Serrated hex flange 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 5 HEX HD SERRATED FLANGE SCREW, ZINC CR+3 (INCH)

1/4-20 X 1/2 SERRATED HEX FLANGE BOLT GRADE 5 ZINC
Web Price QUOTE
GRADE 5 HEX HD SERRATED FLANGE SCREW, ZINC CR+3 (INCH)

1/4-20 X 1/2 SERRATED HEX FLANGE BOLT GRADE 5 ZINC
Web Price $18.24
GRADE 5 HEX HD SERRATED FLANGE SCREW, ZINC CR+3 (INCH)

1/4-20 X 5/8 SERRATED HEX FLANGE BOLT GRADE 5 ZINC
Web Price $281.35
GRADE 5 HEX HD SERRATED FLANGE SCREW, ZINC CR+3 (INCH)

1/4-20 X 5/8 SERRATED HEX FLANGE BOLT GRADE 5 ZINC
Web Price $19.77
GRADE 5 HEX HD SERRATED FLANGE SCREW, ZINC CR+3 (INCH)

1/4-20 X 3/4 SERRATED HEX FLANGE BOLT GRADE 5 ZINC
Web Price $255.33
Diameter N/A 1/4
Pitch N/A Coarse
Length N/A 1/2 N/A 1/2 N/A 5/8 N/A 5/8 N/A 3/4
Material N/A Grade 5
Finish N/A Zinc Plated
Package Quantity N/A 2800 N/A 100 N/A 2500 N/A 100 N/A 2300