This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X310S, 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 SI63X310S
The AirTAC Airtac SI63 Standard Cylinder SI63X310S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 310mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X310S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke310 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X310S
- 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 SI63X310S
The AirTAC SI63X310S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 310 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X310S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants (SAIL, SAIF, BSAI) absent in the original SI line. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X310S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X310S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X310S |
| Bore size | Ø63 mm |
| Stroke | 310 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 SAI63X310S 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 SAI63X310S 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 SI63X310S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×310 | 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 SI63X310S Is Used
Package Diverting
Actuates diverter arms on packaging lines, utilizing the 1559 N push force to redirect heavy cartons reliably at high cycling speeds.
Clamp Actuation
Drives vertical clamping fixtures in machining centers, where the 79 kg calculated vertical lift capacity securely holds workpieces.
Pallet Stopping
Controls heavy pallet stops on roller conveyors, using the 310 mm stroke to clear or block passing loads up to 800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63X310S with the SAI63X310S
To replace the SI63X310S, order the SAI63X310S. Confirm the ISO 15552 mounting interface, 63 mm bore, 310 mm stroke, G3/8 port (PT/G/NPT thread options), and your specific mounting accessory (LB, FA, TC, etc.). The -S suffix indicates a magnet for position sensing; use current AirTAC switches on the SAI replacement, or CS1-B/DS1-B on the legacy unit. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, consider the SAIL or BSAI lock variants, or an external pilot check valve. Because the 310 mm stroke is long, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X310S
- ✓ 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 SI63X310S FAQ
Yes, the SI63X310S is discontinued. The direct replacement is the AirTAC SAI63X310S. It shares the same ISO 15552 mounting interface, 63 mm bore, 310 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 63 mm bore features a G3/8 port and provides 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa it pushes 2182 N, and the theoretical maximum force is 318 kgf at 1.0 MPa. It uses a 20 mm rod with an M16x1.5 thread and 30 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X310S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X310S replacement — usually within 7-8 hours.