This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X85, 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 SI63 Standard Cylinder SI63X85
The AirTAC SI63 Standard Cylinder SI63X85 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 85mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X85, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X85
- 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 SI63 Standard Cylinder SI63X85
The AirTAC SI63X85 is a discontinued double-acting ISO 15552 profile cylinder with an 85 mm stroke and a 63 mm bore, delivering 1559 N push force at 0.5 MPa. AirTAC replaced it with the SAI63X85 direct upgrade. This current-production SAI model maintains the exact same ISO 15552 mounting interface, G3/8 port, and output force, dropping directly into existing fixtures.
The SAI upgrade features a redesigned piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates—so use the SAIL lock or BSAI clamp-lock variants if needed. This specific no-magnet SKU cannot accept a sensor.
Airtac SI63 Standard Cylinder SI63X85 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X85 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X85 |
| Bore size | Ø63 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X85 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X85 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X85
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | 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 SI63 Standard Cylinder SI63X85 Is Used
Clamp Actuation
Provides 1559 N of secure clamping force at 0.5 MPa for holding medium-weight machined parts during milling or drilling operations.
Package Diverting
Uses the 85 mm stroke to push moderate cartons off a main packaging line onto a secondary sorting lane with reliable speed.
Replacing the Airtac SI63 Standard Cylinder SI63X85 with the SAI63X85
To replace the discontinued SI63X85, order the SAI63X85 direct equivalent. Confirm the ISO 15552 mounting interface (LB foot, FA flange, TC trunnion, etc.), the 85 mm stroke, and the G3/8 port. Because this specific SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if position detection is required, select an SAI63X85S and current AirTAC switches. Sizing both ways: the 63 mm bore yields 1559 N push at 0.5 MPa, sitting between the 50 mm (982 N) and 80 mm (2513 N) options. A plain cylinder does not hold load without live air; for drop prevention, specify the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X85
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X85 FAQ
Yes, the SI63X85 is discontinued. The direct replacement is the AirTAC SAI63X85. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 85 mm stroke, G3/8 port, and mounting accessories.
The 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X85
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X85 replacement — usually within 7-8 hours.