Machined Gear Flange MT and PT Exam Flaw Specimen (Inch Version) Carbon Steel Machined Gear Flange MT and PT Exam Flaw Specimen Machined Gear Flange Magnetic Particle/Liquid Penetrant Exam Flawed Specimens. Geometry: 4.6" OD x 1.5" bore. Flaws: 3, randomly placed Standard Tolerance: +/-0.150" (4mm). Documentation: NDT Verification Reports,C of C, CAD Drawings and Test Sheets. Material: Carbon Steel. Customized Calibration Test Block and Flaw Specimen also available.