Newest FAQs
The unthreaded portion of a headed bolt is called the grip. The length of all headed bolts (except countersunk head bolts) are measured from underneath the head to the end of the threads. The overall bolt length is made up of thread length plus grip length.
ASTM A193 Grades B8 and B8M Class 2 are grades of stainless steel bolts that are strain hardened and therefore have higher yield and tensile strengths than A193 Grades B8 and B8M Class 1 bolts. However, the ASTM A193 specification does not indicate a nut requirement used with Class 2 bolts, other than simply A194... Read more
There are many differences between these two specifications. In order to understand these dissimilarities there are overviews of each specification below followed by a short summary of these variances. For the purposes of this FAQ we will be focusing on A193 Grades B8 (Type 304) and B8M (Type 316) versus F593 Alloy Group 1 (Type... Read more
A wet storage stain is a white, rust-like surface discoloration that occurs from storing newly hot-dip galvanized materials. Wet storage stains occur when recently hot-dip galvanized materials are subjected to a moisture-rich environment and/or the materials are packed so closely together that there is not enough air movement and oxygen for the parts to “breathe”.... Read more
Unfortunately, Portland Bolt does not have any engineers on staff. For this reason and due to liability issues, we are unable to make recommendations with regard to quantity, size, configuration, or grades of fasteners for specific applications. By the time we get involved in manufacturing bolts for a construction project, an architect and engineer have... Read more
A jam nut is a thin nut primarily used as a locking device, run up against a full-height nut that has been tightened into place to prevent that primary nut from loosening. Jam nuts are not used as structural parts and are commonly not manufactured to meet any specific nut specification since their primary function... Read more
No. According to the specification, A563 Grade A hex nuts, sometimes referred to as finished hex nuts, stop at 1-1/2” diameter. A563 Grade A nuts are only available larger than 1-1/2” diameter in a heavy hex pattern. Portland Bolt stocks both import and domestic A563 Grade A standard hex and heavy hex nuts.
ASTM specifies the diameter range for F1554 grade 105 anchor bolts as ½” through 3”. What are the options for anchor bolts larger than 3” diameter of similar strength? Because the diameter range is clearly defined as ½” through 3” in the F1554 specification, an anchor bolt larger than 3” diameter can’t be certified to... Read more
To answer simply, as long as we possibly can. At the time of quoting, our pricing reflects the current costs for material and labor. With increases in cost, such as steel, always being a possibility, we can only guarantee pricing at the time of quoting. Our quotes include the following statement: “All quotations are for... Read more
The acronym CMTR stands for, “Certified Mill Test Report” or “Certified Material Test Reports.” As a manufacturer, it is imperative that we are using the correct raw material when manufacturing a given part, whether it is a bolt or fabricated steel plate. A CMTR is provided by the raw material producer (mill), which is a... Read more