Diameter of Clearance Holes and Counterbores for Bolts and Screws
Dimensions of bolt hole diameter and bore diameter
|Nominal diameter of thread||Bolt hole diameter dh||Chamfering e||Bore diameter D′|
|Grade 1||Grade 2||Grade 3||Grade 4＊|
- Grade 4 primarily applies to cast holes.
- Among the nominal diameter and bolt hole diameter of screws specified in this table, dimensions in parentheses are those not specified in ISO 273.
- Perform hole chamfering as necessary and the chamfer angle shall be 90 degrees in principle.
- If diameter larger or smaller than the bore diameter in this table is required for nominal diameter of a certain screw, it is recommended to select values from bore diameter row in this table as long as possible.
- The bore face should be perpendicular to the center line of the hole and generally bore depth should be adjusted so that the block scale can be removed.
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