This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX25, 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 SI63BX25
The AirTAC SI63 Standard Cylinder SI63BX25 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX25, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX25
- 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 SI63BX25
The AirTAC SI63BX25 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 25 mm stroke. It delivers 1559 N push force at 0.5 MPa. This version features a SUS304 stainless piston rod (-B) for corrosion resistance. As an end-of-life product, it drops into the SAI63BX25 replacement.
The SAI63BX25 is a direct upgrade sharing the exact ISO 15552 mounting interface, 1559 N output, G3/8 port, and M16x1.5 rod thread. The SAI adds an upgraded piston seal (two Y-shaped elements for low start-up pressure) and introduces lock variants (SAIL, BSAI) absent in the SI line. Note: lacking the -S magnet, this SKU cannot accept a sensor.
Airtac SI63 Standard Cylinder SI63BX25 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX25 |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAI63BX25 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 SAI63BX25 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 SI63BX25
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | 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 SI63BX25 Is Used
Stainless Rod Clamping
Uses the SUS304 rod to resist washdown chemicals while providing 1559 N of clamping thrust for machined parts.
Short-Stroke Diverter
The 25 mm stroke offers rapid 30-800 mm/s actuation to push packages on a 63 mm bore ISO 15552 line.
Corrosive Environment Gate
Ideal for food or chemical gates where the -B stainless rod prevents rust and the 1402 N pull force moves doors.
Replacing the Airtac SI63 Standard Cylinder SI63BX25 with the SAI63BX25
To replace the SI63BX25, order the SAI63BX25. Confirm the ISO 15552 interface, 63 mm bore, 25 mm stroke, G3/8 port, and SUS304 rod. Sizing both ways: a 50 mm bore yields 982 N [email protected], while an 80 mm bore yields 2513 N. This plain cylinder lacks a -S magnet, so it cannot take CS1-B/DS1-B switches; order an SAI63BX25S if sensing is needed. For load holding on air loss, the cushion only decelerates; add a pilot check valve or use the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX25
- ✓ 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 SI63BX25 FAQ
Yes, the SI63BX25 is discontinued. The direct replacement is the SAI63BX25. It shares the same ISO 15552 mounting interface, 63 mm bore, 25 mm stroke, G3/8 port, and force, fitting existing fixtures perfectly.
The 63 mm bore has a G3/8 port. It generates 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a max force of 318 kgf at 1.0 MPa. The rod is 20 mm with an M16x1.5 thread.
Request a Quote for the SAI63BX25
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX25 replacement — usually within 7-8 hours.