Phillips B Self Tapping Countersunk Screws 

Phillips B Type Self Tapping Countersunk Screws are designed to cut their own threads within a pre-drilled hole. The countersunk head of this fastener allows it to sit flush with when used alongside a countersunk hole. The Phillips drive of this components makes it suitable for use with Accu's Phillips Drive Bits and Phillips Screwdrivers.

B Type Threads

B threads, previously known as type Z threads, are a variant of self-tapping threads with a tapered and and a blunt tip. This type of thread is generally used in conjunction with blind holes, or in applications where sharp components are unsuitable.