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The Knurled Insert with Large Sealed Head combines all the features of the standard knurled inserts plus weathertight security provided by a PVC foam seal bonded to the underside of the head. These sealed inserts will withstand 50 PSI (3.4bars) of pressure and can be used in punched or drilled holes. During insertion, the knurled body expands 360º to fill the hole creating exceptional torque strength and resistance to vibration. A backside flange also forms, even in multiple thicknesses of materials without any need for adjustments.
Unit of Measure

Specifications

Material

 N/A Steel 1010/1008

Thread Size

 N/A 5/16-18

Head Height

 N/A 0.035 in

Mounting Hole Diameter

 N/A 0.531 in

Finish

 N/A Yellow Zinc Dichromate

Head Outside Diameter

 N/A 0.685 in

Maximum Dimension D

 N/A 0.530 in

Grip Call Out

 N/A 312

Thread Call Out

 N/A 518

Maximum Dimension Il

 N/A 0.425 in

Length

 N/A 0.805 in

Restriction of Hazardous Substances Directive Standard

 N/A No

Maximum Grip Size

 N/A 0.250 in

End Features

 N/A Open

Minimum Grip Size

 N/A 0.115 in

Pressure

 N/A 50 psi3.4 bar

Industry Standards/Certifications

 N/A Unified National Coarse (UNC)

Features and Benefits

Features and Benefits

 N/A
  • Punched or Drilled Holes
  • Weathertight to 50 PSI (3.4 bars)
  • Exceptional Torque Strength - 360º hole-filling expansion also resists vibration
  • Spin Out Resistance in drilled or punched holes
  • Backside Flange forms during installation
  • Avoids Stress Fractures and prolongs punch & die life
  • Superior Thread Strength from internal rolled thread manufacturing process
  • Threads Gauge before & after installation to prevent thread dilation
  • Reduce Inventory - 250% larger grip range than standard rivet nuts
  • Superior Corrosion Resistance offered by several material/finish options
  • Quality Installation for varying thickness materials needs no adjustment when using special installation tools, locatable anywhere in assembly, before or after finish. (Special Installation tools are also available from EFC International.)

Note

Note

 N/A These inserts are to be used with Grade 5 or Metric Class 8.8/9.8 mating screws. The PVC Foam Seal is not recommended for use with petroleum based liquids. All sizes available are listed on this page, in a representative sampling of materials, finishes and end options (Open for most versatility, and Closed to eliminate leakage past threads). Contact EFC International directly for any sizes not shown in the specific material, finish or design your application requires.
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