Hardness Conversion Chart

VALUE AT THE SPINDLE®

ROCKWELLROCKWELLBRINELLVICKERSTENSILEPSI
HARDNESSHARDNESSHARDNESSHARDNESSSTRENGTH(1000lb/in2)
(HRb)(HRc)(HB)(HV)(N/mm2)
Solid Carbide Tools67–12112240158
70–12612743263
73–13213244865
75–13613745566
77–14014346367
KYOCERA SGS Precision Tools (KSPT) is an ISO 9001:2015 Certified manufacturer of industry leading round solid80–14715047969
carbide cutting tools. State of the art manufacturing and warehouse facilities have the capacity and processes82–15315649472
84–15916352576
to meet the quality and delivery demands of customers in all markets around the world. Complete inspections86–16517154078
performed within its metallurgical lab and manufacturing quality departments ensure the use of high quality89–17717855681
91–18618860288
carbide and reliable manufacturing consistency regardless of when a cutting tool is produced.93–19719663292
96–21621266497
97–223218695101
KSPT is proud to have pioneered some of the world’s most advanced cutting technologies due to rigorous testing9821230234756110
–22236241772112
of tools, coatings, and materials within its Global Innovation Center. It is this commitment to innovation that has
–23242247787114
launched patented products and technologies like the Z-Carb with its variable geometry and cutting edge prepara-–24248255818118
–25254261849123
tion, Series 43 APR® and APF® ultra high performance aluminum cutting tools, and the JetStream coolant technology.
–27266269865125
–28272275895130
–29278284911132
SGS has become an important part of the KYOCERA Precision Tools family, and while the name has changed, one
–30284292942136
thing has not. Its dedicated people and their relentless commitment to the customer. KSPT Technical Sales Engi-–31293300973141
–32302308988143
neers, Application Specialists, and Distribution Partners blanket the globe, delivering reliable service and support
–333103181019147
to all market segments. It is these people and products that drive innovative application strategies and cutting tool–343193271050152
–353283371096159
technologies into the end user, continually exceeding expectations and providing the most Value at the Spindle®.–373453491127163
–383533591158168
–393623701189172
–403703811235179
–413813951266183
–423914081312190
–444114221359197
–454224371420206
–464334521467212
–484554701513219
–504794971559226
–514855171621235
–524975321668241
–54–5731729250
–56–6091807262
–57–6301884273
–59–6701961284
–60–6982039295
–61–725––
–62–740––
–63–780––
–64–812––
–65–847––
–66–885––
–67–926––
–68–971––

Conversions from each scale are approximate