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HS6-5-2-5

1.3243
tool_steelhigh_speed
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Standard cobalt high speed steel with 5% Co — the most widely used cobalt HSS grade. Also known as M35 or HSS-E/HSSE. Better hot hardness and cutting performance than M2, lower cost than M42. HRC 64-66 hardened. The "go-to upgrade" when M2 performance is insufficient. Used for drill bits (HSS-Co branded), taps, end mills, saw blades, and general-purpose cutting tools for stainless steel and medium-hard alloys.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI M35 / UNS T11335T11335REF
🇪🇺ENEuropeHS6-5-2-5 / 1.32431.3243100%
🇯🇵JISJapanSKH55—100%

Sources: ASTM A600, EN ISO 4957, JIS G4403

Chemical composition comparison (wt%)

Side-by-side: HS6-5-2-5 (EN ISO 4957) vs HS6-5-2-5 / 1.3243 (EN) (EN ISO 4957)

ElementHS6-5-2-5 (EN ISO 4957)HS6-5-2-5 / 1.3243 (EN)Overlap
C—0.86–0.94%—
Si—0–0.45%—

Mechanical properties

Compatibility verdict

HS6-5-2-5 and HS6-5-2-5 / 1.3243: 100% composition match

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