Threading Taps

Threading taps are used to create threads for bolts in materials like metals and plastics. Most commonly used in engineering and manufacturing, threading taps work similar to a drill but due to the unique shape of a tap, when screwed into a piece of material screw threads are created. Threading taps must be used in a predrilled hole and cannot be used for drilling entire holes.

Types of Threading Taps

Most commonly classified by three types, taps can be used in different ways for different applications.
•Taper taps, sometimes called starter taps, are used to initially start a new thread with the first 7-10 threads having a flatter profile than those further up the shaft.


•Plug taps are similar to taper taps but unlike a taper tap, plug taps only have 3-5 starting rows ground down leaving more shaft to create a thread.


•Bottom taps are square in profile with no ground down threads and are used after a taper or plug tap has been used. Bottom taps full length cutting shape allow for threads to be cut at the very bottom of a hole for maximum thread length.



Taps come in a range of sizes in both Metric and Imperial dimension and can also have different shank types. Threading taps are used in conjunction with a tap wrench so always consider the maximum side tap your wrench can hold when purchasing.
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Part Details Brand Thread Size Type Pitch Thread Standard Thread Direction Overall Length Material Shank Diameter Shank Type Ring Colour Class of Fit
RS PRO HSS M2.5 Straight Flute, Plug Thread Tap RS Pro M2.5 Straight Flute, Plug 0.45mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M4 Hexagon Drive Tap Thread Tap, 35 mm Length RS Pro M4 Hexagon Drive Tap 0.7mm Metric - 35 mm HSS - Hex - -
EVENTUS HSS M4 Plug Thread Tap, 45 mm Length EVENTUS M4 Plug 0.7mm Metric - 45 mm HSS - Plain - 6H
RS PRO HSS M5 Straight Flute, Taper Thread Tap RS Pro M5 Straight Flute, Taper 0.8mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M4 Straight Flute, Second Thread Tap RS Pro M4 Straight Flute, Second 0.7mm Metric Coarse - - HSS - Plain - -
Dormer HSS M4 Straight Flute, Taper Thread Tap, 53 mm Length
  • RS Stock No. 240-3164
  • Brand Dormer
  • Mfr. Part No. E500 4.0 X 0.70 3FL TPR
Dormer M4 Straight Flute, Taper 0.7mm Metric Right Hand 53 mm HSS 4 mm Plain - 6H
RS PRO HSS M6 Straight Flute, Second Thread Tap RS Pro M6 Straight Flute, Second 1mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M2 Straight Flute, Plug Thread Tap RS Pro M2 Straight Flute, Plug 0.4mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M6 Spiral Flute, Second Thread Tap RS Pro M6 Spiral Flute, Second 1mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M6 Straight Flute Thread Tap, 66 mm Length RS Pro M6 Straight Flute 1mm Metric Left Hand 66 mm HSS 6.3 mm Plain - -
RS PRO HSS 3/8-16 Straight Flute Thread Tap, 70 mm Length RS Pro 3/8-16 Straight Flute - UNC - 70 mm HSS 7 mm Plain - -
Dormer HSS M6 Straight Flute, Plug Thread Tap, 66 mm Length
  • RS Stock No. 240-3259
  • Brand Dormer
  • Mfr. Part No. E500 6.0 X 1.00 3FL BOTT
Dormer M6 Straight Flute, Plug 1mm Metric Right Hand 66 mm HSS 6.3 mm Plain - 6H
RS PRO HSS M5 Spiral Point Thread Tap, 58 mm Length RS Pro M5 Spiral Point 0.8mm Metric - 58 mm HSS 5 mm Plain - -
RS PRO HSS M2 Spiral Flute, Second Thread Tap RS Pro M2 Spiral Flute, Second 0.4mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M4 Straight Flute, Taper Thread Tap RS Pro M4 Straight Flute, Taper 0.7mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M3 Straight Flute, Second Thread Tap RS Pro M3 Straight Flute, Second 0.5mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M2 Straight Flute, Taper Thread Tap RS Pro M2 Straight Flute, Taper 0.4mm Metric Coarse - - HSS - Plain - -
RS PRO HSS #6-32 Spiral Point Thread Tap, 50 mm Length RS Pro #6-32 Spiral Point - UNC - 50 mm HSS 3.55 mm Plain - -
RS PRO HSS M3 Straight Flute, Plug Thread Tap RS Pro M3 Straight Flute, Plug 0.5mm Metric Coarse - - HSS - Plain - -
RS PRO HSS M3 Hexagon Drive Tap Thread Tap, 32.5 mm Length RS Pro M3 Hexagon Drive Tap 0.5mm Metric - 32.5 mm HSS - Hex - -
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