Drills and reamers - Specification for twist drills Ingestion-build-83346 Note: The publications referred to

Note: The publications referred to in BS 3424-26 are listed on the inside back page

Ceramic materials based on high purity alumina

selection and installation of vents to safeguard the structural integrity of enclosures protected by fixed gaseous extinguishing systems and the post discharge venting provisions where used

BS EN 12163 on copper and copper alloys is relevant to:

12 Moisture and dust resistance

Drills and reamers - Specification for twist drills Ingestion-build-83346 Note: The publications referred to1 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