If you need to hold a load during air loss, note that the air cushion only decelerates; add an external rod lock, pilot check valve, or use the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve for bores up to 100 mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X105STC
- ✓ 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 SI50X105STC FAQ
Yes, the SI50X105STC is discontinued. The direct replacement is the SAI50X105STC. It shares the identical ISO 15552 mounting interface, 50 mm bore, 105 mm stroke, output force, and G1/4 port, fitting directly into existing TC trunnion fixtures.
The G1/4 port feeds a 50 mm bore that generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X105STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X105STC replacement — usually within 7-8 hours.