Table of Contents

1 -  AS/ NZS 2438.1:1994 DRILLS AND REAMERS - SPECIFICATION FOR TWIST DRILLS
4 -  PREFACE
5 -  CONTENTS
6 -  1 Scope
6 -  2 References
6 -  2.1 Normative references
6 -  2.2 Informative references
6 -  3 Definitions
6 -  3.1 Types of twist drill
6 -  3.1.1 parallel shank jobber series twist drill
6 -  3.1.2 parallel shank stub series twist drill
6 -  3.1.3 parallel shank long series twist drill
6 -  3.1.4 parallel shank extra long series twist drill
6 -  3.1.5 Morse taper shank twist drill
6 -  3.1.6 Morse taper shank extra long twist drill
6 -  3.2 Other terms
6 -  3.2.1 axis
6 -  3.2.2 back taper (longitudinal clearance)
6 -  3.2.3 body
6 -  3.2.4 body clearance
6 -  3.2.5 body clearance diameter
6 -  3.2.6 chisel edge
6 -  3.2.7 chisel edge angle
7 -  3.2.8 chisel edge corner
7 -  3.2.9 depth of body clearance
7 -  3.2.10 diameter,
7 -  3.2.11 face
7 -  3.2.12 flank
7 -  3.2.13 flutes
7 -  3.2.14 flute length,
7 -  3.2.15 heel
7 -  3.2.16 helix angle
7 -  3.2.17 lands
7 -  3.2.18 land width
7 -  3.2.19 lead of helix
7 -  3.2.20 left-hand cutting drill
7 -  3.2.21 lip (cutting edge)
7 -  3.2.22 lip clearance angle
8 -  3.2.23 lip length
8 -  3.2.24 outer corner
8 -  3.2.25 overall length,
8 -  3.2.26 point
8 -  3.2.27 point angle
8 -  3.2.28 quick helix angle
8 -  3.2.29 rake angle
8 -  3.2.30 relative lip height
8 -  3.2.31 right-hand cutting drill
8 -  3.2.32 shank
8 -  3.2.33 slow helix angle
8 -  3.2.34 web
9 -  3.2.35 web taper
9 -  3.2.36 web thickness
9 -  4 Dimensions
9 -  5 Features of design
9 -  5.1 General
9 -  5.2 Cutting diameter
9 -  5.3 Back taper
9 -  5.4 Parallel shank
9 -  5.5 Taper shank
9 -  5.6 Lengths
9 -  5.7 Web thickness
9 -  5.8 Web centrality
9 -  5.9 Flute divide
11 -  5.10 Land width
11 -  5.11 Point angle
11 -  5.12 Relative lip height
11 -  5.13 Radial runout
12 -  6 Materials and hardness
12 -  6.1 Cutting portion
12 -  6.2 Shank
12 -  7 Marking
13 -  8 Performance
36 -  Annex A - Method of Test (normative)
36 -  A.1 Test billet

Abstract

Specifies dimensions and tolerances for parallel shank, jobber, stub, long and extra long series of twist drills, and for Morse taper shank and Morse taper shank extra long drills. Tables summarize both imperial and metric sizes for each type of drill. Identical with and reproduced from BS 328.1:1993.

Scope

This Part of BS 328 specifies requirements for the dimensions, design, materials, hardness values and performance for twist drills made of high-speed steel with either parallel or Morse taper shanks.
A method of test for the drills specified is given in annex A.
NOTE. The requirements in this standard may also form the basis for the specification of special purpose twist drills as agreed between the buyer and supplier.
This British Standard is not applicable to woodworking or do-it-yourself (D.I.Y) drills. Its use is for drills manufactured for general engineering applications.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	ME-010
Supersedes	AS 2438-1981