This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X250H, 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 SI63X250H
The AirTAC Airtac SI63 Standard Cylinder SI63X250H 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 SAI63X250H, 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 → SAI63X250H
- 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 SI63X250H
The AirTAC SI63X250H 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, this high-temp Viton H variant (-H) operates up to 150C. The direct replacement is the SAI63X250H, matching the exact interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Since this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor.
Airtac SI63 Standard Cylinder SI63X250H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X250H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X250H |
| 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 SAI63X250H 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 SAI63X250H 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 SI63X250H
| 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 SI63X250H Is Used
Hot Stamp Ejection
Viton H seals withstand 150C radiated heat near molding presses while pushing 1559N to eject formed parts.
High-Temp Diverting
Handles 250mm stroke diverting arms in dry heat ovens where standard NBR seals would prematurely fail.
Clamp Actuation
Provides robust 63mm bore clamping force on automotive fixtures, utilizing adjustable 30mm cushions to brake impact.
Replacing the Airtac SI63 Standard Cylinder SI63X250H with the SAI63X250H
To replace the SI63X250H, order the SAI63X250H. Verify the ISO 15552 mounting interface (LB, FA, TC, etc.), the 250mm stroke, M16x1.5 rod thread, and G3/8 port. Because this is a no-S model, magnetic sensing is impossible; order a -S variant if switches are needed. The 63mm bore yields 1559N push at 0.5MPa; step down to 50mm for 982N or up to 80mm for 2513N. For 250mm strokes, ensure guide rails carry side loads to prevent rod bending. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X250H
- ✓ 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 SI63X250H FAQ
Yes, the SI63X250H is discontinued. The direct replacement is the SAI63X250H. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 250mm stroke, G3/8 port, and mounting fixtures.
The 63mm bore uses a G3/8 port. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X250H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X250H replacement — usually within 7-8 hours.