This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X155SN, 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 SI63X155SN
The AirTAC Airtac SI63 Standard Cylinder SI63X155SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 155mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X155SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke155 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X155SN
- 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 SI63X155SN
The AirTAC SI63X155SN is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 155mm stroke. Delivering 1559N push force at 0.5MPa via its G3/8 port, it is replaced by the SAI63X155SN. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, force and accessories, fitting existing fixtures perfectly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SI's NBR seals suit -20 to +70C, while Viton H extends this to 150C. Rod options include carbon steel, SUS420J2 or SUS304. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X155SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X155SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X155SN |
| Bore size | Ø63 mm |
| Stroke | 155 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 SAI63X155SN 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 SAI63X155SN 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 SI63X155SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×155 | 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 SI63X155SN Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in CNC machining fixtures, utilizing the 1559N push force at 0.5MPa for rigid, zero-shift holding.
Pallet Diversion
Actuates routing gates and stops on assembly lines, where the 1402N pull force easily redirects loaded pallets.
Vertical Lift Gates
Raises and lowers material handling barriers.
Replacing the Airtac SI63 Standard Cylinder SI63X155SN with the SAI63X155SN
To replace the SI63X155SN, order the SAI63X155SN. Verify the ISO 15552 interface, 63mm bore, 155mm stroke, G3/8 port (PT/G/NPT thread), M16x1.5 rod thread and mounting accessory (LB, FA, CA, TC). The -S magnet enables current AirTAC switches. Sizing both ways: a 50mm bore yields 982N [email protected], while an 80mm bore yields 2513N. For load holding, note a plain cylinder drifts on air loss; the 30mm cushions only decelerate. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. If stroke exceeds 300mm, add a guide to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X155SN
- ✓ 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 SI63X155SN FAQ
Yes, the SI63X155SN is discontinued. The direct replacement is the SAI63X155SN. It shares the same ISO 15552 mounting interface, 63mm bore, 155mm stroke, output force, G3/8 port and mounting accessories, fitting existing fixtures perfectly.
The G3/8 port delivers a push force of 1559N and pull of 1402N at 0.5MPa. At 0.7MPa push is 2182N, and 2805N at 0.9MPa. The theoretical max force is 318kgf at 1.0MPa. Speed is 30-800mm/s with 30mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X155SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X155SN replacement — usually within 7-8 hours.