HSS Tooling Blanks

This topic has 2 replies, 3 voices, and was last updated 4 November 2025 at 17:32 by SillyOldDuffer.

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4 November 2025 at 15:13 #823086
Phil S
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@phils66830
I have inherited a quantity of Osborn branded 1/4″ and 3/8″ square section HSS blanks marked SOBV or perhaps SO BV. Does anyone recall what grade this might be ?….Likely to be 40+ years old so web searches have not helped.

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4 November 2025 at 15:39 #823090
Richard B
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@richardb44403
Found this may help.

An English cutting alloy sold by Samuel Osborn & Co Ltd under the name SOBV (or S.O.B.V) cutting alloy contained high percentages of chromium, cobalt, tungsten, and iron with some vanadium and molybdenum and is more accurately described as a super HSS.
4 November 2025 at 17:32 #823103
SillyOldDuffer
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@sillyoldduffer
Grok says Osborn developed HSS from the original Mushet tool steel. SOBV dates from between 1910 and 1930 and grok suggests it’s equivalent to M42.

Dave
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HSS Tooling Blanks

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