Century Drill Tool 95412 1/2-20 Tap 29/64 Inch Drill Bit Combo

Product Description

The CENTURY DRILL TOOL CO INC 95412 is a two-piece tap and drill bit combo designed for hand cutting applications requiring precise thread formation. The set pairs a 1/2-20 National Fine fractional tap with a 29/64-inch fractional drill bit, giving the installer both the clearance drill and the threading tool in a single package. The tap features precision-cut threads accurately formed for consistent, exact threading. Heat treatment and tempering produce file-hard threads, extending useful service life in repetitive hand-tapping work.

This combo pack is suited for trade professionals and skilled tradespeople who need to cut clean 1/2-20 National Fine threads into metal or other materials during installation, repair, or fabrication tasks. The 29/64-inch drill bit is the standard tap drill size for a 1/2-20 thread, making this a ready-to-use pairing without additional sizing calculations. Typical applications include threading fastener holes in HVAC brackets, plumbing fixtures, electrical enclosures, and general mechanical assemblies where a 1/2-20 NF thread specification is called out.

Key Features

• 1/2-20 National Fine fractional tap for precise hand-cut threads
• Matched 29/64-inch fractional drill bit included — correct tap drill size for 1/2-20 NF
• Precision-formed thread profile for consistent, exact threading results
• Heat treated and tempered for file-hard threads and extended tool life
• Two-piece combo pack — tap and drill bit sold together as one unit
• Designed for hand cutting applications

Compatibility

Designed for hand tapping 1/2-20 National Fine threaded holes across a wide range of metals and materials where a 29/64-inch pilot hole is required prior to threading.

Installation Notes

A licensed or journeyman-level mechanic or tradesperson should select the proper cutting fluid for the base material before beginning hand-tapping operations. Drill the pilot hole with the included 29/64-inch bit before threading with the tap, and ensure the work piece is securely clamped. Apply steady, even pressure and reverse the tap periodically to break chips and prevent binding. Do not force the tap if resistance increases sharply, as breakage in the hole can be difficult to recover from.