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.
Unit of Measure
Items
GRADE 5 HEX TAP BOLT, ZINC YELLOW CR+6(INCH)

1/4-20 X 2 TAP BOLT GRADE 5 YELLOW ZINC
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GRADE 5 HEX TAP BOLT, ZINC YELLOW CR+6(INCH)

1/4-20 X 3 TAP BOLT GRADE 5 YELLOW ZINC
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GRADE 5 HEX TAP BOLT, ZINC YELLOW CR+6(INCH)

3/8-16 X 2 1/2 TAP BOLT GRADE 5 YELLOW ZINC
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GRADE 5 HEX TAP BOLT, ZINC YELLOW CR+6(INCH)

1/2-13 X 3 1/2 TAP BOLT GRADE 5 YELLOW ZINC
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GRADE 5 HEX TAP BOLT, ZINC YELLOW CR+6(INCH)

5/8-11 X 2 TAP BOLT GRADE 5 YELLOW ZINC
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Diameter N/A 1/4 N/A 1/4 N/A 3/8 N/A 1/2 N/A 5/8
Pitch N/A Coarse
Length N/A 2 N/A 3 N/A 2 1/2 N/A 3 1/2 N/A 2
Material N/A Grade 5
Finish N/A Yellow Zinc Plated
Package Quantity N/A 1600 N/A 900 N/A 500 N/A 150 N/A 250