Page 33 - THREADING CATALOG

USER GUIDE
THREAD TURNING

Anvil Selection for ABUT Threading Standard Only
The table below defines the recommended insert inclination angle (β) and anvil selection according to helix angle
(φ) for single-start threading and according to lead angle (φ L) for multi-start threading, depending on the threading
turning method for machining asymmetric threading profile according to ABUT threading standard only.
Threading Turning Method
production of right-hand threading production of left-hand threading
with right-hand holder with left-hand holder

LH

or LH
RH
RH

Anvil Selection
Positive Anvils Negative Anvils
Threading helix (lead) angle φ (φ L) φ (φ L)>3.5° 3°<φ (φ L)≤3.5° 2°<φ (φ L)≤3° 1°<φ (φ L)≤2° 0°<φ (φ L)≤1°
Inclination angle β 1.5° (std) 0.5 -0.5° -1.5°
lC Toolholder Anvil designation
16 EX RH OR IN LH * AE 16 +1.5 AE 16 +0.5 AE 16 -0.5 AE 16 -1.5
(3/8) EX LH OR IN RH * AI16 +1.5 AI16 +0.5 AI 16 -0.5 AI 16 -1.5
22 EX RH OR IN LH * AE 22 +1.5 AE 22 +0.5 AE 22 -0.5 AE 22 -1.5
(1/2) EX LH OR IN RH * AI 22 +1.5 AI 22 +0.5 AI 22 -0.5 AI 22 -1.5
27 EX RH OR IN LH * AE 27 +1.5 AE 27 +0.5 AE 27 -0.5 AE 27 -1.5
(5/8) EX LH OR IN RH special solution * AI 27 +1.5 AI 27 +0.5 AI 27 -0.5 AI 27 -1.5
22U EX RH OR IN LH * AE 22U +1.5 AE 22U +0.5 AE 22U -0.5 AE 22U -1.5
(1/2U) EX LH OR IN RH * AI 22U +1.5 AI 22U +0.5 AI 22U -0.5 AI 22U -1.5
27U EX RH OR IN LH * AE 27U +1.5 AE 27U +0.5 AE 27U -0.5 AE 27U -1.5
(5/8U) EX LH OR IN RH * AI 27U +1.5 AI 27U +0.5 AI 27U -0.5 AI 27U -1.5
* Standard anvil supplied with tool
• EX - anvil for external threading
• IN - anvil for internal threading

Positive Anvils Negative Anvils

Feed Towards the Chuck Feed Towards the Tailstock

+φ (φ L) -φ (φ L)
+β −β°

1.5° 1.5°
const. const.

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