This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X250CA, 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 SI63X250CA
The AirTAC Airtac SI63 Standard Cylinder SI63X250CA 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 SAI63X250CA, 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 → SAI63X250CA
- 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 SI63X250CA
The AirTAC SI63X250CA is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 250mm stroke. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63X250CA. This direct successor shares the exact CA clevis mounting, bore, and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. As this SKU lacks a magnet (-S), it cannot accept a CS1-B/DS1-B sensor.
The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Note that a standard cylinder drifts on air loss; the cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac SI63 Standard Cylinder SI63X250CA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X250CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X250CA |
| 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 SAI63X250CA 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 SAI63X250CA 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 SI63X250CA
| 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 SI63X250CA Is Used
Clamping Fixtures
Securing heavy machined parts during milling. The 1559N push force at 0.5MPa provides robust holding power for rigid workholding tasks.
Package Diverting
Actuating heavy-duty diverter arms on assembly lines. The 250mm stroke offers the reach needed to redirect large pallets effectively.
Material Lift Gates
Raising and lowering safety gates on loading docks.
Replacing the Airtac SI63 Standard Cylinder SI63X250CA with the SAI63X250CA
To replace the SI63X250CA, order the SAI63X250CA. Verify the ISO 15552 CA clevis interface, 63mm bore, 250mm stroke, G3/8 port, and M16x1.5 rod thread. Because this specific SKU has no magnet, it cannot support position sensing; order an SAI with the S suffix if switches are needed. At 0.5MPa the 63mm bore yields 1559N push and 1402N pull. If undersized, the 80mm bore provides 2513N push. For load holding on air loss, remember the cushion only decelerates and cannot brake a dropped load—select the SAIL or BSAI lock variant, or add a pilot check valve. At 250mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X250CA
- ✓ 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 SI63X250CA FAQ
Yes, the SI63X250CA is discontinued. The direct replacement is the SAI63X250CA. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 250mm stroke, CA clevis mount, G3/8 port, and output force, so it fits existing fixtures directly.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. It delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X250CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X250CA replacement — usually within 7-8 hours.