This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X250SH, 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 SI63X250SH
The AirTAC Airtac SI63 Standard Cylinder SI63X250SH 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 SAI63X250SH, 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 → SAI63X250SH
- 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 SI63X250SH
The AirTAC SI63X250SH is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 250mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X250SH, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI line lacked SAIL lock, SAIF valve, and BSAI clamp-lock variants now available. The -H suffix indicates a Viton seal for 0-150C, while the -S magnet works with CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X250SH Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X250SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X250SH |
| 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 SAI63X250SH 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 SAI63X250SH 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 SI63X250SH
| 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 SI63X250SH Is Used
Clamp Actuation
Secures heavy machining fixtures with 1559N push force at 0.5MPa, ensuring rigid part holding during milling operations.
Package Diversion
Drives 250mm stroke diverter arms to route mid-weight goods across packaging lines at speeds up to 800mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63X250SH with the SAI63X250SH
To replace the SI63X250SH, order the SAI63X250SH direct. Confirm the ISO 15552 mounting interface, 63mm bore, 250mm stroke, G3/8 port (PT/G/NPT thread), and mounting accessory. The -S magnet enables CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing, the 50mm bore yields 982N push at 0.5MPa, while the 80mm bore yields 2513N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 250mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X250SH
- ✓ 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 SI63X250SH FAQ
Yes, the SI63X250SH is discontinued. The direct replacement is the SAI63X250SH. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 250mm stroke, output force, G3/8 port, and mounting fixtures exactly.
The 63mm bore features a G3/8 port and provides 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa. It uses a 20mm rod with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X250SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X250SH replacement — usually within 7-8 hours.