Newest FAQs

Cast-in-Place vs. Post-Installed Anchors

What is the difference between cast-in-place anchors and post-installed anchors?

Anchor bolts come in several different configurations, such as 90-degree bent, headed, rods with threads on each end, or fully threaded rods to name a few. Anchor bolts can be made in many grades. shapes and sizes, however, there are two distinct categories of anchor bolts: post-installed anchors and cast-in-place anchors. Although both types essentially... Read more

Rotational Capacity Tests

Which bolts require a rotational capacity test?

The rotational capacity test, sometimes referred to as a ROCAP test or RC test, serves as a quality control measure against excessively over-tapped nuts, a material with insufficient ductility, and generally assures that the assembly of elements (bolt, nut, and washer) will function together as a unit to achieve the required preloads. The test intends... Read more

Tie Rod Adjustability

How much adjustability does a tie rod assembly provide?

When Portland Bolt calculates the length of the rods in a tie rod using the pin-to-pin length of the assembly, we assume that the rods will be threaded into the clevises the full length of the female threaded nut component (Dimension ‘N’ in the drawing below) plus an additional length equal to ½” or half... Read more

ASTM vs SAE

What is the difference between ASTM and SAE Fastener Standards?

When looking at a bolt specification, you may notice that some are ASTM standards, such as ASTM F1554, and some are SAE standards, such as Grade 5 (a common bolt found within the SAE J429 specification). Outside the technical differences (mechanical requirements, chemical requirements, and other requirements) that vary between any fastener standard, the difference... Read more

Stainless Nuts and Galvanized Bolts

Can stainless steel nuts be used with galvanized bolts?

The use of stainless nuts with galvanized bolts is not advisable. Portland Bolt has fielded requests for galvanized bolts that have a stainless nut and washer as the hardware. Ideally, you would use a galvanized nuts and washers with a galvanized bolts and stainless bolts with stainless nuts and washers. Both types of nuts and... Read more

Intergranular Corrosion Test

What is an intergranular corrosion test?

In order to answer this question, we must first define what intergranular corrosion is. It is a type of corrosion where the grain boundaries of crystallites in austenitic steel are more susceptible to corrosion than the inside of the material. Grain boundaries can become depleted during the manufacturing of stainless steel round bar, the hot... Read more

SS304 or SS316 Bolts

Can I order bolts to Type 304 or 316 stainless steel?

Type 304 and Type 316 are very common stainless steel grades that just refer to a type of stainless steel. If you were to look for Type 304 or 316 stainless steel bolts in the ASTM Fastener Standards Manual you aren’t going to find them. That is because they are steel grades as opposed to... Read more

Black Bolt

9/16″ Structural Bolt Availability

Are 9/16” diameter F3125 Grades A325 and A490 structural bolts readily available?

No. The specification moves up in 1/8” increments starting at ½” diameter and maxing out at 1-1/2”. Under the old A325 – 09 specification, there was a reference about oversize limits on bolts and listed 9/16” diameter as a size. Since A325 bolts have been reclassified under the new F3125 specification, there is no longer... Read more

All Thread Rod in Tie Rod Assemblies

Can I use all thread rod for tie rod assemblies?

Yes and No. Traditionally, tie rod assemblies are used with thread each end rods and two clevises. They are designed to have a left-hand threaded end within the assembly in order to draw it tight. All thread rod possesses continuous right-hand thread from one end of the rod to the other. Here are the ways... Read more

Difference between F594 & A194 nuts

What is the difference between F594 and A194 nuts?

For this FAQ, we are focusing on the 304/316 alloys and their common, default strength conditions. Within both F594 and A194, there are many less common, exotic grades and multiple strength conditions. Exploring all possible permutations of all grades would be unnecessarily complicated. For more details, the actual ASTM standards can be purchased from ASTM,... Read more