A disc is round plate stock — the purchasing driver is diameter and thickness rather than L×W, and discs are commonly drilled or polished for a specific fit (sight glass, optical window blank, gauge replacement disc).
Dimensions & Tolerance
| Parameter | Specification |
|---|---|
| Diameter | Per drawing |
| Thickness | Per drawing |
| Diameter tolerance | Follows the same size-banded tolerance as Quartz Plates & Sheets (±0.05–0.5mm depending on size) |
| Thickness tolerance | Follows the same thickness-banded table as Quartz Plates & Sheets |
Surface & Edge
- Polished, ground, or as-cut face finish
- Edge: square-cut, chamfered, or ground round-over depending on installation
- Drilled center or off-center hole available — see Perforated / Slotted / Grooved Plates for multi-hole or patterned drilling
Application
- Sight glass and gauge replacement discs (see also Quartz Gauge & Sight Tubes)
- Optical window blanks before final grade-specific polishing (see Optical Quartz Plates & Windows)
- General round viewing ports and industrial fixture components
Material
Clear fused quartz standard; opaque/milky available for thermal-shielding disc applications.
FAQ
Can a disc be drilled with a center hole for mounting?
Yes, per drawing — for multiple holes or a specific pattern, see Perforated / Slotted / Grooved Plates.
What edge finish should I specify for a sight-glass replacement disc?
Ground square edge is standard for gasket sealing fit — confirm against your existing gauge/sight glass housing.