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Technical Information
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60° V-Thread Crest Turning Application Data
feed direction
60° V-Thread Crest Turning Application Data
insert
catalogue number nose radius
on insert
(mm) NJ-3014R/L12 0,317/0,342 0,317/0,381
NJK-3008R/L20 0,190/0,215 0,190/0,0228
thread radius per
MIL-S-8879A
(mm)
feed direction
“J” thread note for catalogue
NTC crest turning insert
for (P ) 2mm) and fi ner.
The controlled root radius thread form (SAE8879C) is defi ned for the external
thread only. To machine the corresponding internal thread, choose any insert
that will cut a unifi ed class 2B thread, then bore the minor diameter to size.
Refer to SAE8879C and MIL-S-8879C and SAEAS8879D for the correct “J”
thread minor diameter values.
NTC crest turning insert
for (P * 3mm) and coarser.
NOTE: NTC inserts automatically control root to crest dimensions.
Therefore, in setting up threading operations with NTC inserts,
check the O.D. or I.D. at the thread crest for correct dimensions.
60° V-Thread Application Data
recommended TPI*
insert
description
radius
feed direction
recommended TP*
insert D
(mm) E
(mm) external internal external internal
NT-1 1,90 1,11 – 24–12 – 1,00–2,00
NT-2 28,70 1,90 36–8 20–7 0,70–3,00 1,25–3,50
NT-2-K 28,70 1,90 36–8 20–7 0,70–3,00 1,25–3,50
NTF-2 15,75 1,01 44–14 24–12 0,60–1,75 1,00–2,00
NTK-2 15,75 1,01 44–14 24–12 0,60–1,75 1,00–2,00
NTP-2 28,70 1,90 36–8 20–7 0,70–3,0 1,25–3,50
NT-3 37,59 2,46 20–6 12–5 1,25–4,00 2,00–5,00
NT-3-K 37,59 2,46 20–6 12–5 1,25–4,00 2,00–5,00
NT-3-C 37,59 2,46 11–6 6 (only) 2,50–4,00 4,00 (only)
NT-3-CK 37,59 2,46 11–6 6 (only) 2,50–4,00 4,00 (only)
NTF-3 21,08 1,37 44–10 24–9 0,60–2,50 1,00–2,50
NTK-3 21,08 1,37 44–10 24–9 0,60–2,50 1,00–2,50
NTP-3 37,59 2,46 20–6 12–5 1,25–4,00 2,00–5,00
NT-4 49,78 3,22 20–4 12–4 1,25–6,25 2,00–6,25
NT-4-K 49,78 3,22 20–4 12–4 1,25–6,25 2,00–6,25
NT-4-C 49,78 3,22 11–4 1/2 6–4 1/2 2,50–5,50 4,00–5,50
NT-4-CK 49,78 3,22 11–4 1/2 6–4 1/2 2,50–5,50 4,00–5,50
NTF-4 21,08 1,37 44–10 24–9 0,60–2,50 1,00–2,50
NTK-4 21,08 1,37 44–10 24–9 0,60–2,50 1,00–2,50
NTP-4 49,78 3,22 20–4 12–4 1,25–6,25 2,00–6,25
feed direction
*Based on maximum insert radius size and class 2A and 2B thread specifi cations.
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radius