This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX75, 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 SI63BX75
The AirTAC Airtac SI63 Standard Cylinder SI63BX75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 75mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke75 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX75
- 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 SI63BX75
The AirTAC SI63BX75 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 75 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The SUS304 stainless steel rod (-B) provides corrosion resistance. Because this SKU lacks a magnet, it cannot accept a position switch.
The direct replacement is the SAI63BX75. It shares the exact ISO 15552 mounting interface, M16x1.5 thread, and 318 kgf max force. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure.
Airtac SI63 Standard Cylinder SI63BX75 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX75 |
| Bore size | Ø63 mm |
| Stroke | 75 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 SAI63BX75 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 SAI63BX75 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 SI63BX75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×75 | 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 SI63BX75 Is Used
Stainless Rod Actuation
Ideal for moderate-force machinery tasks requiring the corrosion resistance of the SUS304 rod in washdown or humid factory settings.
Line Diverting
Provides reliable 75 mm stroke movements to push packages or redirect goods on manufacturing lines at up to 800 mm/s.
Gate Operation
Drives heavy access gates or material routing flaps with a robust 1559 N push force at standard 0.5 MPa operating pressure.
Replacing the Airtac SI63 Standard Cylinder SI63BX75 with the SAI63BX75
To replace the SI63BX75, order the SAI63BX75. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G3/8 air port, and the M16x1.5 rod thread. If sizing up or down, neighbor bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Note that a plain cylinder drifts on air loss; the 30 mm adjustable cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. This non-magnetic SKU cannot take a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX75
- ✓ 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 SI63BX75 FAQ
Yes, the SI63BX75 is discontinued. The direct replacement is the AirTAC SAI63BX75. It matches the ISO 15552 mounting interface, 63 mm bore, 75 mm stroke, force, and G3/8 port, fitting your existing fixtures perfectly.
The G3/8 port feeds a 63 mm bore yielding 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, and 2805 N at 0.9 MPa. The theoretical max force is 318 kgf at 1.0 MPa.
Request a Quote for the SAI63BX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX75 replacement — usually within 7-8 hours.