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  • Designed for superior pullout resistance in plastics and thin sheet metal.
  • Pre-bulbed design requires less installation load.
  • Pre-bulbed inserts require less installation load than straight shank and require slightly larger mounting hole size.
  • Other materials available.
NOTE: The Atlas® spin-spin or spin-pull tool can be used to install pre-bulbed inserts. Material hardness will affect the published grip ranges. Trial installations of this product in your application are recommended. We will be happy to provide samples for this purpose.
Unit of Measure

Thread Size

N/A 1/4-20

Grip Range

N/A .020 - .280 in

Identification Mark

N/A None

øB Nom.

N/A .625 in a1053.jpg

C Nom.

N/A .057 in

øD Max.

N/A .384 in

M Ref.

N/A .520 in

Hole Size in Sheet + .006 - .000

N/A .390 in

Fastening

N/A Installed

Thread Specification

N/A 2B per ASME B1.1

Standard Material

N/A Low Carbon Steel

Standard Finish

N/A RoHS Compliant Zinc Yellow

CAD Supplier

N/A PennEngineering® (Atlas®)