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Proven Quality – Built on decades of South African engineering excellence
designed for stable internal turning at depths up to 4×D (four times the bar diameter)
Compatible with S14 insert screws and K14 Torx keys
it is ideal for machining fine threads in confined or deep-hole geometries
Insize Optical Flat Ø45mm Flatness 0.1µm Series 4191-45B Carmex Internal UN Threadmill Insert 40mm/ 6 TPI Proven Quality – Built onThe Insize 4191 45B Optical Flat is a precision inspection tool designed for checking surface flatness with extremely high accuracy. Manufactured for precision engineering, metrology, and calibration applications, this optical flat provides reliable flatness verification for precision surfaces, gauge blocks, measuring tools, and machine components. Featuring a single working face identified by an arrow marking, the optical flat allows accurate
