Fastener Guide / Plating, Coatings & Finishes

Olive Drab Chromate

Olive drab is a heavy chromate over zinc giving a dull green finish, long used on military hardware. Traditional olive drab is hexavalent; trivalent alternatives exist.

Last reviewed 2026-09-10 · Governing standard: ASTM B633; drawing / program requirements · reference FG-98E39F · Report an error on this sheet

Olive drab at a glance

SpecificationASTM B633 Type II (hexavalent) or Type VI (trivalent)
CorrosionAmong the highest of the chromate colors
UseMilitary and defense-style equipment
RoHSHexavalent versions are restricted

These tables carry the same figures as the printed sheet below.

The printed sheet

Olive Drab Chromate

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Text version of this sheet

Olive drab chromate · military look

FIELD IDENTIFICATION

What it is

Olive drab is a heavy chromate over zinc giving a dull green finish, long used on military hardware.

Traditional olive drab is hexavalent; trivalent alternatives exist.

OLIVE DRAB

Olive green chromate

Olive drab at a glance

Specification

ASTM B633 Type II (hexavalent) or Type VI (trivalent)

Corrosion

Among the highest of the chromate colors

Use

Military and defense-style equipment

RoHS

Hexavalent versions are restricted

Key points

Electroplating can load high-hardness steel with hydrogen. Parts at roughly HRC 39 and above (Grade 8, 10.9, 12.9, A574) need a qualified process and a

prompt embrittlement-relief bake, or a non-electrolytic coating instead.

Governing standards: ASTM B633; drawing / program requirements. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always

take precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-98E39F · thefastenerapp.com/fastener-guide/plating-coatings-finishes/olive-drab-chromate · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Yellow Zinc / DichromateBlack Zinc →

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Share of the rep’s business

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Premier Electric Group5.9%
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Coastal Maintenance Group3.3%
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CustomerHours a monthHours a week
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