Cast Iron Lapping Plates
JASH Cast Iron Lapping Plates are extensively used for accurate hand lapping of metal parts to obtain a perfect oil tight fit.
- Made from close grained plain cast iron conforming to grade FG: 220 of IS: 210 – 1978.
- 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.
- Flatness accuracy as mentioned in table underneath.
- Plates up to 630 x 630 mm provided with handles for lifting. Larger plates provided with cored holes in peripheral ribbing for lifting by mechanical means.
- Provided with 2 mm x 1 mm cross rectangular groves on top surface.
- Supplied with Rexene cover for top surface protection.
- Other sizes offered upon request.
Square & Rectangular sizes (L & B ) |
Flatnessaccuracy in microns |
Round Sizes (Diameter) |
Tolerances on overall deviation from flatness in microns as per DIN 876 |
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| Sizes in mm | Grade 0 | Grade 1 | Sizes in mm | Grade 0 | Grade 1 | ||
| 250 x 250 | 4 | 7 | 100 | 5 | 12 | ||
| 400 x 250 | 4 | 8 | 150 | 5 | 13 | ||
| 400 x 400 | 5 | 9 | 200 | 5 | 13 | ||
| 630 x 400 | 5 | 10 | 250 | 6 | 14 | ||
| 630 x 630 | 5 | 10 | 300 | 6 | 14 | ||
| 1000 x 630 | 6 | 12 | 400 | 7 | 16 | ||
| 1000 x 1000 | 7 | 14 | 600 | 7 | 16 | ||