Black Oxide Set Screws
(Typically alloy steel, heat-treated)
Primary Use Cases
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High holding force applications
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Set-and-forget mechanical joints
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Dry, controlled environments
Why You Choose Black Oxide
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Higher hardness & strength
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Much greater surface hardness than stainless
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Better bite into shafts (especially with cup or cone points)
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Superior torque capacity
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Less thread deformation
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Lower galling risk
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Stainless-on-stainless galling is avoided
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Cost effective
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Cheaper than 316 SS
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Low reflectivity
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Preferred in machinery, optics, firearms, industrial equipment
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Typical Applications
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Shaft collars
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Couplings
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Pulleys
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Gears
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Motor shafts
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Fixtures and jigs
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Robotics joints (indoor / controlled)
Limitations
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Minimal corrosion resistance
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Will rust without oil or dry environment
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Not suitable for:
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Marine
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Outdoor
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Washdown
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Food environments
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