Lapping Plate | JASH Metrology

Lapping Plate

  • Overview
  • Salient Features
  • Standard Size

JASH C.I. Lapping Plates are extensively used for accurate hand lapping of ferrous & non-ferrous parts to obtain a perfect oil tight surface.

  • 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.
Square & Rectangular sizes
( L & B )
Sizes in mm
250 x 250
400 x 250
400 x 400
630 x 400
630 x 630
1000 x 630
1000 x 1000
Flatness accuracy in microns
Grade 0 Grade 1
4 7
4 8
5 9
5 10
5 10
6 12
7 14
Round Sizes
(Diameter)
Sizes in mm
100
150
200
250
300
400
600
Tolerances on overall deviation
from flatness in microns.
Grade 0 Grade 1
5 12
5 13
5 13
6 14
6 14
7 16
7 16