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COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

6.4.9 “STANDARDS“ FOR THE FLATNESS OF SURFACE PLATES

QUALITY OF THE MEASURED OBJECT:

Formulas for the different standards are as follows:

• DIN 876:
• Grade 00 <2 x (1 + L/1000) μm (L: Longer edge of plate in mm)
• Grade 0 <4 x (1 + L/1000) μm (L: Longer edge of plate in mm)
• Grade 1 <10 x (1 + L/1000) μm (L: Longer edge of plate in mm)
• Grade 2 <20 x (1 + L/1000) μm (L: Longer edge of plate in mm)

• JIS
• Grade 00 <L x 0.0015 + 1.25 μm (L: Diagonal of the plate in mm)
• Grade 0 <L x 0.003 + 2.50 μm (L: Diagonal of the plate in mm)
• Grade 1 <L x 0.006 + 5 μm (L: Diagonal of the plate in mm)
• Grade 2 <L x 0.012 + 10 μm (L: Diagonal of the plate in mm)
• GGG-P-463c
• Grade AA <40 + (D2/25) D: Diagonal in inches
Result in x.xxx inches
• Grade A <[40 + (D2/25)] x 2 D: Diagonal in inches
Result in x.xxx inches
• Grade B <[40 + (D2/25)] x 4 D: Diagonal in inches
Result in x.xxx inches
• BS 817
Length of plate Grade 0 Grade 1 Grade 2 Grade 3
in [mm] in [μm] in [μm] in [μm] in [μm]
180 3.0 Grade “0“ x 2 Grade “0“ x 4 Grade “0“ x 8
250 3.5 ditto ditto ditto
400 4.0 ditto ditto ditto
630 4.5 ditto ditto ditto
1000 5.5 ditto ditto ditto
1600 7.5 ditto ditto ditto
2000 8.5 ditto ditto ditto
2500 10.0 ditto ditto ditto

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