ISO 2306:1972 PDF

Name: ISO 2306:1972 — Drills for use prior to tapping screw threads
SKU: ISO 2306:1972
Price: 25 EUR
Availability: InStock

Drills for use prior to tapping screw threads

Название (английский):

ISO 2306:1972

Drills for use prior to tapping screw threads

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 июля 1972 г.
Издание:: ISO IS 2306 edition 1 version 1
ICS:: 25.100.30

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Описание (английский):

Specifies the sizes of these drills for ISO metric threads (tables 1 and 2). ISO inch threads (tables 3 and 4) and pipe threads (tables 5 and 6). Applies to screw threads of normal length of engagement, the drill diamter being approximately equal to the nominal diameter of the thread minus the pitch. The sizes (except for those sizes indicated by an asterisk) have been selected from ISO 235 and are to be used in the future.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 2306:1972 - "Drills for use prior to tapping screw threads" is an ISO standard that specifies recommended drill sizes to use before tapping parallel screw threads. It covers drill diameters for ISO metric threads (coarse and fine series), ISO inch threads (UNC and UNF), and pipe threads. Drill diameter is defined approximately as the nominal thread diameter minus the thread pitch. The standard provides tables of drill sizes (Tables 1–6) and an annex summary (Table 7) to guide tap drill selection for normal lengths of engagement.

Key topics and technical requirements

Scope: Drill sizes for pre-tapping holes for metric threads, inch (UN) threads and pipe threads; intended for threads of normal engagement length.

Drill diameter rule: Recommended drill diameter ≈ nominal thread diameter − pitch.

Tabulated data: Detailed tables for:

ISO metric coarse and fine pitch series (Tables 1 & 2)
Unified coarse (UNC) and unified fine (UNF) inch threads (Tables 3 & 4)
Pipe threads with and without pressure-tight joints (Tables 5 & 6)
Annex summary of drill diameters across common metric pitches (Table 7)

Class of fit: Minor diameters and drill recommendations reference common class tolerances (e.g., 5H, 6H, 7H) so users can match drill choice to thread tolerance.

Selection notes: The standard explains practical influences on drilled hole size - drill point geometry, work material, lubricant, alignment, feed and speed - and notes that softer materials may deform, reducing the effective tapped minor diameter.

Standardization of sizes: Most drill sizes are selected from ISO/R 235 (jobber/stub and Morse taper drills); a small number are exceptions indicated in the document.

Applications and users

ISO 2306 is practical for:

Machinists and CNC programmers selecting tap drill sizes for production and prototyping

Tooling and manufacturing engineers specifying hole sizes for threaded components

Toolroom and maintenance departments stocking drill inventory and preparing tapping operations

Quality engineers verifying correct pre-tap hole diameters to reduce tap wear and breakage

Technical educators and documentation authors creating manufacturing process documents or drilling/tapping charts

Benefits include reduced tap breakage, improved tapping economy, consistent thread quality, and standardized drill inventory.

Related standards

ISO/R 235 - Parallel shank twist drills (jobber and stub series)

ISO/R 261 - Metric screw threads - general plan

ISO/R 263 - Inch screw threads - general plan

ISO/R 7 and ISO/R 220 - Pipe thread specifications (pressure-tight and non-pressure-tight)

Keywords: ISO 2306, tap drill sizes, tapping drill chart, ISO metric threads, UNC, UNF, pipe threads, drill diameter, tap drill selection.

ISO 2306:1972 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

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