Standard Screw Sizes - NeoSync.Net

Unified (UNC/UNF)

Metric

Machine Screws

Self-Tapping

Socket Head

Set Screws

Size	Diameter (in)	TPI	Head Diameter	Head Height	Hex Key	Common Uses

Size	Diameter (mm)	Pitch	Head Diameter	Head Height	Hex Key	Common Uses

Size	Diameter (in)	TPI	Head Type	Drive	Length Range	Applications

Size	Diameter (in)	TPI	Pilot Hole	Material	Head Type	Applications

Size	Diameter	TPI/Pitch	Head Diameter	Head Height	Hex Key Size	Strength Grade

Size	Diameter	TPI/Pitch	Point Type	Drive Type	Drive Size	Applications

UNC: Unified National Coarse - General purpose threading

UNF: Unified National Fine - Higher strength, better for thin materials

Machine Screws: Threaded fasteners under 1/4" diameter

Socket Head: High-strength cap screws with internal hex drive

Set Screws: Headless screws used to secure objects within or against another object

Grade Markings: Higher grade numbers indicate stronger materials