Types of Bolts: Types, Components, and Fastener Terms
Screw Head Types Stock Illustrations – 43 Screw Head Types Stock Illustrations, Vectors & Clipart - Dreamstime
Machine-screws Manufacturer and Exporter - Definite Metal
What are screws heads, drives and threads? | Essentra Components UK
Common Fastener Heads For A Screw Or Bolt | CDE Fasteners, Inc.
Identification Charts for Different Types of FASTENER's - Head styles, Bolt and Screw, Drive, Washer and Nut types | Screws and bolts, Woodworking tips, Type chart