This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X85TC, 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 SI50X85TC
The AirTAC Airtac SI50 Standard Cylinder SI50X85TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 85mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X85TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X85TC
- 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 SI50X85TC
The AirTAC SI50X85TC is a discontinued double-acting ISO 15552 profile cylinder with an 85 mm stroke and TC trunnion mount. Delivering 982 N push at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X85TC. This direct successor matches the bore, force, and ISO 15552 mounting interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. As this SKU lacks a magnet, it cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X85TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X85TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X85TC |
| Bore size | Ø50 mm |
| Stroke | 85 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 SAI50X85TC 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 SAI50X85TC 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 SI50X85TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×85 | 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 SI50X85TC Is Used
Mid-Force Assembly Press
Drives medium-duty press fits and component seating tasks requiring 982 N of push force at 0.5 MPa.
TC Trunnion Diverter
Actuates package routing gates using the ISO 15552 TC trunnion mount for pivoting motion over 85 mm.
Replacing the Airtac SI50 Standard Cylinder SI50X85TC with the SAI50X85TC
To replace the SI50X85TC, order the SAI50X85TC. Confirm the ISO 15552 TC trunnion interface, 50 mm bore, 85 mm stroke, and G1/4 port. Since this SKU lacks a magnet (-S), it cannot accept CS1-B/DS1-B sensors. If sizing up or down, note the 40 mm bore yields 628 N push while the 63 mm bore yields 1559 N at 0.5 MPa. For load holding on air loss, the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X85TC
- ✓ 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 SI50X85TC FAQ
Yes, the SI50X85TC is discontinued. The direct replacement is the SAI50X85TC. It features the same ISO 15552 TC mounting interface, 50 mm bore, 85 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port feeds a 20 mm rod. Forces are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a 200 kgf max at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X85TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X85TC replacement — usually within 7-8 hours.