Quality Hand Taps, UNF, HSS, 3rd/ Bottom.
UNF, HSS, Intermediate, Lead Hand, 2nd Tap, ISO 529/ BS 949.
Fixaball.co.uk sells all hand tap, thread types at the best internet prices, with free delivery.
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5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4", 7/8",
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.
Taper tap, also known as, 'starter taps' or ,'1st taps', have a longer/ larger champfered end to ease the forming tool through the pre drilled hole. The taper is so to ease a tap better into an untapped hole. eg. Using a bottoming tap 1st would damage the first threads and possibly the thread at the start of the hole
2nd taps are intermediate taps which assist in aligning and starting of the tap into an untapped hole. The number of tapered threads typically ranges from 3 to 5.
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.
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.
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