This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X750STC, 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 SI50X750STC
The AirTAC SI50 Standard Cylinder SI50X750STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X750STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X750STC
- 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 SI50X750STC
The AirTAC SI50X750STC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 750 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this unit with the SAI50X750STC, a direct sharing the exact TC trunnion mount, M16x1.5 rod, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The SAI family adds SAIL, SAIF, and BSAI variants lacking in the SI line. Your -S magnet works with CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X750STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X750STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X750STC |
| Bore size | Ø50 mm |
| Stroke | 750 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 SAI50X750STC 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 SAI50X750STC 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 SI50X750STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×750 | 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 SI50X750STC Is Used
Long-Stroke Diversion
Ideal for pushing heavy cartons across transfer lines with its 750 mm reach and 982 N push force at 0.5 MPa.
TC-Mount Pivoting Press
The TC trunnion mounting allows angular self-alignment in assembly stations, absorbing minor misalignments during actuation.
Replacing the Airtac SI50 Standard Cylinder SI50X750STC with the SAI50X750STC
To replace the SI50X750STC, order the SAI50X750STC. It drops into existing fixtures per the ISO 15552 mounting interface, matching the 50 mm bore, 750 mm stroke, G1/4 port, and TC trunnion mount. If you need more force, the neighboring 63 mm bore yields 1559 N at 0.5 MPa; if less is required, the 40 mm bore gives 628 N. For this 750 mm stroke, use an external guide to prevent rod bending and side loads. The TC mount allows pivoting. A plain cylinder drifts without air; for load holding, use the SAIL lock variant or a pilot check valve. The -S magnet accepts CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X750STC
- ✓ 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 SI50X750STC FAQ
Yes, the SI50X750STC is discontinued. The direct replacement is the SAI50X750STC. It shares the exact ISO 15552 mounting interface, 50 mm bore, 750 mm stroke, G1/4 port, and TC trunnion mount, fitting existing fixtures perfectly.
The bore is 50 mm with a G1/4 air port. The thrust is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X750STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X750STC replacement — usually within 7-8 hours.