This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX75N, 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 SI63BX75N
The AirTAC Airtac SI63 Standard Cylinder SI63BX75N 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 SAI63BX75N, 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 → SAI63BX75N
- 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 SI63BX75N
The AirTAC SI63BX75N is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 75mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa through a G3/8 port. The direct replacement is the SAI63BX75N, matching the interface, force, and stroke.
This -B variant features a SUS304 stainless piston rod for corrosion resistance, and the -N seal specifies NBR for -20 to +70C. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. As a no-magnet SKU, it cannot take a sensor.
Airtac SI63 Standard Cylinder SI63BX75N Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX75N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX75N |
| 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 SAI63BX75N 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 SAI63BX75N 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 SI63BX75N
| 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 SI63BX75N Is Used
Stainless Rod Clamping
Ideal for fixture clamping in washdown areas where the SUS304 rod resists corrosion and the 1559N force secures heavy parts.
NBR Sealed Diverters
Drives conveyor diverting arms in ambient conditions, using the 75mm stroke to push products efficiently at up to 800mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63BX75N with the SAI63BX75N
To replace the SI63BX75N, order the SAI63BX75N. Confirm the ISO 15552 mounting interface, 63mm bore, 75mm stroke, G3/8 port (PT/G/NPT), and your specific mounting accessory. The -B stainless rod and -N NBR seals must be specified on the new order. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; add the magnet if position detection is needed. Sizing both ways: a 50mm bore offers 982N push at 0.5MPa, while an 80mm bore yields 2513N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX75N
- ✓ 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 SI63BX75N FAQ
Yes, the AirTAC SI63BX75N is discontinued. The direct replacement is the SAI63BX75N. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 75mm stroke, G3/8 port, and mounting interface. The SAI features an upgraded two Y-shaped piston seal for lower start-up pressure.
The 63mm bore uses a G3/8 port with a 20mm rod and M16x1.5 thread. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and 2805N at 0.9MPa. The theoretical maximum is 318kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX75N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX75N replacement — usually within 7-8 hours.