Represent holes (internal dimensions). 3. Tolerance Grades (Numbers)

Locating pins, dowels, and components that require accurate alignment but must be disassembled occasionally. Typical Designations: H7/h6, H7/js6.

According to historical DIN 7161 tables, here are some typical hole deviations for standard "H" fits: Nominal Size (mm) H7 Tolerance ( H8 Tolerance ( H11 Tolerance ( Over 10 to 18 Over 30 to 50 Over 80 to 120

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: Precision values for tolerance fields like JS9cap J cap S 9 must be perfectly clear.

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: The standard includes detailed tables for tolerance zones (marked with prefixes like "x" for reductions and "+" for additions) measured in micrometers ( Contextual Usage Inspection Standards : This document is frequently referenced alongside VDI/VDE/DGQ 2618

: Specifically used for defining the allowable deviations (tolerances) for internal cylindrical dimensions, such as drilled or bored holes.

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DIN 7161 was originally published in 1965 and has since been officially replaced/superseded by international standards: Primary Replacement DIN ISO 286-2