• Top of Head. Top of head shall be full form and chamfered, with the diameter of chamfer circle being equal to the maximum width across flats within a tolerance of minus 15 percent.
  • Wrenching Height, J. Wrenching height is a distance measured from the bearing surface up the side of the head at the corners. The width across corners shall be within specified limits for the full wrenching height.
  • Bearing Surface. Bearing surface shall be flat and washer
Unit of Measure

Manufacturer

Manufacturer

N/A Industrial Fasteners Institute

Specifications

Product

N/A Square and Hex Bolts and Screws

Unit of Measure

N/A English

Nominal Size or Basic Product Diameter

N/A 5/8 in

Nominal Size or Basic Product Diameter (Decimal)

N/A 0.6250 in

Max. Body Diameter (E)

N/A 0.6250 in

Min. Body Diameter (E)

N/A 0.6170 in

Basic Width Across Flats (F)

N/A 15/16 in

Max. Width Across Flats (F)

N/A 0.938 in

Min. Width Across Flats (F)

N/A 0.922 in

Max. Width Across Corners (G)

N/A 1.083 in

Min. Width Across Corners (G)

N/A 1.051 in

Basic Head Height (H)

N/A 25/64 in

Max. Head Height (H)

N/A 0.403 in

Min. Head Height (H)

N/A 0.378 in

Min. Wrenching Height (J)

N/A 0.269 in

Max. Transition Thread Length (Y)

N/A 0.455 in

Max. Circular Runout of Bearing Surface FIM

N/A 0.017 in

Codes and Standards

Codes and Standards

N/A ASME B18.2.1 1996

Thread Length for Screw Lengths

Nom. LT for Screw Length (6 in. and Shorter)

N/A 1.500 in

Nom. LT for Screw Length (Over 6 in.)

N/A 1.750 in
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