+1 (954) 946-9454

Grind Gages - µm / Hegman / NPIRI for Printing Ink, 2 paths

Article No. 2509

Grind Gage No. 6251 - G1
Grind gage - groove depth range 0-25 µm / 0-10 NPIRI

  • Path Size: 1 x 6.25 in
  • No. of Paths: 2
  • Scales: Hegman/Micron/NPIRI
  • Range: 8 - 6/0 - 25/0 - 10

More options



$716.00 excl. taxes & shipping cost


The Fineness of Grind Gage is a flat steel block in the surface of which are two flat-bottomed grooves varying uniformly in depth from a maximum at one end of the block to zero near the other end. Groove depth is graduated on the block according to one or more scales used for measuring particle size.

The Hegman scale or National Standard scale may be abbreviated "NS" on the gage. The scale ranges from 0 to 8 with numbers increasing as the particle size decreases.

  • 0 Hegman = 4 mil/100 micron particle size
  • 4 Hegman = 2 mil/50 micron particle size
  • 8 Hegman = 0 mil/0 micorn particle size

NPIRI scale:

National Printing Ink Research Institute. The scale begins with "0" at the infinite point and extends to "10" at a depth of .001 inches. While it is an arbitrary scale, it is a logical one in that these divisions are equivalent of tenths of mils.

  • Grind blocks made of high quality, corrosion resistant stainless steel for extended use
  • Dual channel designs
  • Groove depth is graduated on the block showing µm, Hegman and NPIRI scales

Technical Attributes

    Technical Specifications

  • Path Size
    1 x 6.25 in
  • Scales
    µm, Hegman, NPIRI
  • No. of Paths
  • Range
    0 - 25 µm
  • Range
    0 - 10 NPIRI
  • Range
    8 - 6 Hegman
  • General

  • Weight
    5 kg
  • Weight
    11 lb
  • Dimensions: L x W x H
    9.5 x 3.5 x 0.75 in





D333 D1210 D1316 D6846


Place a slight excess of sample in the deep end of the groove and, with the straight-edge scraper provided, draw the sample toward the shallow end of the groove. Ratings are in terms of the point on the scale where the oversize particles, or traces made by them, first appear in substantial concentration.

Delivery Content

Grind block
Scraper (2514)
Storage case
Join our Email List. subscribe