BoltLabTools
Interactive calculators and identification tools for fastener sizing, torque, weight, and unit conversion.
Bolt Torque Calculator
Bolt torque estimates clamp load from size, strength, and friction assumptions shown in the tool.
Open toolFastener Weight Calculator
Fastener weight scales with shank diameter, length, material density, and quantity in this estimator.
Open toolInteractive Screw Identifier
A screw identifier narrows candidates using head shape, drive recess, and thread family before you measure.
Open toolThread Identifier Tool
A thread identifier compares measured diameter and pitch (or TPI) to standard tables for likely metric or inch matches.
Open toolDrill Bit Size Converter
Drill bit sizes mix number, letter, fractional inch, and millimeter callouts in shops. Convert between systems here.
Open toolMetric to Imperial Screw Converter
Screw size conversion maps common metric diameters to closest imperial threads for stocking decisions.
Open toolTap Drill Calculator
Tap drill size is the pilot hole diameter before you cut internal threads with a tap.
Open toolTapping Workflow
Work through a tapping decision from thread designation to tap-drill data, hole preparation, tap type, and verification status.
Open toolThread Pitch to TPI Converter
Thread pitch in millimeters and TPI both describe axial spacing, but use different units.
Open toolRelated resources
Pair these tools with BoltLab's Reference Library, Standards Library, and Thread Atlas for engineering context, or the Sizes and Charts hubs for quick lookups.