HSS Machine & Fractional Hand Taps
HSS Machine Screw and Fractional Hand Taps
Shop high-speed steel machine screw and fractional hand taps for cutting internal inch threads in metal. These taps are used for general-purpose fastening, fabrication, machinery maintenance, and thread repair.
Choose from common UNC coarse and UNF fine thread sizes, along with special-size options. Our selection includes Qualtech and Tap America hand taps for a variety of threading applications.
Need the matching drill bit? Browse our Hand Tap and Drill Sets, or use the Tap and Drill Chart to select your drill separately.
Machine Screw, Fractional, UNC and UNF Threads
Machine Screw Sizes
Machine screw taps are used for smaller numbered thread sizes commonly found in equipment, assemblies, and precision components.
Fractional Sizes
Fractional taps cover inch-based diameters such as 1/4", 5/16", 3/8", and larger sizes.
UNC and UNF
UNC threads have a coarser pitch, while UNF threads have a finer pitch at the same nominal diameter. Match the exact thread specification before ordering.
Choosing Your Tap and Drill Size
Confirm the thread diameter, threads per inch, and required chamfer style before selecting your tap. Plug taps are commonly used for general-purpose threading, taper taps help start threads, and bottoming taps cut closer to the bottom of blind holes.
Use our Tap and Drill Chart for common sizes or the Special Tap and Drill Size Calculator for uncommon inch thread combinations.
For additional threading information, visit our Hand Taps Guide.