import type { TapInput, TapResult } from './types.js';
/**
 * Calculate tap drill size and thread dimensions.
 *
 * For metric threads (ISO):
 * - Thread height H = 0.866025 x pitch (sqrt(3)/2 x p)
 * - Minor diameter = Major diameter - 2 x (5/8) x H = D - 1.0825 x p
 * - Tap drill for 75% thread = Major diameter - pitch
 * - General formula: Tap drill = D - (2 x H x %/100)
 *
 * For Unified threads (UNC/UNF):
 * - Convert TPI to pitch: p = 25.4 / TPI
 * - Same formulas apply
 *
 * The 0.866025 and 1.0825 factors are the geometry of the 60 degree basic profile, not
 * chosen constants. The thread percentage is a shop choice on top of that geometry: 75%
 * is the usual default because it keeps most of the strength for much less tapping
 * torque, but it is a convention, and no standard prescribes it.
 *
 * @reference ISO 68-1, basic profile for ISO general purpose metric screw threads.
 */
export declare function tap(input: TapInput): TapResult;
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