This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X312SN, 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 SI63X312SN
The AirTAC Airtac SI63 Standard Cylinder SI63X312SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 312mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X312SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke312 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X312SN
- 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 SI63X312SN
The AirTAC SI63X312SN is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 312mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X312SN, matching the exact interface, stroke and force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The NBR seal handles -20 to +70C, while Viton H extends to 150C. This -S model supports CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X312SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X312SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X312SN |
| Bore size | Ø63 mm |
| Stroke | 312 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 SAI63X312SN 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 SAI63X312SN 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 SI63X312SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×312 | 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 SI63X312SN Is Used
Package Diversion
Pushes heavy cartons on packaging lines using its 1559N push force at 0.5MPa, with the 312mm stroke clearing wide conveyor belts.
Pallet Handling
Actuates stops and gates in pallet flow systems, where the NBR seals and 63mm bore offer reliable mid-weight force.
Replacing the Airtac SI63 Standard Cylinder SI63X312SN with the SAI63X312SN
To replace the SI63X312SN, order the SAI63X312SN. Confirm the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, NBR seal, and the -S magnet for CS1-B/DS1-B switches. The 312mm stroke is nonstandard (max standard is 1500mm), but SAI accommodates it; however, at 312mm you must use external guides to prevent rod bending and side loads. For sizing, the 63mm bore yields 1559N push at 0.5MPa; dropping to a 50mm bore gives 982N, while an 80mm bore gives 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X312SN
- ✓ 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 SI63X312SN FAQ
Yes, the SI63X312SN is discontinued. The direct replacement is the SAI63X312SN. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 312mm stroke, G3/8 port, and mounting fixtures.
The 63mm bore uses a G3/8 port. It delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a max theoretical force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X312SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X312SN replacement — usually within 7-8 hours.