This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X175STC, 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 SI63X175STC
The AirTAC Airtac SI63 Standard Cylinder SI63X175STC 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 SAI63X175STC, 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 → SAI63X175STC
- 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 SI63X175STC
The AirTAC SI63X175STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 175 mm stroke, and a G3/8 port. Delivering 1559 N push force at 0.5 MPa, it is replaced by the SAI63X175STC. This direct upgrade shares the exact TC trunnion mounting interface, M16x1.5 rod thread, and output force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For load holding, note that a standard cylinder drifts without live air; the cushion only decelerates. Use the SAIL lock or BSAI clamp-lock variants if needed.
Airtac SI63 Standard Cylinder SI63X175STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X175STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X175STC |
| 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 SAI63X175STC 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 SAI63X175STC 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 SI63X175STC
| 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 SI63X175STC Is Used
Mid-Tonnage Clamping
Holds workpieces securely in CNC machining fixtures using the 1559 N push force at 0.5 MPa.
Package Diversion
Actuates routing gates on 63 mm bore assembly lines, cycling safely at 30-800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63X175STC with the SAI63X175STC
To replace the SI63X175STC, order the SAI63X175STC. Confirm the ISO 15552 TC trunnion mounting, 63 mm bore, 175 mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 50 mm bore yields 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. The 63 mm bore provides 1559 N push and 1402 N pull @0.5 MPa, peaking at 318 kgf @1.0 MPa. For this 175 mm stroke, guide external rods to prevent side-load wear. If the load must be held during air loss, do not rely on the air cushion; add a pilot check valve, external rod lock, or switch to the SAIL/BSAI lock variant. The SAI family also adds the SAIF self-valve option (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X175STC
- ✓ 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 SI63X175STC FAQ
Yes, the SI63X175STC is discontinued. The direct replacement is the SAI63X175STC. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 175 mm stroke, G3/8 port, and TC mounting interface.
The 63 mm bore features a G3/8 air port and 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 max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X175STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X175STC replacement — usually within 7-8 hours.