This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X250FTC, 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 SI63X250FTC
The AirTAC Airtac SI63 Standard Cylinder SI63X250FTC 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 SAI63X250FTC, 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 → SAI63X250FTC
- 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 SI63X250FTC
The AirTAC SI63X250FTC 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. Because this legacy unit is end-of-life, you should order the direct replacement: SAI63X250FTC. It matches the ISO 15552 mounting interface, bore, stroke, force, port and FTC trunnion hardware exactly, dropping straight into existing fixtures.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63X250FTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X250FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X250FTC |
| 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 SAI63X250FTC 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 SAI63X250FTC 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 SI63X250FTC
| 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 SI63X250FTC Is Used
Clamp Actuation
Provides 1559N of clamping force at 0.5MPa for securing mid-weight workpieces during machining operations.
Package Diversion
Drives 250mm stroke diverter arms to route goods on processing lines at speeds up to 800mm/s.
Pallet Lift Gates
Operates safety gates or light pallet stops using the FTC trunnion mount to handle pivot dynamics.
Replacing the Airtac SI63 Standard Cylinder SI63X250FTC with the SAI63X250FTC
To replace the SI63X250FTC, order the SAI63X250FTC. Verify the ISO 15552 FTC trunnion mount, 63mm bore, 250mm stroke, G3/8 port and thread type (PT/G/NPT). Because this SKU lacks the -S magnet, it cannot support position sensing; if switches are needed, specify an SAI63X250FTCS. Sizing both ways: the 63mm bore yields 1559N push at 0.5MPa, while the neighbouring 80mm bore offers 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant. At 250mm stroke, guide external rods to prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X250FTC
- ✓ 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 SI63X250FTC FAQ
Yes, the SI63X250FTC is discontinued. The direct replacement is the SAI63X250FTC. It shares the identical ISO 15552 mounting interface, 63mm bore, 250mm stroke, force output, G3/8 port and FTC trunnion mount, fitting seamlessly into existing fixtures.
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 of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X250FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X250FTC replacement — usually within 7-8 hours.