Hardness Conversion Table

Knowing the hardness of the work material to be tapped is essential

in selecting the best tap for the job.

10 mm/min120°1/16"1000 lb10 mm/min120°1/16"1000 lb
ballconeballperballconeballper
3000 kg150 kg100 kgmodel Csq. in.3000 kg150 kg100 kgmodel Csq. in.
ShoretensileShoretensile
BrinellRockwell CRockwell BScleroscopestrengthBrinellRockwell CRockwell BScleroscopestrength
800721002763010542136
78071992692910441132
76070982612810340129
74568973672582710239127
72567963572552610239125
71266953502492510138123
68265933372452410037119
6686491326240239936117
6526389318237239935115
6266287306229229834113
6146185299224219733110
6016083292217209633107
5905981290211199532104
5765779281206189432102
5525676270203179431100
545557526820016933198
529547425919615923096
514531207225419114923094
502521197024718713912992
495511196924418512912991
477491186723318311902890
461481176622718010892889
45147117652231759882786
44446116642191707872784
42746115622091676872782
41544115602041655862681
40143114581961634852680
38842114571911603842578
37541113551841562832576
37040112541821541822575
3623911153179152822474
3513811151173150812474
3463711050170147802472
3413711049168145792371
3313610947163143792370
3233510946158141782369
3113410846153140772269
3013310745148135752267
2933210644144130722265
2853110543140