Page 636 - Master Catalog 2017, Inch

TopThread
™
Catalog Numbering System

TopThread ™
Insert Identifi cation System

NDC38RDR75

N D C 3 8RD R 75

Type Insert Additional Insert Industry Thread Hand Defi nition Additional
of Insert Information Size Identifi cation of Insert of Insert Information

N — TopThread ™ B — Buttress Indicates API or R — Right
drilling industry hand
form designation
F — Fine pitch L — Left
(e.g., 10RD,
8RD, .038) hand
or
S — Stub Acme
controlled root
radius threading
C — Cresting inserts indicate
the root radius in
.001" increments
P — Positive rake
(NJ, NJF, NJP,
NJK)
K — Fine pitch, positive or
M indicates
metric ISO thread

• Threads per inch
or pitch (for metric)
T
• “A” or “B” type
Buttress insert
• Taper per foot —
API threads
A — Acme
TopThread insert dimensions
D — API or NPT A T

insert
J — UNJ thread size inch mm inch mm I — Internal thread
1 .100 2,54 .100 2,54
T — 60° V thread E — External thread (used only if
2 .219 5,56 .150 3,81 internal and external thread
3 .344 8,74 .195 4,95 forms are different)
W — 55° V Whitworth
4 .453 11,51 .255 6,48 M — Multiple tooth
5 .688 17,48 .380 9,65
K — Standard chip control
6 .453 11,51 .383 9,73
8 .312 7,93 .438 11,13
C — Coarse pitch
NJF NDC-V-M NTC
D — Dryseal

NA NT NT-K

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