Laydown Threading
Catalogue Numbering System
Laydown Threading
Insert Identifi cation System
3ERAISO
3 E R A ISO
Insert
Size Insert Type Hand
of Insert Thread
Pitch Thread
Profi le
Number of Teeth
E —
External thread R —
Right-hand
thread Single tooth profi le —
No symbol
I —
Internal thread L —
Left-hand
thread Multi-tooth profi le —
Number of teeth
(cutting edge and symbol)
Multi-tooth profi le with
two teeth — 2M
55 Partial Profi le 55°
60 Partial Profi le 60°
ISO ISO Metric 60°
TR ISO Metric 60°
UN ISO Inch/American UN 60°
W Whitworth 55°
Partial profi le inserts
mm
A 0,5–1,5
AG 0,5–3,0
G 1,7–3,0
N 3,5–5,0
Q 5,5–6,0
NPT American National Pipe Thread 60°
RD Round
PG Steel Conduit
APIRD
API Round
d
Full profi le inserts
L1
F44
symbol d L1 symbol mm
2 0.250 11 Actual
TPI 0,5–0,4
3 0.375 16 4 0.500 22
5 0.625 27
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symbol