This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX85, 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 SI63BX85
The AirTAC Airtac SI63 Standard Cylinder SI63BX85 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 85mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX85, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX85
- 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 SI63BX85
The AirTAC SI63BX85 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 85 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX85, matching the bore, stroke, force, port, and ISO 15552 mounting interface exactly. This specific SKU features a SUS304 stainless steel rod for corrosion resistance but lacks a magnet, so it cannot accept position switches.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts without live air; use an external rod lock or pilot check valve for load holding, as cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX85 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX85 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX85 |
| Bore size | Ø63 mm |
| Stroke | 85 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 SAI63BX85 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 SAI63BX85 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 SI63BX85
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×85 | 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 SI63BX85 Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS304 rod to clamp aluminum or steel parts with 1559 N of force.
Pallet Stop Gates
Acts as a robust stopper in pallet flow systems, utilizing the ISO 15552 mounting interface for easy integration into existing framework.
Replacing the Airtac SI63 Standard Cylinder SI63BX85 with the SAI63BX85
To replace the discontinued SI63BX85, order the SAI63BX85. Verify your ISO 15552 mounting fixtures (LB, FA, TC, etc.), the 85 mm stroke, and the G3/8 port. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, specify a magnet on the SAI order. For loads needing holding power on air loss, step up to the SAIL or BSAI lock variants, or SAIF for a built-in valve. At 85 mm stroke, side-load risks are low, but always guide the rod. If downsizing, a 50 mm bore gives 982 N push; if upsizing, an 80 mm bore yields 2513 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX85
- ✓ 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 SI63BX85 FAQ
Yes, the SI63BX85 is discontinued. The direct replacement is the AirTAC SAI63BX85. It shares the exact same ISO 15552 mounting interface, 63 mm bore, 85 mm stroke, output force, and G3/8 port, fitting directly into your existing fixtures.
This double-acting cylinder features a G3/8 air port and an M16x1.5 rod thread. It delivers 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 theoretical maximum of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63BX85
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX85 replacement — usually within 7-8 hours.