Hardness Conversion Chart

ROCKWELLROCKWELLBRINELLVICKERSTENSILEPSI
HARDNESSHARDNESSHARDNESSHARDNESSSTRENGTH(1000lb/in2)
(HRb)(HRc)(HB)(HV)(N/mm2)
67–12112240158
Solid Carbide Tools 70–12612743263
73–13213244865
75–13613745566
77–14014346367
80–14715047969
82–15315649472
84–15916352576
KYOCERA SGS Precision Tools (KSPT) is an ISO-certified manufacturer of industry leading round solid carbide86–16517154078
cutting tools. State of the art manufacturing and warehouse facilities have the capacity and processes to meet the 2018 Global Product Catalog89–17717855681
91–18618860288
quality and delivery demands of customers in all markets around the world. Complete inspections performed93–19719663292
within its metallurgical lab and manufacturing quality departments ensure the use of high quality carbide and96–21621266497
97–223218695101
reliable manufacturing consistency regardless of when a cutting tool is produced.9821230234756110
–22236241772112
–23242247787114
KSPT is proud to have pioneered some of the world’s most advanced cutting technologies due to rigorous testing–24248255818118
of tools, coatings, and materials within its Global Innovation Center. It is this commitment to innovation that has–25254261849123
–27266269865125
launched patented products and technologies like the Z-Carb with its variable geometry and cutting edge prepara-–28272275895130
–29278284911132
tion, Series 43 APR® and APF® ultra high performance aluminum cutting tools, and the JetStream coolant technology.
–30284292942136
–31293300973141
–32302308988143
SGS has become an important part of the KYOCERA Precision Tools family, and while the name has changed, one
–333103181019147
thing has not. Its dedicated people and their relentless commitment to the customer. KSPT Technical Sales Engi-–343193271050152
–353283371096159
neers, Application Specialists, and Distribution Partners blanket the globe, delivering reliable service and support
–373453491127163
to all market segments. It is these people and products that drive innovative application strategies and cutting tool–383533591158168
–393623701189172
technologies into the end user, continually exceeding expectations and providing the most Value at the Spindle®.
–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 www.kyocera-sgstool.com 379