ASTM FAQs

A490 vs F3125 Grade A490

What changes have occurred to the ASTM A490 specification since it was incorporated into the F3125 specification?

In December 2015, ASTM committee F16 approved the new F3125 standard, which combined six structural bolt standards, A325, A325M, A490, A490M, F1852, and F2280. The goal was to clean up inconsistencies within those various standards and combine them, so that future updates would be easier and less costly. The goal was not to drastically change... Read more

A325 vs F3125 Grade A325

What changes have occurred to the ASTM A325 specification since it was incorporated into the F3125 specification?

In December 2015, ASTM committee F16 approved the new F3125 standard, which combined six structural bolt standards, A325, A325M, A490, A490M, F1852, and F2280. The goal was to clean up inconsistencies within those various standards and combine them, so that future updates would be easier and less costly. The goal was not to drastically change... Read more

ASTM A153

Does Portland Bolt sell hot-dip galvanized bolts that meet the A153 specification?

ASTM A153 is a broad specification covering zinc coating (hot-dip) of iron and steel hardware. In the past, A153 was the hot-dip galvanizing specification referenced by ASTM construction fasteners. The problem was that ASTM Committee F16 on Fasteners did not have any jurisdiction over this specification. Therefore, in 2005 the F2329 fastener-specific hot-dip galvanizing specification was established.... Read more

ASTM B633

Does Portland Bolt sell zinc plated bolts that meet the B633 specification?

ASTM B633 is a broad specification covering electrodeposited zinc coating applied to iron or steel. In the past, this was the zinc plating specification referenced by ASTM construction fasteners. The problem was that ASTM Committee F16 on Fasteners did not have any jurisdiction over this specification. Therefore, in 1998 the F1941 fastener-specific zinc plating specification was... Read more

3/8″ Diameter F1554 Grade 36

Are 3/8” diameter F1554 Grade 36 anchor bolts available?

No they are not, although this is a somewhat recent change. In the 2015 version of the ASTM F1554 specification, the smallest diameter allowed was changed from ¼” to ½”. This means that prior to 2015, 3/8” diameter F1554 anchor bolts were allowable, but since then it is no longer an option. The F16 committee of... Read more

Specification Diameter Limits

Are there diameter limitations for various fastener specifications?

Every bolt grade has specific requirements including chemical makeup and strength properties. Virtually every grade of fastener also has diametrical limitations on both the small end and large end of sizes. For many grades the smallest diameter is ¼”, but some start at ½” (like ASTM F3125 and F1554). On the large end most bolts grades end... Read more

A193 Grade B8 vs. A320 Grade B8

What is the difference between A193 Grade B8 and A320 Grade B8?

The simple answer is none. The two specifications were written in tandem to be identical. The only difference between the two bolts is intended application. A193 bolts are intended for high temperature and high pressure applications, while A320 bolts are for cold temperature applications. Both bolt grades are made from type 304 stainless steel, have the same mechanical... Read more

Head Style Requirements

Do ASTM Grades Require a Specific Head Style?

When selecting an ASTM grade of fastener for a particular application, the chemical and mechanical requirements are normally considered first, but there are some fastener specifications that require a certain head style as well.  Below is a chart showing some common ASTM grades and whether or not they have requirements for the pattern of forged... Read more

F2329 Classes

Are there classes in the ASTM F2329 galvanizing specification similar to ASTM A153?

The A153 specification has 4 classes of material for hot-dip galvanizing: A. Castings – Malleable Iron, Steel B. Rolled, pressed, and forged articles C. Fasteners over 3/8” in diameter, washers 3/16” to 1/4” thickness D. Fasteners 3/8” inch in diameter and under, washers under 3/16” thick F2329 was created out of A153 to further define the... Read more

A325 Lag Screws

Can Portland Bolt manufacture A325 lag screws?

Even with the new F3125 specification that covers A325, Portland Bolt would not manufacture lag screws to F3125 Grade A325. According to section 1.2.1 under Intended Use in ASTM F3125, “Bolts manufactured under this specification are intended for use in structural connections covered in the Specification Joints Using High-Strength Bolts, as approved by the Research... Read more