Black Oxide Finish - What is it, How is it Made, What Does it do?

The 18-8 stainless steel spring anchor with black oxide finish has a hole on one end and a threaded body on the other to connect an extension spring

Steel Spring Anchor, Black Oxide Finish, 8-40 Thread Size, 7/8 Length, 0.100 Hole Size, Made in US

1018 Steel T-Slot Nut, Black Oxide Finish, 3/8-16 Threads, 5/8 Height, 9/16 Slot Depth, Made in US (Pack of 5) : : Tools & Home Improvement

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How to do professional quality black oxide finishing in the home workshop.

Black Oxide Finish: Techniques, Benefits and Applications - Zintilon

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1018 Steel T-Slot Nut, Black Oxide Finish, Tapped Through, 1/2-13 Threads, 5/8 Height, 9/16 Slot Depth, Made in US (Pack of 5) : : Tools & Home Improvement