Hegman Gauges are easy to use, relatively inexpensive production and quality control instruments that enable the manufacturer to check for unwanted particles that are too large. Hegman gauges and associated scrapers are consumable products and need to be refinished or replaced when they show visible damage to the gauging surface or readings become suspect. Long form certification is available at an additional cost for grind gauges and scrapers but is almost always included FREE when you purchase your grind gauges online through our website.
Precision Gage & Tool Co has created thousands of custom gauges since 1932 for customers in various industries. Please Contact PG&T and we will be glad to assist you in deciding if one of our standard gauges may work for you or if you would be better served by using one of our custom fineness of grind gauge.
Hegman, micron, mils and NPIRI are common scales on Fineness of Grind Gauges, wedge plates and printing plates. P.C. scale or the N.S. scale (In 1968 PG&T changed N.S. to H for Hegman) are sometimes used on older gauges.
Gauges by Industry
Precision Gage & Tool Co. adapted gauges for use in the ink (ASTM D1316) and other coatings industries. Other industries such as the food, cosmetic, pharmaceutical, nano material, adhesive, petroleum, battery and other slurry products now also use the Fineness of Grind Gauges in many areas of manufacturing from QC and R&D applications to on the floor and in process testing.
Precision Gage & Tool also offers a variety of other physical test equipment items that include but are not limited to Wet Film Applicators and Cross-Cut Adhesion Test Kits. For a more extensive product listing download our Grind Gauges Catalog or contact us.
Follow this link for a basic grind gauges chart showing the specifications and a description of the typical application for each grind gauge category.
Scale and Units of Measurement
Mils – The equivalent of .001 inches, the Mils Scale is the most widely used unit of measurement regarding fineness of grind gauging equipment.
Microns – For a point of reference, 25 Microns is equal to 1 Mil. The commonly used Micron is usually rounded to .00004 inches for practical purposes of measurement.
NPIRI Scale – Designed for ink gauges, the NPIRI Scale was developed by the National Printing Ink Research Institute. The NPIRI scale begins at 0 (zero) and extends to 10 at the point of depth equal to .001 inches. Although somewhat arbitrary, the scale is logical in that each division is equal to one tenth of a mil or 2.5 microns.