Fastener Guide / Plating, Coatings & Finishes

Phosphate and Oil

Phosphate coating (zinc or manganese phosphate) is a crystalline conversion layer that holds oil. It gives a dark finish, a good paint base and consistent friction, but little corrosion protection on its own.

Last reviewed 2026-09-10 · Governing standard: ASTM F1137/F1137M-25; MIL-DTL-16232 · reference FG-6718E9 · Report an error on this sheet

Phosphate at a glance

TypesZinc phosphate; manganese phosphate
CorrosionLow without oil; better oiled
UsePaint base, break-in lubricity, drywall screws
SpecificationASTM F1137/F1137M (fasteners); MIL-DTL-16232

Governing standards: ASTM F1137/F1137M-25; MIL-DTL-16232. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take precedence over this sheet.

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

The printed sheet

Phosphate and Oil

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Text version of this sheet

Phosphate and oil

What it is

FIELD IDENTIFICATION

Phosphate coating (zinc or manganese phosphate) is a crystalline conversion layer that holds oil. It

gives a dark finish, a good paint base and consistent friction, but little corrosion protection on its own.

PHOSPHATE

Dark gray-black phosphate + oil

Phosphate at a glance

Types

Zinc phosphate; manganese phosphate

Corrosion

Low without oil; better oiled

Use

Paint base, break-in lubricity, drywall screws

Specification

ASTM F1137/F1137M (fasteners); MIL-DTL-16232

Governing standards: ASTM F1137/F1137M-25; MIL-DTL-16232. 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-6718E9 · thefastenerapp.com/fastener-guide/plating-coatings-finishes/phosphate-and-oil · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Mechanical GalvanizingZinc-Flake - ASTM F3393 Overview →

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Share of the rep’s business

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Brunswick Galvanizing Inc.14.6%
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Premier Electric Group5.9%
Tallahassee Packaging LLC3.7%
Coastal Maintenance Group3.3%
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CustomerHours a monthHours a week
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Mayport Tool & Die Inc.13.53.1
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