
④ Hand Tap Series Overall
length
L
Thread
length
ℓ
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)
①
JIS Hand Taps for Cast Irons
Spiral Fluted Taps
(for through hole)
②
Specification
<2D
Spiral Pointed Taps
(for through hole)
Nitride
③
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 )
④
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
⑤
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
⑥
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
⑦
Comparison of accuracy between HT and FC-HT
Pipe Taps
⑧
0
Thread Mills
Premium Thread Mills
⑨
0
Dies
⑩
Center Drills
Centering Tools
⑪
JIS
④-91