Specification for the tapping of holes to receive wire thread inserts (UNC and UNF threads) Diameters ¼ in and over

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

16-08-1961

Publisher

British Standards Institution

Co-operating organizations
Foreword
1 Scope
Section 1 - Tapped holes
2 Form of thread and limits of size
3 Identification
Section 2 - Screwing taps
4 General dimensions
5 Marking
6 Form of thread
7 Limits of size for cutting diameter
Section 3 - Gauging system
8 General
9 Design and general dimensions
10 Tolerances and limits of size

Specifies limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from ¼ in to 1½ in UNC inclusive and from ¼ in to 1 in UNF inclusive. It includes recommendations for general dimensions and limits of size on the threaded portion of screwing taps intended to produce holes to the limits specified, together with details of a recommended gauging system for checking them.

This British Standard comprises three sections:

Section 1, which specifies limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from 1/4 in to 11/2 in UNC inclusive and from 1/4 in to 1 in UNF inclusive;

Section 2, which recommends screwing taps intended to produce holes to the limits of size specified in Section 1;

Section 3, which gives a recommended gauging system for checking the tapped holes.

Committee	FME/9
DevelopmentNote	Reviewed and confirmed by BSI, March 2013. (03/2013)
DocumentType	Standard
Pages	20
PublisherName	British Standards Institution
Status	Current

DEFSTAN 02-862(PT1)/2(2007) : 2007	FASTENERS - PART 1: GENERAL
DEFSTAN 02-862(PT1)/3(2011) : 2011	NAVAL FASTENERS - PART 1: MATERIAL SELECTION AND USE

BS 949(1969) : LATEST

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BS 3409-1:1961

Specification for the tapping of holes to receive wire thread inserts (UNC and UNF threads) Diameters ¼ in and over

Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

Standards Referencing This Book

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