Drillco 5/8-18 HSS Left Hand Bottom Tap (23A140FB)
Drillco 23A140FB 5/8-18 HSS Left Hand Bottom Tap – 2300 Series is designed to cut precise counterclockwise (left-hand) threads in holes, making it suitable for applications where reverse-threaded fasteners are needed to prevent loosening under stress or vibration. The bottoming tap geometry allows threading close to the bottom of blind holes for maximum thread engagement. Crafted from premium-grade high-speed steel (HSS), this tap provides excellent cutting performance and durability. The black oxide finish enhances wear resistance and reduces friction during tapping, extending tool life compared to bright finish taps. Its standard square shank ensures compatibility with most tap wrenches for easy handling and reliable use.
Produces left-hand threads for specialized fastening needs
Bottoming tap design for threading close to the bottom of blind holes
Made from premium-grade high-speed steel (HSS) for durability and precision
Black oxide finish for improved wear resistance and reduced friction
Standard square shank compatible with common tap wrenches
Available in taper, plug, and bottoming geometries for versatile applications
Helps prevent loosening of fasteners in high-stress or vibration-prone environments
Allows threading close to hole bottom for maximum thread length
Durable construction ensures long-lasting performance
Technical Specifications:
Thread Size: 5/8-18
Thread Direction: Left Hand
Tap Type: Bottoming Tap
Material: Premium Grade High-Speed Steel (HSS)
Finish: Black Oxide
Shank Type: Standard Square
Country of Origin: USA
Product identification
- Brand: Drillco
- Model / MPN: 23A140FB
