This standard BS ISO 2238:2018 Machine bridge reamers is classified in these ICS categories:
25.100.30 Drills, countersinks, reamers
This document specifies the dimensions of machine bridge reamers. It gives, for a series of diameter ranges, d1, from 6 mm to 50,8 mm, the values, in millimetres, for the following dimensions of these tools:
overall length, l3;
total cutting edge length, l2;
tapered cutting edge length, l1.
Unless otherwise stated, these reamers are right-hand cutting.