UNIFIED NATIONAL COARSE TAPS | UNC BORDO

UNC | UNIFIED NATIONAL COARSE TAPS

About this item:

These Chrome Alloy Unified National Coarse (UNC) taps are precision-engineered hand tools designed for threading applications in a variety of materials. Available in bottoming, intermediate, and taper lead styles, they are ideal for creating or restoring female threads in non-ferrous metals and plastics.

• Material & Finish: Crafted from durable chrome alloy, these taps offer reliable performance for general-purpose threading tasks. Note that they are not suitable for precision, safety-critical, or high-accuracy thread creation.
• Thread Standard: Featuring the UNC thread form introduced in 1948 to standardize threading across the USA, Canada, and the UK, these taps conform to the JIS B0206 standard. The thread profile matches metric thread geometry, with specifications described by major diameter and threads per inch (TPI).
• Applications: Commonly used in mass production of bolts, screws, and nuts, UNC taps excel when threading into lower tensile strength materials such as bronze, brass, aluminium, and plastics. Their coarse thread pitch provides excellent resistance to stripping and is well suited for quick assembly or disassembly, especially where corrosion or minor thread damage may occur.
• Lead Types:
  • Bottoming taps have a lead of two threads, enabling minimal thread run-out when tapping to the bottom of blind holes. They are typically used after starting with taper or intermediate taps.
  • Intermediate taps feature a lead of four threads and are suited for most general-purpose threading, cutting threads true to a pre-drilled pilot hole.
  • Taper taps possess a lead of eight threads, making them ideal as starting taps for difficult or high-precision holes.

Each tap is designed to ensure efficient thread chasing for cleaning existing threads or creating new female threads with consistent quality. Their robust construction and adherence to recognized thread standards make them a dependable choice for both professional and hobbyist machinists.