Machined Gear Flange MT and PT Exam Flaw Specimen (Metric Version) Carbon Steel Machined Gear Flange MT and PT Exam Flaw Specimen Machined Gear Flange Magnetic Particle/Liquid Penetrant Exam Flawed Specimens. Geometry: 115mm OD x 38mm bore. Flaws: 3, randomly placed Standard Tolerance: +/-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.