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Rockwell hardness of collets

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Adam Harris	02/07/2021 00:03:34
533 forum posts 26 photos	I have seen an ad for some Chinese SK25 spring collets on Alibaba stating hardness of HRC44-48 and I am curious as to how this compares with a recognized quality brand of similar collets with 6 leaves. Can anyone throw some light on this, and also the range of HRC generally targeted in say manufacturing ER collets? Edited By Adam Harris on 02/07/2021 00:12:42
Adam Harris	02/07/2021 00:21:54
533 forum posts 26 photos	I should mention that the collet material stated by this Chinese maker is 65Mn steel - I have no idea if that is generic or not for SK25 collets...
Michael Gilligan	02/07/2021 07:25:12
23121 forum posts 1360 photos	I would think that is towards the low end of useful hardness … but I’m more familiar with watchmaker’s collets, so may be mis-judging. MichaelG.
David Jupp	02/07/2021 08:10:16
978 forum posts 26 photos	HRc 44-48 corresponds approximately (you'll get different figures from different sets of tables) to 415-445 Brinell, 440-475 VPN, or a tensile strength of roughly 94-104 Tsi, 1455-1590 MPa. Don't expect these different units to be exactly equivalent - they are just indicative.
Tony Pratt 1	02/07/2021 08:31:54
2319 forum posts 13 photos	I'm with Michael G, 44-48 Rockwell C is not hard at all. The cynic in me is thinking that these specs are just pie in the shy anyway, a lot of the tooling ads state 'facts' which don't make a lot of sense. Tony
Michael Gilligan	02/07/2021 08:48:03
23121 forum posts 1360 photos	Sorry it’s off-topic, but here’s a helpful page about Rockwell Hardness of steels: LINK https://www.yorksaw.com/rockwell-hardness/ MichaelG.

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