Changes
From Free Knowledge Base- The DUCK Project: information for everyone
The following lines were added (+) and removed (-):
Bolts (non-metric) and all fasteners are made to meet certain strength requirements and have a grade or ASTM rating. Special markings on screw heads and nuts identify the fastener's grade. Bolts and screws have a grade and manufacturer identification marking. Screws and bolts above 1/4" are typically marked on the top of their head unless Grade 2.