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DIN EN ISO 7040 vs NF E 25-409

DIN EN ISO 7040 (DIN) and NF E 25-409 (NF) are equivalent fastener standards that specify the same or very similar products. Both standards cover 10 fastener types in our database.

Are DIN EN ISO 7040 and NF E 25-409 the same?

DIN EN ISO 7040 (DIN standard) and NF E 25-409 (NF 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	DIN EN ISO 7040	NF E 25-409
Standard Body	DIN	NF
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 DIN EN ISO 7040 and NF E 25-409

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 DIN EN ISO 7040 / NF E 25-409 Fasteners

Both DIN EN ISO 7040 and NF E 25-409 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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