Metal Thread Screws :- Pan & Countersunk Head Search for: Pan Head Metal Screws Pan Head Metal Screws Available in Imperial sizes from 1/8″ up to 3/8″. Metric sizes from M2 to M8 Countersunk Metal Thread Screws Countersunk Metal Thread Screws Available in Imperial 1/8″ to 3/8″ Metric M2 to M8 Mushroom Head / Tank Bolt Metal Thread Screws Mushroom Head Metal Thread Screws. Available in Imperial from 3/16″ to 5/16″. Metric M5 and M6