Grade 00 Granite Straightedge

Grade 00 Granite Straightedge

Laboratory Master Reference Standard

The Grade 00 Granite Straightedge represents the pinnacle of dimensional accuracy and stability,manufactured to the most stringent international tolerances for laboratory,national standard,and ultra-high-precision master reference applications.It is the definitive artifact for establishing and verifying geometric truth where the highest order of precision is non-negotiable.

Defining Grade 00 Accuracy

As defined by prevailing standards(e.g.,ISO 8512,similar to former AA grade),Grade 00 specifies the tightest permissible tolerances for flatness and straightness.This grade is reserved for tools used in:

Primary Calibration Laboratories:For calibrating other high-grade straightedges and surface plates.

National Metrology Institutes&Standards Rooms:As a fundamental reference standard.

Critical Research&Development:Where measurement uncertainty must be minimized to the absolute lowest level.

Uncompromising Manufacturing Protocol

The creation of a Grade 00 straightedge demands an extraordinary level of control and craftsmanship:

Exquisite Material Selection:Fabricated from the finest,most stable,stress-relieved black granite,characterized by its ultra-fine grain and homogeneous structure.

Master Lapping in Controlled Environments:Final lapping and finishing are conducted in meticulously temperature-and humidity-stabilized cleanrooms to prevent any thermal or environmental distortion during the critical final machining stages.

Nanometer-Level Finishing:Surfaces are brought to an optical-grade finish,achieving near-perfect flatness and edge straightness measured in single-digit microns over the entire length.

Absolute Geometric Integrity:Every functional surface and edge is perfected to ensure not only flatness but also perfect perpendicularity and parallelism as specified.

Verification&Certification

Each Grade 00 straightedge is a unique,documented artifact:

Ultra-Precise Metrology:Final inspection is performed using the most advanced equipment available,such as laser interferometers,electronic autocollimators,or CMMs of superior accuracy,in a controlled master lab environment.

Comprehensive Certification:Supplied with a detailed calibration certificate that documents the actual measured flatness and straightness values at multiple points across its length,with full metrological traceability to international standards.

Individual Serialization:Each tool is permanently and uniquely serialized,with its certification tied directly to that serial number for its entire service life.