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

Black Oxide & Electroless Nickel - Erie Protective Coating

Also known as tugger bolts, the table size and thread size are the same. Material is 4140 steel, comparable to grade 8. Workholding components.

4140 Steel T-Bolt, Black Oxide Finish, Square Head, 2 Threaded Length, 2-1/2 Length, Partially Threaded, 3/8-16 UNC Threads, Made in US (Pack of 2)

Trail One Components Titanium Stem Bolts Upgrade Kit, 44% OFF

Black Oxide Gallmar Industries LLC

LUMICLAD Zero-Discharge Black Oxide Finish From: Birchwood Technologies, formerly Birchwood Casey

Trail One Components Titanium Stem Bolts Upgrade Kit, 44% OFF

What is Black Oxide Coating? Everything You Need to Know - PTR

Black Oxide Coating: Process, Types, and Applications

Monster Bolts - Fastener news

How To Achieve OEM Black Oxide Coating Appearance - Metal Blackening System from Eastwood