Hex Set Screws are fully threaded.
Hex Bolts have a partially threaded shank.
1/4 by 21/2 UNC Hex Bolt - Stainless
5/16 by 3/4 UNC Hex Set Screw - Stainless
5/16 by 3 UNC Hex Set Screw - Stainless
(Limited Stock at Present)