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5/16"-18 UNC x 1/2", Flanged Button Socket Cap Screw, Full Thread, Alloy Steel, Black Oxide

Unbrako Part No. B116423


Item Flanged Button Head Socket Screw
System of Measurement Inch
Diameter 5/16
Thread Pitch / TPI 18
Length 1/2
Thread Type UNC (Coarse)
Thread Style Fully Threaded
Material Alloy Steel
Finish Black Oxide
Hex Key Size 3/16"
Thread Direction Right Hand
Standard Meets or Exceeds ASME B18.3; BS 2470
Pack Type Bulk


Unbrako Flange Button Socket Head Cap Screws allow the covering of large diameter holes, and are ideal to fix strips, cover plates and sheet metal. The radius on the Flange Button Head presents a streamlined profile, virtually eliminating the sharp edges which could occur with a bolt and washer assembly. As the large under head surface pressure by area is low, they can also be used with softer materials without harm or damage.

  • Flange facilitates greater load spread and streamlined appearance.
  • Deep, accurate socket for maximum key engagement.
  • Precision forged head for continuous grain flow and maximum strength.

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