Overview
EN ISO 4035:2023 - Fasteners: Hexagon thin nuts (style 0) specifies the characteristics, dimensions and product requirements for hexagon thin nuts (style 0) manufactured in steel and stainless steel with metric coarse pitch threads M1.6 to M64. Published by CEN/ISO, this fifth-edition standard covers product grades A and B and includes rules for marking, labelling and designation. It also warns that thin nuts have reduced loadability and are not intended to resist thread stripping when used alone - thin nuts used as jam nuts must be assembled together with a regular or high nut.
Key topics and technical requirements
- Scope and materials: Applies to steel and stainless-steel hexagon thin nuts (style 0). Stainless steel grades and property classes can be selected from ISO 3506-2 where needed.
- Thread range and dimensions: Covers metric coarse pitch threads M1.6 to M64. Detailed dimensions given for M5 to M39; Annex A covers sizes D < M5 and D > M39.
- Product grades: Defines Product grade A (commonly D ≤ M16) and Product grade B (D > M16) with specific dimensional tolerances shown in tables.
- Mechanical and heat-treatment: References mechanical properties and heat-treatment rules in ISO 898-2 for steel nuts and ISO 3506-2 for stainless steel.
- Tolerances and threads: Thread tolerance class 6H and reference to ISO 965-1 for thread tolerancing.
- Surface condition and coatings: Guidance for coatings and finishes referencing ISO 4042, ISO 10683, ISO 10684 and acceptance of surface discontinuities per ISO 6157-2.
- Marking and labelling: Product marking follows ISO 898-2 / ISO 3506-2; package labelling must include at least reference to ISO 4035, thread size D, material/property class, finish, manufacturer ID, lot number and quantity.
- Designation and acceptance: Designation per ISO 8991; acceptance inspection per ISO 3269.
Practical applications and users
- Engineers and designers specifying jam nuts, thin locking nuts, or low-profile hex nuts in mechanical assemblies.
- Fastener manufacturers and quality managers who need to produce, inspect, mark and certify hexagon thin nuts to European and international requirements.
- Procurement, maintenance and OEM teams requiring standardized metric thin nuts for automotive, machinery, electrical panels and general engineering applications.
- Test labs and conformity bodies performing dimensional and acceptance inspections.
Related standards
Keywords: EN ISO 4035:2023, ISO 4035, hexagon thin nuts, style 0, metric nuts M1.6–M64, fasteners, jam nut, product grade A, product grade B, stainless steel nuts, ISO 898-2, ISO 3506-2.
