Newest FAQs

Tie Rod Thread Lengths

How much thread length will I need on the tie rods I am ordering?

Unlike hex bolts, lag screws, and structural bolts, there is no standard thread length for tie rods.  A detailer or engineer may specify the thread length for tie rods, but it is not uncommon for the thread length to be left unspecified.  When thread lengths are not specified, Portland Bolt will determine the thread length... Read more

Common Anchor Rod Configurations

Anchor Rod Thread Length

How do I know how much thread length I need on my anchor rods?

There are no standard thread length calculations for anchor rods.  Anchor bolt thread length will depend on the required projection for the protruding end and the required hardware or configuration for the embedded end.  It is very common for structural drawings to detail the required thread lengths for anchor bolts. Bottom Threads Bottom threads will... Read more

Dimensional Standards

Which standard addresses dimensions for bolt head, nut, and washer sizes?

The organization that is responsible for addressing dimensional guidelines and tolerances for fasteners is the American Society of Mechanical Engineers (ASME). This organization was founded in 1880 and now has over 130,000 members in 151 countries. In addition to being a standards organization, ASME is also involved in research and development, training and professional development,... Read more

DFARS Compliance

What is DFARS compliant?

DFARS stands for Defense Federal Acquisition Regulation Supplement. This is a set of rules and restrictions that makes domestic or NATO materials preferred for United States defense contractors on military projects. A clause was added in 1973, amending the original regulation, currently allowing for materials to be melted in the following qualified countries per DFARS... Read more

Snug Tight

What would you regard as snug tight?

Snug tight is defined by the AISC/RCSC as when all the plies in a connection have been pulled into firm contact by the bolts in the joint, and the bolts have been tightened sufficiently to prevent removal of the nuts without a wrench. They go onto say that this is typically achieved by a few... Read more

Dimensioned Closed Eye Bolt

Bent Bolt Dimensions

What Dimensional Specification Covers Bent Bolts?

ASME, a global standards organization, provides dimensional guidelines and dimensional tolerances for a wide variety of fasteners and related items. Bent bolts, such as 90-degree bend anchor bolts, U-bolts, and eye bolts, fall under ASME B18.31.5. ASME B18.31.5 provides information regarding tolerances and quality, and their drawings also indicate where the bolts should be measured... Read more

Thread Angle

What is the thread angle degree requirement for threaded rods?

Per ASME B1.1, threaded rods should be made at a 60 degree top angle.  This is a standard that is produced throughout the United States, however, in recent years, Chinese manufacturers have figured out a way to save on steel costs by manufacturing threaded rods with 45 or 50 degree angles.  This material does not... Read more

Clevis Pin Options

What options are available for different configurations of clevis pins?

A tie rod assembly, used to brace steel columns, large timbers or canopies, often comes with clevises which are attached to mounting plates by a pin. These pins typically come in three configurations: headed pins with cotter, straight pins with cotters, and A325 structural bolts with a nut. Headed or ‘vertical’ pins possess a small... Read more

High Strength Square Nuts

Are high strength square nuts readily available?

Most square nuts in the marketplace are made from low or medium carbon steel and are typically used with square head bolts. Their strength is not compatible with high strength bolts.  These nuts are readily available in plain finish and hot-dip galvanized and are typically mass produced overseas. If you are looking for high strength... Read more

Measuring Thread Length

How does Portland Bolt measure thread length?

We run the nut onto the bolt until it stops, and we measure from end of inward face of the nut to end of bolt.  This does not include any thread runout which can range from ½” long for ¾” diameter and 1-1/4” long for 2-1/2” diameter and larger.