Custom Quartz Discs

Round quartz plate stock, cut to diameter and thickness, with center holes, bolt holes, or edge features added where your fixture needs them.

Diameter, thickness, and flatness move together — a large, thin disc holds flatness less easily than a smaller or thicker one at the same spec. Confirm all three together.

Available Shapes, Sizes and Surface Options

Standard disc is round with a plain edge, as-cut or ground face. Polished surface is available where the application needs an optical-quality finish rather than a functional flat.

Center Holes, Bolt Holes and Edge Features

Center holes and bolt-circle patterns are added by mechanical or diamond drilling down to about Ø0.8 mm at ±0.02 mm, or by laser for finer openings — send hole diameter, position, and bolt circle diameter (PCD) together, since PCD and hole position tolerance are checked as one feature, not separately. Edge options are plain (as-cut), ground, or chamfered.

Quartz Disc Diameter and Thickness Options

Thickness range narrows somewhat at the largest diameters — a very large, very thin disc is the hardest combination to hold flat, so confirm both dimensions together rather than assuming any thickness is available at any diameter. Before shipment we check diameter, thickness, roundness, flatness, hole diameter and position, edge condition, and surface defects.

Ø5–500 mmReference Diameter

±0.05–0.10 mmDiameter Tolerance

12Common Diameter Sizes

<0.25 × 45°Reference Edge Chamfer

JGS1 / 2 / 3Material Options

Solid or DrilledDisc Configurations

Define the Disc

Diameter, Faces and Edge Must Be Specified Together

Controlled Feature	Reference Capability / Requirement
Diameter	Ø5–500 mm industry-reference rangeFinal size capability depends on thickness, material and finish
Diameter Tolerance	Reference ±0.05–0.10 mm
Thickness	Specified with tolerance and polishing allowance
Flatness / Parallelism	Applied to the functional face or clear aperture
Surface Quality	80/50 functional / 60/40 precision / 40/20 optical reference levels
Center Hole / PCD	Hole diameter, bolt-circle diameter, count and angular datum
Edge	Reference chamfer <0.25 × 45° or drawing-specific bevel, flat or notch

Diameter Series

Common Disc Sizes Before Custom Machining

Reference Diameter	Typical Starting Form	Quote-Critical Detail
Ø10 / 15 / 20 / 25.4 mm	Small optical or sensor disc	Thickness, surface and edge
Ø30 / 40 / 50 / 60 mm	Window, cover or coating blank	Clear aperture and parallelism
Ø76.2 / 100 / 150 / 200 mm	Large disc or process component	Flatness, handling edge and material grade
Up to Ø500 mm	Large custom disc	Drawing review for thickness, support and finish

Disc Forms

Circular Parts Ready for the Assembly

Solid DiscRound plate for covers, windows, spacers and coating blanks

Center-Hole DiscControlled central opening for shafts, flow or beam access

Bolt-Pattern DiscPCD, hole count and angular orientation on one datum

Flat or Notched DiscEdge flat, notch or custom profile for positive orientation

Applications

Where Circular Geometry Simplifies the Interface

Windows & CoversRound protective or transmitting interfaces for instruments and chambers

Coating BlanksPolished discs prepared around clear aperture and edge handling

Masks & SensorsCircular substrates with center holes, flats or indexed features

Spacers & SupportsGround or polished quartz discs for thermal and clean equipment

Product Examples

Product Forms and Finished Components

Need a quartz disc with controlled faces and edge?Send diameter, thickness, flatness, parallelism, surface quality, hole pattern and chamfer drawing.

Open the Plate Configurator

Engineering Data

Grade-Qualified Material Purity

Electric-fused / flame-fused quartz: SiO₂ ≥99.99%; synthetic JGS1-grade fused silica: ≥99.999%. Grade and lot certificate govern supplied material.

Engineering Data

Large Ingot-Cut Disc Line

Series	Diameter	Thickness	Dimensional acceptance
Precision-machined	Ø5–500 mm	By drawing	Diameter ±0.05–0.10 mm
Ingot-cut large disc	Up to Ø1800 mm	5–200 mm	Cut blank dimensions and finishing allowance agreed separately

The precision diameter tolerance applies to the machined series. It does not automatically apply to an Ø1800 mm blank.