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A "collar flanged nut," also commonly called a "flange nut" or "collar nut," is a type of fastener featuring a threaded section with a built-in flange or collar at one end, essentially acting like an integrated washer that distributes clamping pressure over a wider area on the material being secured, preventing damage and providing increased holding power, particularly in applications with potential vibration; it eliminates the need for a separate washer during assembly. Key points about collar flanged nuts:

• Function:The flange design allows for better load distribution, making it suitable for situations where high clamping force is needed or where there's a risk of material damage from concentrated pressure. 
• Applications:Commonly used in construction, automotive, machinery, and industrial applications where a secure fastening with wide load distribution is required. 
• Material options:Can be made from various materials like carbon steel, stainless steel, or aluminum, depending on the application's corrosive environment and required strength. 
• Benefits:
  • Reduces the need for a separate washer, simplifying assembly 
  • Provides better stability and resistance to loosening under vibration 
  • Distributes clamping force over a larger surface area 

• Collar Nuts and Washer Nuts - WDS ComponentsCollar nuts, also known as flange nuts, feature a wide flange or collar at one end that acts as an integrated washer. This design ...WDS Components
• Collar Nuts | DIN 6331Collar Nuts are also known as Flanged or Flange Nut with Collar or integral washer. These are Quality nuts that are turned, milled...CBH Fasteners Is An ISO Certified & Fasteners Manufacturer ...
• Collar Nuts DIN 6331 (height 1,5 d) - EH 23080.Stainless steel 1.4305. d1 [mm]: M10. m [mm]: 15 mm. s [mm]: 17 mm. 23080.0110 2) Quantity: Stainless steel. d1: M10. a: 4 mm. d2:Halder
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A "Extension Nut" is a type of hexagonal nut with a significantly longer thread length compared to a standard hex nut.