Kailey's FAQs

B7 Hex Head Bolt

B7 Bolts and DH Nuts

Can A563 Grade DH nuts be used with A193 Grade B7 bolts?

The short answer is no. The A193 specification is specifically designed for fasteners being used in high temperature, high pressure situations. In the ASTM specification, it states that the nuts shall conform to the A194 specification and it does not provide an alternate substitute. Though A563-DH and A194-2H are very similar, they are not interchangeable... Read more

B7 Hex Head Bolt

A193 Grade B7 Thread

Is the thread length of A193 Grade B7 bolts the same as A325 bolts?

In short, no, the thread length of A193 B7 bolts is not the same as the thread length of A325 bolts. The F3125 Grade A325 specification covers heavy hex structural bolts which have standard fixed thread lengths shown in the table below. The thread lengths can be altered, but A325 bolts with nonstandard thread lengths must... Read more

Large A193B8 Bolts

Are bolts ordered under the ASTM A193 Grade B8/B8M Class 2 specification available above 1-1/2” in diameter?

The short answer is no. The A193 specification does not cover bolts larger than 1-1/2” in diameter for Class 2 materials.  However, the reasoning behind this answer requires further explanation. Class 2 materials get their strength through the process of strain hardening (also known as work hardening or cold working). This process causes the grain structure... Read more

A325/A490 All-Thread

What is the all thread rod equivalent for A325 and A490?

In 2015, ASTM created a new, all-inclusive specification F3125 to cover A325 and A490 bolts under the same specification.  There were many changes made to the specification, but it is still not acceptable to manufacture fully threaded rods in the A325 or A490 specifications.  The new F3125 specification states in section 4.1.3: Bolts with thread... Read more

Conflict Mineral List Compliance

Is Portland Bolt in compliance with the Conflict Mineral List?

In order to answer this question, we must first define what conflict minerals are. Any natural resource that is mined in a conflict zone and sold to perpetuate fighting is defined as a conflict resource.  The conflict minerals that are most commonly extracted are cassiterite (used for tin), wolframite (used for tungsten), coltan (used for... Read more

“FOB”

What does the acronym “FOB” stand for and how does it affect your order?

According to the Incoterms 2010 standard which is published by the International Chamber of Commerce, the acronym “FOB” stands for “free on board.” In the US, this acronym “FOB” is commonly used when shipping goods to acknowledge who is responsible for the costs associated with loading, transporting and/or the point at which the ownership of... Read more

Fastener Standards Organizations

What standards organizations and specifying committees cover the types of bolts and fasteners Portland Bolt manufactures?

Portland Bolt manufactures a wide range of bolts and fasteners to numerous standards set by many different organizations and specifying committees. There are many different organizations for fasteners, all of which have their own set of standards and guidelines for manufacturing. We, as estimators, are often asked what the acronyms for such organizations and committees... Read more

A325 Countersunk Bolts

Can Portland Bolt manufacture A325 countersunk bolts?

The short answer is, yes! In 2015, ASTM created F3125 which is a new, all-inclusive specification for structural bolts that consolidated and replaced the following six stand-alone ASTM standards: A325, A325M, A490, A490M, F1852 and F2280. Under the new F3125 specification, A325 fasteners can be made in head styles other than heavy hex as long... Read more

Heavy Hex Nut

Internal Thread Corrosion

Since the threads inside of a hot-dip galvanized nut are bare metal, will they corrode?

The short answer to this question is no. However, there are many variables with regard to the protective coating that prevents the internal threads of a galvanized nut from corroding. In this FAQ, we will explore some of the variables brought about by this question. One of the first issues to address is the question... Read more

A193B7 Service Temperature

What is the maximum service temperature for A193 Grade B7 bolts?

Portland Bolt is often faced with this question, and because there are many conflicting sources online, we decided to do a little research on our own. The resource we found most helpful was ASME B31.1-2012. In this specification, there is a table which shows the maximum allowable stress values in Tension (KSI) for metal temperature.... Read more