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ZINC-FLAKE · ISO 10683 FASTENER REFERENCE

Zinc-Flake Coating Systems for Steel Fasteners

ISO 10683 covers non-electrolytically applied zinc-flake coating systems for steel fasteners, with or without top coat and lubricant. The RFQ should identify the fastener, substrate condition, complete coating-system requirement, friction or assembly requirement and contract-defined inspection evidence.

Configure Non-electrolytic zinc-flake job work Review specifications

Silver and black zinc-flake coated high-strength fasteners — Non-electrolytic zinc-flake job work reference image

ISO 10683 fastener reference
Silver, black or custom inquiry
Top coat and lubricant captured when required
No unsupported service-life conversion

TECHNICAL SUMMARY

What to include in the inquiry

Use the applicable drawing and governing standard as the final authority. Other / Custom keeps unusual requirements inside the same RFQ.

ProcessNon-electrolytically applied zinc-flake coating system

ReferenceISO 10683:2018 for steel fasteners

Finish inquirySilver, Black or Other / Custom

System optionsWith or without top coat and lubricant, as specified

Assembly inputFriction / lubrication requirement where tightening performance matters

Report optionsDFT / coating-thickness and salt-spray reports when specified

TECHNICAL REFERENCE

Coating and inspection tables

These tables identify the applicable technical reference and the information that must be agreed in the purchase specification. They do not replace the governing standard, drawing or customer acceptance criteria.

ISO 10683 zinc-flake RFQ checklist

Field	Required definition	Scope caution
Fastener	Product standard, size, thread and lot identity	Coating must not compromise thread fit or functional dimensions
Substrate	Material, property class / strength and surface condition	High strength does not eliminate the need for process-risk review
Coating system	Designation, finish colour, top coat and any sealant	‘Zinc flake’ alone is not a complete designation
Lubrication	Integral / added lubricant and friction requirement when specified	Finish appearance does not define tightening behaviour
Corrosion evidence	Test method, duration, significant surfaces and acceptance criterion	Do not convert laboratory hours to service life

What an inspection report should identify

Report content must follow the purchase order, governing standard and agreed inspection plan.

Evidence	What must be identified	Important boundary
Coating-thickness / DFT report	Part or lot identity, measurement method, measurement locations, units and recorded values	The method must suit the coating/substrate combination and part geometry; DFT is not a universal method name for every metallic coating.
Salt-spray report	Test standard and mode, specimen identity, exposure duration, evaluation intervals and agreed failure criterion	A pass/fail conclusion requires acceptance criteria from the product or customer specification.
Visual and coverage inspection	Significant surfaces, coverage, visible defects and any permitted contact or rack marks	Appearance limits must be agreed; colour alone does not establish coating performance.
Functional verification	Thread fit, masking, contact areas, dimensional limits or other drawing-defined features	The required checks depend on the component and are not implied by the coating name.

Reports are available when specified in the RFQ and confirmed in the quotation. Sampling, laboratories, witness points and acceptance criteria must be agreed before processing.

How to specify a salt-spray requirement

ISO 9227 defines the chamber, reagents and procedures for NSS, AASS and CASS testing. It does not assign a universal exposure period to a product.

RFQ item	Buyer should state	Why it matters
Test method	The governing product specification and the required salt-spray mode, such as NSS when applicable	Different methods and solution chemistries are not interchangeable.
Exposure duration	The exact duration required by the drawing, standard or customer specification	ISO 9227 does not prescribe one duration for every coating or product.
Acceptance criterion	What is evaluated, where it is evaluated and the permitted result	Hours alone are incomplete without a defined failure criterion.
Specimen and preparation	Production parts or panels, significant surfaces, edge treatment and any preconditioning	Specimen preparation can materially affect the result.
Use of the result	Quality-control or specification-compliance purpose	ISO 9227 states that salt spray is not intended to rank different materials or predict long-term field corrosion resistance.

Do not convert salt-spray hours into service life. Field performance depends on the complete coating system, substrate, geometry, handling and real exposure environment.

SCOPE

Use ISO 10683 for the defined steel-fastener route

The standard applies to bolts, screws, studs, nuts and non-threaded fasteners such as washers, pins and clips. It does not cover mechanically applied zinc coatings.

HIGH-STRENGTH FASTENERS

Review the complete coating and assembly system

ISO 10683 notes use on high-strength fasteners to avoid internal hydrogen embrittlement associated with electrolytic deposition. This does not remove the need to identify material strength, preprocessing and all project controls.

FRICTION

State lubricant or friction requirements explicitly

Integral or subsequently added lubricant can be part of the coating system. For tightened joints, provide the governing torque–tension or coefficient-of-friction requirement rather than assuming one from the finish name.

CORROSION

Tie salt-spray evidence to the product specification

Provide the test mode, duration, evaluation and permitted result. Salt-spray test hours must not be presented as predicted outdoor life.

BUYER QUESTIONS

Frequently asked questions

Is zinc-flake an electroplated coating?

No. ISO 10683 covers non-electrolytically applied zinc-flake coating systems.

Does ISO 10683 cover mechanically applied zinc?

No. The standard scope explicitly excludes mechanically applied zinc coatings.

Should friction be stated in the RFQ?

Yes when tightening performance matters. State the governing lubricant, coefficient-of-friction or torque–tension requirement from the assembly specification.

BUILD ONE MULTI-ITEM RFQ

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Describe the supplied parts, define the coating and reporting requirements, then provide buyer and delivery details once at the end.

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