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Technical Information for Construction Fasteners

ASTM Specifications

ASTM Specifications

Summaries of technical information on common ASTM Specifications used in the construction fastener industry.

FAQ | Ask the Expert

FAQ | Ask the Expert

Portland Bolt FAQ section, with answers to frequently asked questions and an area to ask your own.

Bolt Torque Chart

Bolt Torque Chart

Torque values for various grades and diameters of fasteners.

Strength Requirements

Strength Requirements

Information on the strength requirements of the different grades of construction fasteners.

Nut Compatibility Chart

Nut Compatibility Chart

Information on what grade and finish of nut is recommended or suitable for various ASTM specifications.

Thread Pitch Chart

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.

Brinnell vs Rockwell

Steel Hardness Conversion Chart

Brinnell and Rockwell steel hardness equivalents.

Fastener Identification

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.

AASHTO to ASTM

AASHTO to ASTM

Simple AASHTO to ASTM conversions for common standards.

Lead Hole Diameters

Lead Hole Diameters

Information regarding the lead hole diameter required for various sizes of lag bolts manufactured by Portland Bolt.

Bolt Glossary

Bolt Glossary

A glossary of common terms used in the fastener industry.

Nut Weight Chart

Nut Weight Chart

A table of comparative weights for various sizes and grades of nuts.