This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X830STC, 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 SI50X830STC
The AirTAC SI50 Standard Cylinder SI50X830STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 830mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X830STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke830 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X830STC
- 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 SI50X830STC
The AirTAC SI50X830STC is a discontinued double-acting ISO 15552 profile cylinder with an 830 mm stroke, delivering 982 N of push force at 0.5 MPa. Because this legacy SI unit is end-of-life, AirTAC supplies the SAI50X830STC as the direct replacement. It preserves the exact bore, stroke, G1/4 port, TC trunnion mount, and ISO 15552 mounting interface for a seamless fixture retrofit.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X830STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X830STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X830STC |
| Bore size | Ø50 mm |
| Stroke | 830 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 SAI50X830STC 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 SAI50X830STC 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 SI50X830STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×830 | 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 SI50X830STC Is Used
Long-Stroke Material Transfer
Drives workpieces between processing stations on an 830 mm linear conveyor, utilizing the 982 N push force to overcome sliding friction reliably.
Pallet Push-Off Mechanism
Actuates a 50 kg load off an accumulation line using the TC trunnion mount to accommodate the pivoting arc of the long stroke.
Vertical Press Ejection
Pushes completed parts out of a fixture, relying on adjustable air cushions to decelerate the rod smoothly at the end of the 830 mm travel.
Replacing the Airtac SI50 Standard Cylinder SI50X830STC with the SAI50X830STC
To replace the SI50X830STC, order the SAI50X830STC and verify the ISO 15552 interface, 50 mm bore, 830 mm stroke, G1/4 port, and TC trunnion mounting. The -S magnet enables CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If sizing up or down, adjacent bores are 40 mm (628 N push @0.5 MPa) and 63 mm (1559 N push @0.5 MPa). Note that a plain cylinder drifts without live air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI variant. Because 830 mm exceeds 300 mm, use an external guide to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X830STC
- ✓ 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 SI50X830STC FAQ
Yes, the SI50X830STC is discontinued. The direct replacement is the SAI50X830STC. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 830 mm stroke, G1/4 port, TC mount, and output force to fit existing fixtures directly.
The bore has a G1/4 air port. At 0.5 MPa it provides 982 N push and 825 N pull force. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X830STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X830STC replacement — usually within 7-8 hours.