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Repair scratch in black-oxide per MIL-C-13924 Class 1

January 10, 2022

Q. Hi all, I work in a ballscrew manufacturing plant. We recently have had a customer constantly sending back parts for scratches that range from a light scuff (~.030") to a more apparent scratch (~.200") on the black-oxide finish per milc13924 with a claim that bare metal is showing and it needs to be fixed. In order to meet the spec best to our knowledge we have been disassembling the part and sending out the affected component for hot black-oxide (Class 1). This is a timely rework process and I was wondering if there is an acceptance/visual standard for scratches on black-oxide or if we can use a gun blue on minor scratches and still meet the spec Class 1.

A Woo
- Livonia, Michigan

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