BS 1157:1975

Recommendations for tapping drill sizes for use with fluted taps

BSI Group , 09/30/1975

$132.00 $264.16

Sizes for ISO internal metric threads to BS 3643 (Parts 1, 2 and 3) and for internal threads to BS 21, 84, 93, 1580 (Parts 1, 2 and 3) and 2779. Alternative sizes in appendix.Cross References:BS 21BS 84BS 93BS 328:Part 1BS 1580:Parts 1 & 2BS 1580:Part 3BS 2779BS 3643:Part 2BS 3643:Part 3