1 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.