Technical Information for Construction Fasteners
Summaries of technical information on common ASTM Specifications used in the construction fastener industry.
Portland Bolt FAQ section, with answers to frequently asked questions and an area to ask your own.
Torque values for various grades and diameters of fasteners.
Information on the strength requirements of the different grades of construction fasteners.
Information on what grade and finish of nut is recommended or suitable for various ASTM specifications.
Standard thread pitch explanations and a chart showing number of threads per inch for National Coarse, National Fine and 8 Pitch threads.
A table of comparative weights for various sizes and grades of nuts.
Information regarding the head markings on bolts manufactured by Portland Bolt. This is broken down by grade based on the specification of the fastener.
Simple AASHTO to ASTM conversions for common standards.
Information regarding the lead hole diameter required for various sizes of lag bolts manufactured by Portland Bolt.
A glossary of common terms used in the fastener industry.