Общий каталог Widia 2017 - страница 608

TopThread

Insert Identifi cation System

NDC38RDR75

N — TopThread™ B — Buttress Indicates API or R — Right Hand

drilling industry form designation

F — Fine pitch (e.g., 10RD, L — Left Hand

8RD, .038)

S — Stub Acme or

controlled root radius threading

C — Cresting inserts indicate the

root radius in 0,025 increments (NJ, P — Positive rake NJF, NJP, NJK) or

K — Fine pitch, positive M indicates metric

ISO thread

A — Acme

D — API or NPT

J — UNJ thread

T — 60° V thread

W — 55° V Whitworth

T

TopThread insert dimensions

A T

NJF NDC-V-M NTC

• Threads per inch or pitch (for metric)
• “A” or “B” type Buttress insert
• Taper per foot — API threads

I — Internal thread

E — External thread (used only if internal and external thread forms are different) M — Multiple tooth

K — Standard chip control

C — Coarse pitch

D — Dryseal

NA NT NT-K