Thumb Nut
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Thumb Nut - Image 3
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Thumb Nut

  • DIN 466 / DIN 467
  • High Type Knurled Nut
  • Low Type (Flat) Knurled Nut
  • Multiple Materials Available

Category

Thumb nuts, also known as knurled thumb nuts or knurled nuts, are circular nuts with a knurled outer surface that provides a secure grip for manual tightening and loosening without the use of tools. The textured exterior increases friction between hand and fastener, enabling quick installation and removal in applications requiring frequent access, such as electrical panels, service covers, and mechanical assemblies.

Available Types

Type Description Standard
High Type Knurled Nut Taller profile with larger grip surface; provides greater leverage for manual tightening DIN 466
Low Type (Flat) Knurled Nut Lower profile with reduced height; suitable for applications with limited clearance DIN 467

Applicable Standards

Standard Status Description Thread Range
DIN 466:2006-08 Active High type knurled nuts – tall profile, larger grip surface M1 to M10
DIN 467:2006-08 Withdrawn (Nov 2024) Short (flat) type knurled nuts – replaced by new revision; dimensions remain industry reference M3 to M12

Materials

Material Properties Applications
Stainless Steel (A1/A2/A4) Corrosion-resistant, non-magnetic, durable Outdoor equipment, marine, electronics
Brass Water-resistant, corrosion-resistant, non-magnetic, aesthetically pleasing Sensitive electronic equipment, decorative applications
Steel High strength, zinc-plated or passivated finishes General industrial applications
Aluminum Lightweight, corrosion-resistant Aerospace, lightweight assemblies

Surface Finishes

  • Zinc Plating (blue passivated) – for steel

  • Passivation – for stainless steel

  • Natural finish – for brass and aluminum

Common Applications

  • Electrical Panels: Service covers, control panels requiring frequent access

  • Industrial Machinery: Machine guards, access doors, quick-release assemblies

  • Electronics: Sensitive equipment where non-magnetic fasteners are required

  • Outdoor Equipment: Marine and corrosion-prone environments (stainless steel/brass)

  • Furniture: Adjustable components and modular assemblies

  • Medical Devices: Equipment requiring tool-free adjustment

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