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ISO 7040 vs UNI 7473

ISO 7040 (ISO) and UNI 7473 (UNI) are equivalent fastener standards that specify the same or very similar products. Both standards cover 10 fastener types in our database.

Are ISO 7040 and UNI 7473 the same?

ISO 7040 (ISO standard) and UNI 7473 (UNI standard) are equivalent standards that define the same fastener geometry and mechanical requirements. Minor differences may exist in tolerances, marking requirements, or referenced test methods, but the products are interchangeable in most applications. Always verify specific project requirements with your engineer.

Standard Overview

Property	ISO 7040	UNI 7473
Standard Body	ISO	UNI
Product Types	10 fastener types
Interchangeable?	Yes — equivalent standard

Fastener Types Covered by Both Standards

Product	Category	Has Specs
Prevailing Torque Type Hexagon Regular Nuts (with Non-Metallic Insert) - Property Classes 5, 8 and 10	Hex Nuts > Style NE Nylon Insert Locknut	✓
Prevailing Torque Type Hexagon Nuts (with Non-metallic Insert), Style 1	Hex Nuts > Style NE Nylon Insert Locknut	✓
Prevailing Torque Type Hexagon Nuts (with non-metallic insert), Style 1 - Property Classes 5,8 and 10	Hex Nuts > Style NE Nylon Insert Locknut	✓
Prevailing Torque Type Hexagon Nuts with Polyamide Ring-ISO Metric Coarse and Fine Thread - Product Grade A	Hex Nuts > Style NE Nylon Insert Locknut	✓
Prevailing Torque Type Hexagon Nuts（With Non-Metallic Insert）,Style 1	Hex Nuts > Style NE Nylon Insert Locknut	✓

Dimensional Specifications (mm)

From: Prevailing Torque Type Hexagon Regular Nuts (with Non-Metallic Insert) - Property Classes 5, 8 and 10 — applies to both ISO 7040 and UNI 7473

Size	P	e	r	k_max	k_min	s_max	s_min	ds_max	ds_min	k_nominal	ds_nominal
M10	3.5	45	46	50.85	32.6	32.40	30.00	24.3	19.44	42.75	30.1
M12	4	53.8	55

Surface Treatment for ISO 7040 / UNI 7473 Fasteners

Both ISO 7040 and UNI 7473 fasteners are available with various surface treatments. Common options for these standards include:

Zinc Plating

96–400 hours salt spray

Zinc-Nickel Plating

720–1500 hours salt spray

Hot-Dip Galvanizing

500–1000 hours salt spray

Technical Specifications & Availability

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