Granite Solutions
Five-face master squares
Granite reference surfaces
Granite solutions are reference surfaces and standards of extremely high flatness and stability. Starrett makes them in Crystal Pink® and Superior Red granite—the latter with the highest quartz content for greater wear resistance—in AA (laboratory), A (inspection) and B (shop) grades.
Granite five-face master squares check perpendicularity (90°) with laboratory accuracy; their five usable faces allow multiple references without magnetism.
Main features
High-flatness reference surface
Grades AA (laboratory), A and B
Stable, durable black granite
Brand
Typical applications
- Reference surface for inspection
- Layout and marking base
- Mounting of measuring instruments
- Flatness verification
- Height gage base
- Inspection of machined parts
- Instrument calibration
- Metrology laboratory
- Quality control
Featured products
| Size / Model | Grade | Description |
|---|---|---|
| 300 mm (12") | AA | Granite master square, 5 faces. |
| 450 mm (18") | AA | Perpendicularity verification. |
| 600 mm (24") | AA | For larger parts. |
Note: The data shown is for reference only and may vary depending on the model, the manufacturer and the conditions of use.
Related products
Surface platesReference plane for part inspection and layout.
Surface plate standsSteel stands that support and stabilize surface plates.
Surface plate coversCompact surfaces for portable inspection of small parts.
Tri-squaresEconomical option for checking machine and CMM axes.
Angle platesVertical workholding for inspection and machining.