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2.3.1 Laydown Inserts for External and Internal Threading

Laydown inserts belong to the ISCAR threading family. The geometry (length and IC) of
these inserts is designed according to ISO Standard, and laydown insert can be used for
internal and external threading.
The cutting edge profile of laydown inserts can be adjusted to most threading sizes of THREAD TURNING
different threading standards. ISCAR classifies laydown inserts into 3 types: B-Type, M-Type,
and G type. There are 2 configurations: U-Type and Regular type. The inserts are available
with one tooth on each cutting edge or with a number of teeth on each cutting edge ( multi-
tooth inserts).

Basic Dimensions of Laydown Inserts

U-Type Regular Type Regular Type
PDX
PDX
RE PDX RE RE
IC
PDY PDY PDY
INSL INSL INSL

IC
IC
IC — Inscribe circle diameter
PDX — Distance between the insert and the corner radius

PDY — Gap between the corner radius and the theoretical triangular vertex
INSL — Insert length, triangular leg length

RE — Corner radius

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