TAP 1/2" UNF TAPER HSS
TAP-1/2T-UNF
Imperial Taps
Description
Product Code : TAP-1/2T-UNF
Description: 1/2" UNF Taper Tap
Number Pieces : 1
Brand :Totem
Specs :
Surface Finish: Bright
Material: HSS - Ground Thread
Flute Type: Straight
Diameter: 1/2"
TPI: 20
Overall Length: 84mm
Tapping Drill: 11.50mm
Type: Taper
Notes :
UNF (Unified National Fine)
This thread form was introduced in 1948 as an attempt to standardise thread forms in the USA, Canada, and the UK. The thread profile of UNF is the same as for metric threads and is described in the JIS B0206 standard. The thread is described by its major diameter and the number of threads per inch of length (TPI) When used on external threads this series has greater tensile stress area than coarse load threads of the same size. Fine series threads will resist stripping out better than coarse threads in areas where the external and mating internal threads are subject to equal loads or greater than the capacity of the screw or the bolt. Fine threads are also used where the length of engagement is limited or where wall thickness demands a fine pitch.
Taper Taps - have a lead up of up to eight threads and are used as a starting tap in difficult or high precision holes.
Intermediate Taps - have a lead up of about four threads and are used in most general purpose applications to cut a thread true for a pre-drilled pilot hole.
Bottoming Taps - have a lead up of about two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole. Bottoming taps are typically preceded by the use of a Taper or Intermediate tap.
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