Will imported A307 grade A hex bolts meet the requirements of F1554 grade 36?
Anchor bolts which are embedded in concrete and used for structural anchorage purposes can assume several forms. Common forms of anchor bolts include right angle bend anchor bolts, swedged rods, and threaded rods (typically with a nut and/or square plate attached to the bottom of the rod). Another common configuration for an anchor bolt is a hex head bolt, where the head is inserted into the concrete slab as it is being poured, with the threads projecting from the concrete. The forged head prevents the hex bolt from pulling out of the foundation.
Almost all imported A307 grade A fasteners will not meet the F1554 grade 36 specification, although they are very similar. Many imported A307 grade A fasteners have no traceability and are only available with a certificate of conformance that contains no chemistry or mechanical property information. When mill test reports are present for imported A307 grade A hex bolts, they are often lacking data that will allow these bolts to be cross-certified to the F1554 grade 36 specification. The F1554 grade 36 specification requires that the bolts meet specific mechanical requirements including both tensile and yield strength. Since the A307 grade A specification does not possess a yield strength requirement, this value is rarely reported on the mill test reports. In order to cross-certify imported A307 grade A hex bolts to F1554 grade 36, yield strength testing must have been performed, the results must be included on the test reports, and the value must fall within the parameters of the F1554 grade 36 specification. Mild steel hex bolts are rarely, if ever, accompanied by test reports that verify all of the mechanical properties of the F1554 grade 36 specification will be met. Unless hex bolts are specifically manufactured and tested to the requirements of F1554 grade 36, they will undoubtedly not be accompanied by the correct certification documents with the additional requirements stated in the chart below.
Mechanical Properties: ASTM A307 grade A vs. F1554 Grade 36
|Grade||Tensile, ksi||Yield, ksi minimum|
|A307 Grade A||60 minimum||No requirement|
|F1554 Grade 36||58-80||36|
Take a look at the mill test reports for these ¾” x 18” imported hex bolts that are manufactured in China. These hex bolts are manufactured to meet the requirements of A307 grade A. As you can see, the tensile strength of the four samples ranges from 68 ksi – 74 ksi. These values exceed the minimum requirement for A307 grade A and fall between the range required by F1554 grade 36. However, these test reports do not show a yield strength value since a this test is not required for A307 grade A. Since this yield strength value is absent from the test reports and F1554 grade 36 requires it, this particular A307 grade A hex bolt cannot be cross-certified to F1554 grade 36.
Like many other fastener companies, Portland Bolt stocks imported A307 grade A hex bolts, and ours won’t meet the requirements of F1554 grade 36 either. However, we do manufacture F1554 grade 36 hex bolts and stock numerous commonly used sizes that are produced right here in our manufacturing facility in Portland, Oregon.
So what should you do if a fastener supplier tells you that they have hex bolts in stock that conform to the requirements of F1554 grade 36?
The first thing to do is question this claim. Although these specifications are similar, they are by no means the same. This is a vital issue since installing imported A307 grade A hex bolts instead of F1554 grade 36 hex bolt can present significant liability issues. By this same standard, we would caution you against allowing a fastener company to substitute a threaded rod with a nut for a true headed bolt. For more information on exposing your company to liability issues by installing the wrong product, read this FAQ.
Although these specifications are similar, they are by no means the same.
It is commonplace in our industry for a bolt supplier to substitute A307 grade A hex bolts when F1554 grade 36 hex bolts are required. Why is this done? There are many reasons ranging from a salesperson’s desire to close a sale and collect their commission with a similar product in stock, to simply not understanding the technical differences between the two specifications. Our suggestion would be to have a copy of the mill test reports sent to you prior to ordering the bolts. If your supplier indeed stocks F1554 grade 36 hex bolts, they will be able to supply you with documentation specifying the chemical and physical properties of the bolts you will be buying. Simply take the test reports and find the yield strength value. If it is missing, and this will likely be the case, the bolts will not meet the requirements of F1554 grade 36. Because the substitution of A307 grade A hex bolts for F1554 grade 36 hex bolts is so commonplace, it is up to you to protect your company from a potential law suit and verify for yourself that the “F1554 grade 36” hex bolts you are buying meet the requirements of the specification.
Portland Bolt employs a team of knowledgeable inside salespeople / estimators who will assist you with every aspect of the fastener purchasing process. We will ensure that you receive bolts that meet the requirements of the specification. Our salespeople are not paid on commission, and we work together as a team to service our customers and make sure you receive the product that was specified by the engineer. We will never substitute a product of a different grade or configuration in order to save a little time or a little money; that tactic would expose both your company, and Portland Bolt to a tremendous amount of liability. We are experts on construction fasteners. If you ever have a technical question or feel the need to verify information provided to you by another source, please give us a call.