Tap bolts are usually hex head bolts threaded up to the head, with a machined point and a fully threaded shank.

Usually of low carbon or grade 5 steel, tap bolts are used in a drilled and tapped hole that is threaded over its full length. Tap bolts are also used instead of a stud and a nut, to be screwed into some fixed part, rather than passing through the part and receiving a nut.
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GRADE 5 HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 1/2 TAP BOLT GRADE 5 ZINC
Web Price $246.36
GRADE 5 HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 3/4 TAP BOLT GRADE 5 ZINC
Web Price $224.96
GRADE 5 HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 3/4 TAP BOLT GRADE 5 ZINC
Web Price $17.33
GRADE 5 HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 1 TAP BOLT GRADE 5 ZINC
Web Price $210.60
GRADE 5 HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 1 TAP BOLT GRADE 5 ZINC
Web Price $19.24
Diameter N/A 1/4
Pitch N/A Coarse
Length N/A 1/2 N/A 3/4 N/A 3/4 N/A 1 N/A 1
Material N/A Grade 5
Finish N/A Zinc Plated
Package Quantity N/A 3300 N/A 2600 N/A 100 N/A 2200 N/A 100