This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX175H, 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 SI63BX175H
The AirTAC Airtac SI63 Standard Cylinder SI63BX175H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 175mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX175H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke175 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX175H
- 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 SI63BX175H
The AirTAC SI63BX175H is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 175mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. This specific SKU features a SUS304 stainless piston rod (-B) and high-temp Viton H seals rated for 0 to 150 C. Because it lacks the -S magnet, it cannot accept a position sensor.
AirTAC replaced the SI line with the SAI63BX175H, a direct sharing the same ISO 15552 mounting interface, stroke, and output force. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI63 Standard Cylinder SI63BX175H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX175H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX175H |
| Bore size | Ø63 mm |
| Stroke | 175 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 SAI63BX175H 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 SAI63BX175H 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 SI63BX175H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×175 | 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 SI63BX175H Is Used
High-Temp Forming Press
Actuates tooling in a heated environment where the Viton H seal and SUS304 rod withstand 150 C ambient temperatures and resist corrosion.
Clamp and Hold Station
Provides 2182 N clamping force at 0.7 MPa on machining fixtures, requiring an external pilot check valve to maintain hold during air drops.
Replacing the Airtac SI63 Standard Cylinder SI63BX175H with the SAI63BX175H
To replace this SI cylinder, order the SAI63BX175H. It drops directly into existing fixtures via the identical ISO 15552 mounting interface, matching the 63mm bore, 175mm stroke, M16x1.5 rod thread, and G3/8 port. Confirm your mounting accessory (LB, FA, TC, etc.) and retain the -B SUS304 rod and -H Viton seal requirements for high-temp or corrosive settings. If you need position sensing, you must select an SAI variant with a magnet, as this no-S SKU cannot take a switch. For sizing alternatives, a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore provides 2513 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX175H
- ✓ 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 SI63BX175H FAQ
Yes, the SI63BX175H is discontinued. The direct replacement is the SAI63BX175H. It shares the identical ISO 15552 mounting interface, 63mm bore, 175mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly while upgrading the piston seal.
The 63mm bore uses a G3/8 port. Force output is 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. The rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX175H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX175H replacement — usually within 7-8 hours.