PROFESSIONAL MANUFACTURER OF HARDWARE PRODUCTS
Jinan Meierde Industry Co., Ltd
Heavy Industry M6 M8 M10 M12 M14 M16 Galvanized Carbon Steel Hexagon Nut Industry
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Product introduction
What is a Thin Hex Nut?
A thin hex nut (also known as a hex jam nut, low-profile hex nut, or flat nut) is a precision fastening component characterized by its significantly reduced height compared to a standard hex nut. Typically, its thickness is only about half that of a standard nut of the same specification. Despite its compact profile, it delivers reliable fastening performance and is engineered for applications where space is at a premium or where a secondary locking nut is required
Key Technical Specifications & Standards
Thin hex nuts are manufactured according to strict international standards to ensure dimensional accuracy, mechanical properties, and interchangeability. The primary standards governing thin hex nuts include:
| Standard | Description | Thread Range |
|---|---|---|
| ISO 4035:2023 | Fasteners — Hexagon thin nuts (style 0) | Metric coarse pitch M1.6 to M64 |
| ISO 10511:2025 | Fasteners — Prevailing torque hexagon nuts — Thin nuts (with non-metallic insert) | Metric coarse pitch M3 to M39 |
| DIN 439 | Hexagon thin nuts | M2 to M64 |
| GB/T 6172.1-2016 | Chinese national standard for hexagon thin nuts | M1.6 to M64 |
| GB/T 6174-2016 | Chinese national standard for unchamfered hexagon thin nuts | M1.6 to M10 |
Product Grades
Thin hex nuts are typically available in two product grades:
Product Grade A: For nuts with thread diameters up to and including M16.
Product Grade B: For nuts with thread diameters above M16
Dimensional Overview
While specific dimensions vary by standard and thread size, the defining characteristic is the reduced height.
Height (Thickness): Significantly lower than standard hex nuts. For example, a standard hex nut has a height of approximately 0.875 × D, while a thin/jam nut has a height of approximately 0.5 × D.
Width Across Flats: Maintains standard hex dimensions for easy tool engagement (e.g., 5.5mm for an M4 nut).
Applications & Industries
Thin hex nuts are widely used across industries where space is constrained, weight reduction is critical, or a secondary locking mechanism is required.
Automotive: Engine components, chassis assemblies, powertrain systems
Aerospace: Aircraft structures, holding components together
Electronics: Precision devices, compact assemblies
Industrial Machinery: Equipment assembly, guide bushings, rod end bearings
Construction: General construction, structural applications
Marine Hardware: Offshore equipment, saltwater environments
Renewable Energy: Solar panel mounting, wind turbine assemblies
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