This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X311, 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 SI63X311
The AirTAC Airtac SI63 Standard Cylinder SI63X311 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 311mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X311, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke311 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X311
- 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 SI63X311
The AirTAC SI63X311 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 311 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. Because this legacy unit is end-of-life, you should order the SAI63X311 direct replacement, which matches the exact mounting interface, bore, stroke, output force and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For sensing, note this specific SI SKU lacks the -S magnet and cannot accept a CS1-B/DS1-B switch. The SAI family also adds SAIL, SAIF and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X311 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X311 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X311 |
| Bore size | Ø63 mm |
| Stroke | 311 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 SAI63X311 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 SAI63X311 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 SI63X311
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×311 | 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 SI63X311 Is Used
Automated Clamping
Supplies 1559 N at 0.5 MPa to secure heavy workpieces during machining operations.
Package Diversion
Extends 311 mm to push heavy cartons across transfer lines without external air locks.
Pallet Handling
Drives lifting gates or stops in material handling setups using standard ISO 15552 fixtures.
Replacing the Airtac SI63 Standard Cylinder SI63X311 with the SAI63X311
To replace the SI63X311, specify the SAI63X311 and verify your ISO 15552 mounting accessory (LB, FA, CA, TC), G3/8 port thread and M16x1.5 rod end. This 311 mm stroke is nonstandard and exceeds typical increments; for strokes over 300 mm, use external guides to prevent rod bending and side-load wear. Sizing options: drop to a 50 mm bore for 982 N push at 0.5 MPa, or step up to an 80 mm bore for 2513 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use the SAIL lock or a pilot check valve to hold loads. This no-magnet SKU cannot take a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X311
- ✓ 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 SI63X311 FAQ
Yes, the AirTAC SI63X311 is discontinued. The direct replacement is the SAI63X311. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 311 mm stroke, G3/8 port and output force, so it fits existing fixtures perfectly.
This double-acting cylinder uses a G3/8 port. It generates 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. Speed range is 30-800 mm/s.
Request a Quote for the SAI63X311
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X311 replacement — usually within 7-8 hours.