Salient Features

  • Made from close grained plain cast iron conforming to grade FG: 220 of IS: 210 (equivalent to GG20 / FT20 / 30-A). Higher grades also offered on request.
  • Castings stress relieved to relieve internal stresses.
  • Hand scraped surface finish.
  • Offered in square, rectangular and round sizes.
  • Constructional features of square and rectangular sizes similar to those of Cast Iron Surface Plates as per IS: 2285.
  • Plates up to 630 x 630 mm provided with handles for lifting. Larger plates provided with cored holes in peripheral for lifting by mechanical means.
  • Provided with 3 x 3 mm groves at a nominal pitch distance of 25 to 30 mm on top surface.
  • Supplied with rexine cover for top surface protection.

 

Standard Sizes of Lapping Plate

Square & Rectangular sizes
( L & B )
Flatness accuracy in micronsRound Sizes
(Diameter)
Tolerances on overall deviation
from flatness in microns.
Sizes in mmGrade 0Grade 1Sizes in mmGrade 01
250 x 25047100512
400 x 25048150513
400 x 40059200513
630 x 400510250614
630 x 630510300614
1000 x 630612400716
1000 x 1000714600716