Description
UNF, HSS, 3rd/ Bottom, Quality Right Machine/ Hand Tap, ISO 529/ BS 949
Fixaball sells UNF, 3rd/ Bottom, hand machine taps.
Machine/ Hand Taps
Machine/ Hand Taps are used to create a thread in a pre-drilled hole so that a fastener with the same size/ type of thread can be screwed into it to secure a component/ part. They should be used with a suitable lubricant for better quality threads and to prolong the life of the tap.
Orders placed before 2pm are dispatched same day (Mon-Fri).
Standard, Free Delivery is Royal Mail, 2nd Class (2-5 days, most likely 2 days). For a faster delivery time, select 1st class or courier at checkout.
Please choose your size and quantity from the drop down menus.
UNF, 3rd/ Bottom, Quality Machine/ Hand Tap Sizes Available
- 5/16″,
- 3/8″,
- 7/16″,
- 1/2″
Bottoming Taps
A bottoming, or, ‘plug’, tap has no tapered, front edge. Instead it’s tip is ground to a cutting edge meaning that it can create a thread to the bottom of a blind hole.
THREAD
UNIFIED THREAD STANDARDS
The basic American standards for fastening screw threads as agreed upon by standard bodies of Canada, the United Kingdom, and the United States. They are a complete and integrated system of threads for fastening purposes. Their outstanding characteristic is general interchangeability of threads achieved through the standardization of thread form, diameter-pitch combinations, and limits of size
Unified National Coarse (UNC) is a thread form with a 60 degree flank angle rounded roots and flat crests. For a given diameter it has a larger thread pitch than an equivalent diameter UNF thread. The unified thread is based on inch sizes and was first standardised in 1948 unifying the Whitworth and American standard thread forms
Unified National Extra Fine (UNEF) is a Unified thread form with a very fine (small) pitch that are typically used on instruments and parts requiring a fine adjustment.
Unified National Fine (UNF)is a thread form with a 60 degree flank angle rounded roots and flat crests. For a given diameter it has a smaller thread pitch than an equivalent diameter UNC thread.
Unified National (UN)thread form with a rounded root contour, applies only to external threads. (The UN thread form has a flat, or optionally, a rounded root contour.) The majority of fasteners with a Unified thread form (UNC UNF) have a rounded root contour i.e. are UNR threads.
Image is for illustrative purposes only.
