Granite Inspection Straightedge

Professional-Grade Reference for Critical Verification

The Granite Inspection Straightedge is the definitive tool for precision measurement and verification in quality control,machine tool alignment,and metrology applications.Engineered from high-density natural granite,it provides a stable,wear-resistant,and geometrically true reference for assessing flatness and straightness with confidence.

Core Performance Attributes

Intrinsic Metrological Stability:Granite’s exceptionally low thermal expansion ensures the straightedge maintains its critical geometry across varying environmental conditions,guaranteeing measurement repeatability.

Superior Vibration Damping:The material's natural density effectively absorbs ambient vibrations,providing a"quiet,"stable base for sensitive visual and comparative inspection methods.

Long-Term Geometric Integrity:Harder and more wear-resistant than steel,the lapped granite surface retains its precision flatness and edge acuity for decades,preserving your calibration investment.

Neutral&Non-Conductive:Its non-magnetic,corrosion-proof properties make it ideal for inspecting ferrous parts and for use in clean or electrically sensitive environments.

Precision Manufacturing Specifications

Inspection-Grade Accuracy:Manufactured to meet or exceed recognized industrial tolerance grades(such as Grade 0 or Inspection Grade),with tight flatness and straightness tolerances.

Masterful Surface Finish:All working edges and surfaces are precision-lapped and hand-finished to achieve the fine,consistent texture required for accurate visual gap inspection and reliable contact.

Rigid Cross-Sectional Design:Typically features a robust'I'-beam or rectangular profile to ensure maximum stiffness and minimal deflection under its own weight during use.

Full Traceability:Available with individual inspection certificates that document measured flatness/straightness values,providing essential traceability for quality systems.

Primary Application Domains

Surface Plate Calibration:The standard tool for verifying the flatness and condition of granite and cast iron surface plates in calibration labs and quality departments.

Machine Tool Alignment&Maintenance:Used to check the straightness of lathe beds,milling machine ways,surface grinder rails,and other critical machine guideways.

Visual Light-Gap Inspection:Serves as the master reference for the traditional and highly sensitive method of assessing flatness by observing the gap between the straightedge and a workpiece.

Precision Layout&Assembly:Provides a true straight line for scribing,component alignment,and fixture setup in toolrooms and assembly areas.