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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STAINLESS 18 8 HHCS, FULLY THREADED (INCH) ASTM F593

1/4-20 X 1 1/4 TAP BOLT 18-8 STAINLESS
Web Price $192.49
STAINLESS 18 8 HHCS, FULLY THREADED (INCH) ASTM F593

1/4-20 X 1 1/4 TAP BOLT 18-8 STAINLESS
Web Price $21.87
STAINLESS 18 8 HHCS, FULLY THREADED (INCH) ASTM F593

1/4-20 X 1 1/2 TAP BOLT 18-8 STAINLESS
Web Price $186.43
STAINLESS 18 8 HHCS, FULLY THREADED (INCH) ASTM F593

1/4-20 X 1 1/2 TAP BOLT 18-8 STAINLESS
Web Price $25.38
STAINLESS 18 8 HHCS, FULLY THREADED (INCH) ASTM F593

1/4-20 X 1 3/4 TAP BOLT 18-8 STAINLESS
Web Price $191.86
Diameter N/A 1/4
Pitch N/A Coarse
Length N/A 1 1/4 N/A 1 1/4 N/A 1 1/2 N/A 1 1/2 N/A 1 3/4
Material N/A 18-8 Stainless
Finish N/A Plain
Package Quantity N/A 1200 N/A 100 N/A 1000 N/A 100 N/A 900