This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X730STC, 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 SI50X730STC
The AirTAC Airtac SI50 Standard Cylinder SI50X730STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 730mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X730STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke730 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X730STC
- 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 SI50X730STC
The AirTAC SI50X730STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 730mm stroke, G1/4 port and TC trunnion mount. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50X730STC direct. The SAI retains the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures directly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. The -S magnet works with CS1-B/DS1-B sensors, and Viton H seals raise heat to 150C.
Airtac SI50 Standard Cylinder SI50X730STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X730STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X730STC |
| Bore size | Ø50 mm |
| Stroke | 730 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 SAI50X730STC 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 SAI50X730STC 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 SI50X730STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×730 | 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 SI50X730STC Is Used
Long-Stroke Diverting
Drives a 730mm lane diverter on a packaging line, using the TC trunnion to pivot smoothly while moving light pallets.
Material Transfer
Shifts workpieces between machine stations over a 730mm gap, relying on external guides to prevent rod side-load bending.
Replacing the Airtac SI50 Standard Cylinder SI50X730STC with the SAI50X730STC
To replace the SI50X730STC, order the SAI50X730STC. Confirm the ISO 15552 TC trunnion mount, 50mm bore, 730mm stroke, G1/4 port (PT/G/NPT) and -S magnet for CS1-B/DS1-B switches. For sizing, the 50mm bore yields 982N push at 0.5MPa; neighbouring bores are 40mm (628N) or 63mm (1559N). A plain cylinder drifts on air loss as cushions only decelerate; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 730mm, prevent rod bending by guiding the load externally.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X730STC
- ✓ 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 SI50X730STC FAQ
Yes, the AirTAC SI50X730STC is discontinued. The direct replacement is the SAI50X730STC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 730mm stroke, G1/4 port, TC mount and output force for a seamless fixture swap.
This double-acting cylinder has a G1/4 port. Force ratings are: push 982N and pull 825N at 0.5MPa, push 1374N at 0.7MPa, push 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X730STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X730STC replacement — usually within 7-8 hours.