Practical machining
Drilling and Tapping Guides
These guides explain a careful workflow without inventing hands-on testing or universal cutting parameters. Tool and machine manufacturers remain the authority for specific operating instructions.
Reference library
Focused pages with a clear owner
Each URL answers a distinct question. ThreadSizeGuide avoids automatically generating thin pages for every possible size.
How to Drill and Tap a Hole
A careful step-by-step workflow for drilling and tapping a straight internal thread while controlling alignment, chips and verification.
Read reference →Practical guideHow to Choose a Tap Drill Size
Choose a tap drill by thread, tap process, material and engagement target instead of relying on one generic formula.
Read reference →Practical guideHow to Measure and Identify a Thread
Identify an unknown straight thread using diameter, pitch, profile clues and authoritative references without forcing a near match.
Read reference →TroubleshootingHow to Reduce the Risk of Breaking a Tap
Diagnose tap breakage risk by checking hole size, alignment, chip control, lubrication, tool condition and setup rigidity.
Read reference →Process selectionCut Taps vs Forming Taps
Compare how cutting and forming taps create threads, why their drill sizes differ and when manufacturer-specific guidance is essential.
Read reference →Inspection guideHow to Use a Thread Pitch Gauge
Use inch and metric pitch-gauge leaves to identify candidate pitches while avoiding false matches and damaged threads.
Read reference →Tool selectionDrill Bit Materials: HSS, Cobalt and Carbide
Compare common drill tool materials without treating the label as a substitute for geometry, coating, rigidity or cutting data.
Read reference →Tool selectionChoosing a Tap for the Work Material
Choose cutting or forming taps by material behavior, hole type, chip direction, lubrication and manufacturer application data.
Read reference →Material guideTapping Aluminum
Plan an aluminum tapping process around alloy, chip behavior, built-up edge, lubrication, alignment and hole control.
Read reference →Material guideTapping Steel
Plan steel tapping around grade, hardness, work hardening, chip control, lubrication and rising-torque warning signs.
Read reference →Hole planningBlind-Hole vs Through-Hole Tapping
Plan chip flow, drill depth, tap lead and usable thread depth differently for blind and through holes.
Read reference →Tap geometryTap Types, Flutes and Chamfers
Understand how hand, spiral-point, spiral-flute and forming taps differ, and how chamfer length affects starting and full-thread depth.
Read reference →Process controlHow Drill Runout Affects Hole Size
Understand why nominal drill diameter does not guarantee the produced hole and how holder, spindle and setup errors accumulate.
Read reference →