Hex frame bolts have a ridge or skirt (flange) around the bolt head that distributes the clamping load when the bolt is tightened. The flange works like a washer.
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GRADE 8 INDENTED HEX FLANGE SCREW (FRAME BOLT) BLACK PHOSPHATE & OIL (INCH)

1/4-20 X 1/2 HEX FRAME BOLT GRADE 8 BLACK PHOSPHATE & OIL
Web Price $367.00
GRADE 8 INDENTED HEX FLANGE SCREW (FRAME BOLT) BLACK PHOSPHATE & OIL (INCH)

1/4-20 X 5/8 HEX FRAME BOLT GRADE 8 BLACK PHOSPHATE & OIL
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GRADE 8 INDENTED HEX FLANGE SCREW (FRAME BOLT) BLACK PHOSPHATE & OIL (INCH)

1/4-20 X 3/4 HEX FRAME BOLT GRADE 8 BLACK PHOSPHATE & OIL
Web Price $335.42
GRADE 8 INDENTED HEX FLANGE SCREW (FRAME BOLT) BLACK PHOSPHATE & OIL (INCH)

1/4-20 X 1 HEX FRAME BOLT GRADE 8 BLACK PHOSPHATE & OIL
Web Price QUOTE
GRADE 8 INDENTED HEX FLANGE SCREW (FRAME BOLT) BLACK PHOSPHATE & OIL (INCH)

1/4-20 X 1 1/4 HEX FRAME BOLT GRADE 8 BLACK PHOSPHATE & OIL
Web Price $335.32
Diameter N/A 1/4
Pitch N/A Coarse
Length N/A 1/2 N/A 5/8 N/A 3/4 N/A 1 N/A 1 1/4
Material N/A Grade 8
Finish N/A Black Phosphate & Oil
Package Quantity N/A 2700 N/A 2500 N/A 2200 N/A 2000 N/A 1700