Jim's FAQs

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

Unified National Fine Thread Series (UNF)

Can Portland Bolt manufacture fasteners to Unified National Fine Thread Series (UNF)?

Unfortunately, Portland Bolt cannot manufacture fasteners with Unified National Fine threads. UNF thread series bolts are typically used in precision applications, such as automotive or machinery. Our threading equipment is unable to hold the required thread tolerance for UNF. Also, unlike cold-drawn steel, the hot rolled round bar we use to manufacture construction fasteners does not lend itself... Read more

A193 Grade B7 vs. SA193 Grade B7

What is the difference between A193 Grade B7 and SA193 Grade B7?

A193 is an ASTM (American Society for Testing and Materials) specification, whereas SA193 is from ASME (American Society of Mechanical Engineers). ASME repurposed the ASTM specification and added an “S”. The primary difference is the application.  While both specifications are designed for high temperature / high pressure service, SA193 may also be used in nuclear... Read more

A687 Fasteners

Can I order bolts to the ASTM A687 specification?

ASTM A687 was withdrawn in 1999. The specification covered high-strength non-headed steel bolts and studs.  Below are the mechanical properties as well as Charpy Testing requirements: Yield Strength (KSI) Tensile Strength (KSI) Elongation % Reduction of Area % Foot-Lbs (Ave-min) Temperature 105 Min. 150 Max. 15 Min. 45 Min. 15 -20F While it is possible... Read more

1/2″ A490 Bolts

Why can’t I find 1/2” diameter A490 bolts?

ASTM F3125 Grades A490 and A325 structural bolts are mass-produced through 1-1/4” diameter. However, there is an exception for 1/2” A490 bolts. Compared to other diameters, these are not commonly used. Therefore, 1/2” diameter A490 bolts are not mass-produced and are not readily available in the marketplace. There are a couple of ways to work around this. First,... Read more