Granite inspection plate supplier

Precision Granite Solutions

Global Supplier of Certified Granite Inspection Plates&Metrology Foundations

Corporate Identity:The Standard in Measurement Certainty

Precision Granite Solutions(PGS)is a world-leading specialist manufacturer and supplier of certified granite inspection plates,surface plates,and precision granite components for industrial metrology,quality control,and high-accuracy manufacturing.We provide the traceable foundation for global quality assurance systems across aerospace,automotive,medical,and advanced research sectors.

Product Philosophy:Accuracy by Design

Every PGS product begins with a singular focus:to be the most stable,reliable,and certified reference datum in your measurement chain.We don't just supply granite—we deliver guaranteed geometric integrity backed by full metrological documentation.

Core Product Lines

1.Certified Granite Surface Plates

The absolute reference plane for all dimensional measurement.

Accuracy Grades(Per ANSI/ASME B89.3.7&ISO 8512-2):

Grade AA(Laboratory):±0.000025"per foot(±0.00063mm/m)

Grade A(Inspection):±0.000050"per foot(±0.00125mm/m)→Most Common

Grade B(Toolroom):±0.000100"per foot(±0.0025mm/m)

Standard Stock Sizes(Grade A):

Size(W×L)Thickness Approx.Weight Calibration Interval

24"×36"4"450 lbs 12 months

36"×48"6"1,200 lbs 12 months

48"×72"8"2,800 lbs 12 months

72"×96"10"5,500 lbs 12 months

96"×120"12"9,000 lbs 12 months

Custom sizes up to 144"×288"available.

2.Granite Inspection&Layout Tables

Enhanced platforms with fixturing capability for production inspection.

Grid Pattern Tables:Precision-drilled hole patterns(16mm/5/8"/3/4"on 100mm/4"centers)for modular fixturing.

T-Slot Tables:For flexible clamping of large components.

Black&Gray Granite Options:Technical consultation provided for material selection.

3.Granite Reference Accessories

Granite Straight Edges:Type I(Rectangular)&Type II(Wide-Web)

Granite Squares&Angle Plates:90°±2 arc-seconds

Granite Parallels&V-Blocks:For part elevation and positioning

Granite Sine Bars&Plates:For precise angle measurement

4.Specialized Granite Bases

CMM Foundations:Vibration-damped bases for coordinate measuring machines

Optical Comparator Tables:For vision system stability

Laser Tracker Mounts:Kinematic mounting platforms

Assembly&Inspection Systems:Custom-configured workstations

Technical Specifications&Material Science

Granite Material Properties:

Type:Premium Black Granite(Select Indian/Chinese/Brazilian quarries)

Density:2.95-3.05 g/cm³(minimum 2.90 g/cm³)

Hardness:6-7 Mohs Scale

Compressive Strength:>200 MPa(29,000 psi)

Thermal Expansion Coefficient:5.5-6.5×10⁻⁶/°C(½that of steel)

Thermal Conductivity:2.5-3.5 W/m·K

Vibration Damping:10-15×superior to cast iron

Surface Characteristics:

Flatness Tolerance:As specified per grade with full 3D mapping

Surface Finish:2-8µin Ra(0.05-0.20µm),precision lapped

Edge Treatment:Beveled edges standard(0.06"min),square edges optional

Surface Integrity:Free from pits,cracks,or structural defects

Certification&Documentation:

Every plate includes:

NIST-Traceable Calibration Certificate with 3D flatness contour map

Material Test Report confirming density,hardness,and composition

Certificate of Compliance with ANSI/ASME B89.3.7

Recommended Maintenance&Recalibration Guide