import type { BoltInput, BoltResult } from './types.js';
/**
 * Calculate bolt torque and preload relationship.
 *
 * Formulas:
 * - T = K * D * F (Torque-tension relationship)
 *   T = torque (N-m)
 *   K = nut factor (K-factor), typically 0.15-0.25
 *   D = nominal bolt diameter (mm)
 *   F = preload force (N)
 *
 * - Tensile stress area: As = (pi/4) * (d - 0.9382*p)^2
 *   (ISO metric thread formula)
 *
 * K-factor typical values:
 * - Dry (unlubricated): 0.20
 * - Oiled (machine oil): 0.15
 * - Moly (MoS2 grease): 0.12
 * - PTFE (Teflon): 0.10
 *
 * Reference: Machinery's Handbook, VDI 2230
 */
export declare function bolt(input: BoltInput): BoltResult;
/**
 * Get K-factor for common lubrication conditions
 */
export declare function getKFactor(condition: string): number;
/**
 * Get standard ISO metric thread pitch for nominal diameter
 */
export declare function getStandardPitch(diameter: number): number;
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