Newest FAQs

ASTM A193 vs ASTM F593

What are the differences between F593 and A193 stainless steel headed bolts?

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

Wet Storage Stains

What is a wet storage stain?

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

Engineers on Staff

Does Portland Bolt have any engineers on staff to help design my project?

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

Hex vs. Heavy Hex Jam Nuts

What is the difference between hex and heavy hex jam nuts?

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

Large Diameter A563-A Hex Nuts

Are A563 Grade A standard hex nuts available larger than 1½” diameter?

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.

Large Diameter ASTM F1554

Can F1554 Grade 105 Anchor Bolts Be Made Above 3” Diameter?

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

Pricing Validity

How long will Portland Bolt hold pricing?

To answer simply, as long as we possibly can.  At the time of quoting, our pricing reflects the current costs that we are faced with.  Technically, quoted prices are “for immediate acceptance.” With increases in cost, such as steel, always being a possibility, we can only guarantee pricing at the time of quoting.  This does... Read more

Certified Mill Test Reports

What is a “CMTR”?

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

ASTM A47 vs. A48 vs. A536

What is the difference between ASTM A47, A48, and A536?

ASTM A47, A48, and A536 are all casting specifications. Each grade has its own strength requirements and base material used. Each grade is also commonly associated with a particular finished part that Portland Bolt stocks. ASTM A47 ASTM A47 covers ferritic malleable castings intended for general use at temperatures from normal ambient to approximately 750°... Read more

Custom Packaging

Does Portland Bolt provide custom packaging?

Yes Portland Bolt offers custom packaging. Many of our light rail customers have us fully assemble the OCS foundation bolts marked with the foundation type. This allows them to simply drop the fully assembled bolts into their location. This also frees up their people from the task of field assembling product they may not be... Read more