Borosilicate Glass Glass With Countersunk Holes – Borosilicate Glass (CTE 3.3 x 10^-6 /K, 360 nm – 2.0 um); 82 or 90 degree countersinks on holes from 2 mm. No minimum order; DFM review included with every RFQ.
A drawing for borosilicate glass glass with countersunk holes is mostly a conversation about edges and datums. We produce them in Borosilicate Glass at 82 or 90 degree countersinks on holes from 2 mm, with depth +/-0.05 mm as the controlling tolerance, and finish the perimeter per spec.
Specification envelope
| Material | Borosilicate Glass (3.3 expansion group per ISO 3585) |
|---|---|
| Thermal expansion (CTE) | 3.3 x 10^-6 /K |
| Service temperature | 450 C continuous |
| Transmission range | 360 nm – 2.0 um |
| Density | 2.23 g/cm3 |
| Knoop hardness | 480 kg/mm2 |
| Refractive index | 1.473 @ 587 nm |
| Stock thickness | 0.50 – 30 mm |
| Maximum blank size | 600 x 400 mm |
| Geometry | Glass With Countersunk Holes |
| Size envelope | 82 or 90 degree countersinks on holes from 2 mm |
| Key tolerance | depth +/-0.05 mm |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
What the process holds
Beyond this page, Borosilicate Glass routinely runs through lapping, ultrasonic machining, etching, polishing in our shop – most real parts combine two or three of these steps.
Production route: drilling, cnc machining – selected per geometry and volume. Edge condition: optional chamfered hole entry.
Specification advice
Three items decide most of the cost and lead time on this work:
- Material note: sheet stock carries more thickness variation than float wafer stock, so lapping is often the first step.
- Hold the controlling dimension (depth +/-0.05 mm) and let secondary dimensions carry standard tolerance – it is the single biggest cost lever.
- Over-specification is the quiet budget killer: a 20/10 scratch-dig face costs roughly three times an 80/50 face, so grade each surface individually.
For the complete framework, see the tolerance design guide and the holes and edges design guide.
Who orders this
borosilicate glass glass with countersunk holes shows up across medical diagnostics (flow cells, slides, microplate bottoms, cuvette windows); scientific instruments (reference flats, cells, prism mounts, stage inserts); laboratory instruments (cuvettes, sight glasses, stir-cell windows). Background reading on the underlying material science: ISO 3585 borosilicate glass 3.3.
Dimensions still moving? Configure this part live in the 3D + 2D builder below, or open the full custom glass machining 3D + 2D builder to start from a blank canvas.
For adjacent specifications, see glass-bottom microplates, AR coating process, beam splitter glass.
Common questions
Is there a minimum order for borosilicate glass glass with countersunk holes?
No. Single prototypes are accepted, and pricing steps down at 10, 100 and 1,000 pieces.
How fast can prototypes ship?
Machined prototypes ship in 5 – 10 working days. Coated or bonded parts add 1 – 2 weeks depending on queue slots.
What files do you need for a quote?
A dimensioned PDF plus DXF or STEP geometry. If only a sketch exists, our drawing review service formalizes it before quoting.
Do parts ship with inspection data?
Dimensional reports, surface certificates and material certs per melt are available; specify the level on the RFQ.
Specifications on this page were last reviewed by our engineering team in September 2026.