Technical Information for Construction Fasteners
ASTM Specifications
Summaries of technical information on common ASTM Specifications used in the construction fastener industry.
FAQ | Ask the Expert
Portland Bolt FAQ section, with answers to frequently asked questions and an area to ask your own.
Strength Requirements
Information on the strength requirements of the different grades of construction fasteners.
Nut Compatibility Chart
Information on what grade and finish of nut is recommended or suitable for various ASTM specifications.
Thread Pitch Chart
Standard thread pitch explanations and a chart showing number of threads per inch for National Coarse, National Fine and 8 Pitch threads.
Fastener Identification
Information regarding the head markings on bolts manufactured by Portland Bolt. This is broken down by grade based on the specification of the fastener.
Lead Hole Diameters
Information regarding the lead hole diameter required for various sizes of lag bolts manufactured by Portland Bolt.
