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BSI
BS 328-2:1972

BS 328-2:1972

Current

Current

The latest, up-to-date edition.

Drills and reamers Combined drills and countersinks (centre drills)

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

28-07-1972

Publisher

British Standards Institution

Cooperating organizations
Foreword
Specification
1. Scope
2. Manufacturing requirements for combined drills
    and countersinks (centre drills)
3. Dimensions of combined drills and countersinks
    (centre drills)
4. Designation
5. Combined drills and countersinks (centre drills)
    for centre holes without protecting chamfer. Type A
6. Combined drills and countersinks (centre drills)
    for centre holes with protecting chamfer. Type B
7. Combined drills and countersinks (centre drills)
    for centre holes with radius form. Type R
Appendices
A. Recommended dimensions for centre holes. Type A
B. Recommended dimensions for centre holes. Type B
C. Recommended dimensions for centre holes. Type R
Tables
1. Dimensions of combined drills and countersinks
    (centre drills). Type A
2. Dimensions of combined drills and countersinks
    (centre drills). Type B
3. Dimensions of combined drills and countersinks
    (centre drills). Type R
4. Dimensions for centre holes. Type A
5. Dimensions for centre holes. Type B
6. Dimensions for centre holes. Type R
Figures
1. Single-ended combined drills and countersinks
    (centre drills). Type A (d < 0.8 mm)
2. Double-ended combined drills and countersinks
    (centre drills). Type A (d > 1 mm)
3. Combined drills and countersinks (centre drills).
    Type B
4. Combined drills and countersinks (centre drills).
    Type R
5. Type A centre hole
6. Type B centre hole
7. Type R centre hole

Designations and dimensions of combined drills and countersinks (centre drills) for centre holes, without protecting chamfers, with protecting chamfers or of radius form.

This Part of this British Standard gives designations and dimensions for the following types of centre drills.

  1. Type A, combined drills and countersinks (centre drills) for centre holes without protecting chamfers.
  2. Type B, combined drills and countersinks (centre drills) for centre holes with protecting chamfers.
  3. Type R, combined drills and countersinks (centre drills) for centre holes with radius form.

Appendix A, Appendix B and Appendix C show the recommended dimensions for centre holes.

Committee
W/-
DevelopmentNote
Supersedes BS 328(1950) (07/2004) Reviewed and confirmed by BSI, December 2009. (11/2009)
DocumentType
Standard
Pages
14
PublisherName
British Standards Institution
Status
Current

Standards Relationship
ISO 2541:2016 Identical
ISO 866:2016 Identical
ISO 2540:2016 Identical

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Hardcopy - English
PDF - English
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