Spotface vs Counterbore Holes in Machining: Differences and Uses

website counterbore slot callout Machinery's handbook lists various bolt related hole sizes including counterbore These hole callouts mean: these cross-sections counterbore slot callout Counterbore Symbol

counterbore slot callout Slot length on the holeslot symbol or machine hole callout Shown here Hole information for a counterbore hole is shown on a legacy miscellaneous member  Counterbored holes are dimensioned in the sequence of their manufacture First the hole's diameter is given, then the counterbore diameter, then  Needing help dimensioning a slotted hole? Guden has some detailed information to help you in the process Click here for an explanation on slot dimensions

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