This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X530STC, 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 SI50X530STC
The AirTAC SI50 Standard Cylinder SI50X530STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 530mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X530STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke530 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X530STC
- 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 SI50X530STC
The AirTAC SI50X530STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 530mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X530STC, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and TC trunnion mount.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The built-in magnet supports CS1-B/DS1-B sensors, and rod materials include SUS420J2 or SUS304.
Airtac SI50 Standard Cylinder SI50X530STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X530STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X530STC |
| Bore size | Ø50 mm |
| Stroke | 530 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 SAI50X530STC 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 SAI50X530STC 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 SI50X530STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×530 | 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 SI50X530STC Is Used
Long-Stroke Diversion
Drives a 530mm routing arm on a packaging conveyor, utilizing the TC trunnion mount to accommodate pivot arc during material transfer.
Component Ejection
Pushes machined parts out of a CNC enclosure, where the adjustable 30mm air cushions decelerate the rod at stroke end to prevent impact damage.
Replacing the Airtac SI50 Standard Cylinder SI50X530STC with the SAI50X530STC
To replace the SI50X530STC, order the SAI50X530STC. Confirm the ISO 15552 TC trunnion interface, 50mm bore, 530mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B switches. For sizing, neighboring bores are 40mm (628N push @0.5MPa) and 63mm (1559N push @0.5MPa). Because this is a 530mm stroke, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts without live air; for load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Viton H seals raise operating temperature to 150C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X530STC
- ✓ 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 SI50X530STC FAQ
Yes, the AirTAC SI50X530STC is discontinued. The direct replacement is the SAI50X530STC. It shares the same ISO 15552 interface, 50mm bore, 530mm stroke, force, G1/4 port, and TC mounting, fitting existing fixtures perfectly.
The G1/4 port bore delivers a push force of 982N and pull of 825N at 0.5MPa. At 0.7MPa push is 1374N, and 1767N at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X530STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X530STC replacement — usually within 7-8 hours.