The Independent Scratch Builder

The Independent Scratch Builder

Torque, fasteners, and building from nothing

  1. What Size Drill Bit for 1 4 Tap? 1/4-20 and 1/4-28 Chart For a standard 1/4-20 UNC cutting tap, use a #7 drill. For a standard 1/4-28 UNF cutting tap, use a #3 drill. The two sizes are not interchangeable because the…
  2. 3 8 NPT Hole Size: 9/16 vs 37/64 Drill Guide 3/8-18 NPT tap-drill comparison
  3. 1/2-13 Tap Drill Bit Size: Use a 27/64-Inch Drill Quick answer
  4. How to Use a Riveter Tool: Step-by-Step Guide A dependable blind-riveted joint comes from compatibility and preparation—not merely squeezing until the mandrel pops. The rivet’s published grip range must…
  5. M6 Clearance Hole Size: 6.4, 6.6 or 7.0 mm? By Rowan Blake — garage-shop machine builder Last reviewed: August 8, 2026 Source check: For controlled work, verify dimensions against the engineering drawing…
  6. Mabuchi Motors Vintage Slot Cars: Identification Guide Identifying Mabuchi motors in vintage slot cars is rarely a one-clue exercise. Can color may vary with voltage, reseller, application, or later repainting. A…
  7. 1 1 4 NPT Dimensions: 1-1/4-11.5 Thread Chart The full designation is 1-1/4-11.5 NPT: a nominal 1-1/4-inch pipe size with 11.5 threads per inch. Its principal basic dimensions include a 1.660-inch pipe…
  8. Bolt Torque Basics for Builders: Specs, Sequence & Feel What a torque spec actually controls, standard values for common fastener sizes, tightening sequence, and when hand-feel beats the wrench.