④ Hand Tap Series Overall
length
L
Thread
length

Thread + Neck

ℓn
length
Shank
length
ℓs
Shank
dia.
Ds
Size of
square
K
Length of
square
ℓk
JIS
FC-HT
Spiral Fluted Taps
(for blind hole)



JIS Hand Taps for Cast Irons
Spiral Fluted Taps
(for through hole)



Specification
<2D
Spiral Pointed Taps
(for through hole)


Nitride



Recommended Tapping Speeds depending on Materials
Cast irons Ductile cast irons
鋳鉄 強靱鋳鉄

5 10〜
5 10 〜
Hand Taps


( m / min ) ( m / min )



Product Features
●The FC-HT is suitable for thread processing of hard and brittle materials such as cast iron. It is produced
slightly oversized because wear is relatively fast in these materials.
Cemented
Carbide Taps



Tapping Data Comparison of number of holes tapped.
Tapping Conditions [M8×1.25]
Workpiece Material FC25
FC-HT
Roll Taps


Bored Hole Size φ6.8



Can Continue
Tapping Length 12mm
Competitors HT
Tapping Speed 6.5m/min
Machinery Type Special machine
0 500 1,000 1,500 2,000 2,500 3,000
Tapping Fluid Water soluble cutting fluid
(Number of holes processed.)
Special Thread Taps
Simple Inspection Tools



Comparison of accuracy between HT and FC-HT
Pipe Taps



0
Thread Mills
Premium Thread Mills



0
Dies

Center Drills
Centering Tools



JIS
④-91