This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X250N, 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 SI63X250N
The AirTAC Airtac SI63 Standard Cylinder SI63X250N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X250N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X250N
- 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 SI63X250N
The AirTAC SI63X250N is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 250 mm stroke. It delivers 1559 N push at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X250N, matching the bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S) so it cannot take a sensor, though legacy SI sensors were CS1-B/DS1-B. The NBR seal (-N) suits -20 to +70 C, while Viton H extends this.
Airtac SI63 Standard Cylinder SI63X250N Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X250N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X250N |
| Bore size | Ø63 mm |
| Stroke | 250 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 SAI63X250N 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 SAI63X250N 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 SI63X250N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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 SI63X250N Is Used
Clamp Actuation
Provides 1559 N of clamping force at 0.5 MPa for securing mid-weight workpieces during machining operations.
Package Diverting
Drives a 250 mm stroke diverter arm to route medium-sized cartons on a packaging line at up to 800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63X250N with the SAI63X250N
To replace the SI63X250N, order the SAI63X250N. Verify the ISO 15552 mounting interface, 250 mm stroke, G3/8 port (PT/G/NPT thread), and mounting accessory. This SKU has no magnet, so it cannot accept a sensor; if sensing is needed, order an SAI63X250NS. Sizing both ways: a 50 mm bore gives 982 N push @0.5 MPa, while an 80 mm bore gives 2513 N. For load holding, note a plain cylinder drifts on air loss as the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 250 mm stroke, check side-load and rod-bending limits using a guide.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X250N
- ✓ 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 SI63X250N FAQ
Yes, the SI63X250N is discontinued. The direct replacement is the SAI63X250N, which shares the same ISO 15552 mounting interface, 63 mm bore, 250 mm stroke, output force, and G3/8 port.
It features a G3/8 port and delivers 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X250N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X250N replacement — usually within 7-8 hours.