Cycles Specification for screw threads used in bottom bracket assemblies

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

30-11-1990

Publisher

British Standards Institution

Committees responsible
National foreword
Specification
   Introduction
1 Scope
2 Normative references
3 Basic ISO thread profile and basic sizes
4 Limits and tolerances
5 Designation
6 Gauging system
Tables
1 Basic dimensions
2 Limits and tolerances for screw threads on cups
3 Limits and tolerances for screw threads on bottom
   bracket shell
4 Cup - Limits of size for GO screw ring and calliper
   gauges, and associated screw check, wear and setting
   plugs
5 Cup - Limits of size for NOT GO screw ring and
   calliper gauges, and associated screw check, wear and
   setting plugs
6 Shell - Limits of size for GO and NOT GO screw plug
   gauges
7 Cup and shell - Limits of size for GO and NOT GO
   plain ring or calliper gauges for cup major diameter,
   and GO and NOT GO plain plug gauges for shell minor
   diameter
Figures
1 Basic profiles of British Standard Cycle and ISO
   threads
2 Thread profiles and tolerance zones for ISO bottom
   bracket shell and cup threads

Specifies the thread profile and limits and tolerances for the screw threads used to assemble bottom cups to bottom brackets on bicycles (adjustable cups with right hand thread, fixed cups with left hand thread).

This International Standard specifies the thread profile and limits and tolerances for the screw threads used to assemble bottom bracket cups to bottom brackets on bicycles (adjustable cups with right-hand thread, fixed cups with left-hand thread). It is based on

the use of the ISO basic thread profile given in ISO 68;
satisfactory interchangeability with the corresponding British Standard Cycle (B.S.C.) thread; this has required the use of an inch pitch (t.p.i.);
the use of screw thread tolerance grades and tolerance positions given in ISO 965-1;
the use of gauges made to ISO 1502.

Committee	GME/25
DevelopmentNote	Also numbered as ISO 6696 Supersedes 89/70615 DC (09/2005) Reviewed and confirmed by BSI, September 2013. (08/2013)
DocumentType	Standard
Pages	12
PublisherName	British Standards Institution
Status	Current

BS 3643-1:1981	ISO metric screw threads Principles and basic data
BS 919-3:1968	Specification for screw gauge limits and tolerances Gauges for ISO metric screw threads

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BS 6102-9:1990

Current

Table of Contents

Abstract

Scope

General Product Information

Standards Referencing This Book

Category

Subcategory

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