Page 31 - THREADING CATALOG

USER GUIDE
THREAD TURNING

Anvil Selection for Symmetric Threading Profiles
The table below defines the recommended insert inclination angle (β) and anvil selection according to
the helix angle (φ) for single-start threading and the lead angle (φ L) for multi-start threading, depending
on the threading turning method for machining the following symmetric threading profiles:
• Partial profile threading with angle profile of 60°, 55° only.
• Full profile threading according to ISO, UN, Whitworth, NPT, BSPT, Trapeze, ACME, RD standards only.
Thread Turning Method
production of right-hand threading production of left-hand threading
with right-hand holder with left-hand holder
LH

RH or LH

RH

Anvil Selection
Positive Anvils
Threading helix (lead) angle φ (φ L) φ (φ L)≥ 5º 4º≤φ (φ L)<5º 3º<φ (φ L)≤4º 2º<φ (φ L)≤3º 1º<φ (φ L)≤2º 0º<φ (φ L)≤1º
Inclination Angle β 4.5º 3.5º 2.5º 1.5º (std) 0.5º
IC Toolholder Anvil Designation
16 EX RH OR IN LH AE 16+4.5 AE 16+3.5 AE 16+2.5 * AE 16+1.5 AE 16+0.5
(3/8) EX RH OR IN LH AI 16+4.5 AI 16-3.5 AI 16+2.5 * AI 16+1.5 AI 16+0.5
22 EX RH OR IN LH AE 22+4.5 AE 22+3.5 AE 22+2.5 * AE 22+1.5 AE 22+0.5
(1/2) EX RH OR IN LH AI 22+4.5 AI 22+3.5 AI 22+2.5 * AI 22+1.5 AI 22+0.5
27 EX RH OR IN LH special AE 27-4.5 AE 27+3.5 AE 27+2.5 * AE 27+1.5 AE 27+0.5
(5/8) EX RH OR IN LH solution AI 27+4.5 AI 27+3.5 AI 27+2.5 * AI 27+1.5 AI 27+0.5
22U EX RH OR IN LH AE 22U+4.5 AE 22U+3.5 AE 22U+2.5 * AE 22U+1.5 AE 22U+0.5
(1/2U) EX RH OR IN LH AI 22U+4.5 AI 22U+3.5 AI 22U+2.5 * AI 22U+1.5 AI 22U+0.5
27U EX RH OR IN LH AE 27U+4.5 AE 27U+3.5 AE 27U+2.5 * AE 27U+1.5 AE 27U+0.5
(5/8U) EX RH OR IN LH AI 27U+4.5 AI 27U+3.5 AI 27U+2.5 * AI 27U+1.5 AI 27U+0.5
* Standard anvil supplied with tool
Positive Anvils

Feed Towards the Chuck

+φ (φ L)
+β

1.5°
const.

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