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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A307 GRADE A HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 3/4 TAP BOLT A307 GRADE A ZINC
Web Price $192.07
A307 GRADE A HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 3/4 TAP BOLT A307 GRADE A ZINC
Web Price $12.76
A307 GRADE A HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 1 TAP BOLT A307 GRADE A ZINC
Web Price $173.59
A307 GRADE A HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 1 TAP BOLT A307 GRADE A ZINC
Web Price $15.23
A307 GRADE A HEX TAP BOLT, ZINC CR+3 (INCH)

1/4-20 X 1 1/4 TAP BOLT A307 GRADE A ZINC
Web Price $172.20
Diameter N/A 1/4
Pitch N/A Coarse
Length N/A 3/4 N/A 3/4 N/A 1 N/A 1 N/A 1 1/4
Material N/A A307 Grade A
Finish N/A Zinc Plated
Package Quantity N/A 3000 N/A 100 N/A 2300 N/A 100 N/A 2000