Michael's FAQs

Heavy Square Head Bolts and Nuts

Are heavy square head bolts and heavy square nuts available?

According to ASME, a global standards organization which provides manufacturers with guidelines and tolerances for producing parts, there are no listed dimensions to manufacture heavy square head bolts. However, ASME does provide dimensions for heavy square nuts. ASME B18.2.1 This standard covers the dimensional requirements for nine product types of inch series bolts and screws... Read more

Large Diameter Anchor Rods

What ASTM specifications are available for anchor bolts with diameters larger than what is covered by ASTM F1554?

The ASTM F1554 specification for anchor bolts ranges from ½ – 4”Ø in Grade 36 and 55 and ½” – 3”Ø in Grade 105. Other material specifications are available for diameters larger than what is covered by F1554, but in some cases they are not technically fastener specifications. Grade Identification Size Inches 36 1⁄2 – 4 55... Read more

Returned Goods

I ordered fasteners from Portland Bolt that I no longer need. Does Portland Bolt accept returns?

Portland Bolt accepts returns on stock items that we inventory, with some exceptions and limitations. We are unable to accept returns on custom items that were manufactured per order. Exceptions for Returns on Portland Bolt Stock Items Portland Bolt is willing to accept returns on items that we inventory as long as the parts are... Read more

Certificate of Materials Origin (CMO)

Does Portland Bolt provide CMOs for state DOT projects?

Yes, Portland Bolt will provide CMO paperwork for DOT projects in the US. The purpose of a CMO is to document the origin of materials used on a construction project. A CMO is required under the Buy America Act and applies to all federally funded highway construction projects. A CMO is used to certify that all... Read more

Assembly

Does Portland Bolt assemble accessory hardware to bolts?

Unless instructed otherwise, Portland Bolt will ship nuts and washers unassembled from bolts, with a few exceptions: Tie Rod Assemblies Tie rod assemblies are commonly used in heavy timber construction and in erecting architectural and structural steel. The assemblies typically consist of a threaded rod with right hand thread on one end and left hand... Read more

F844 Plate Washers

Do Portland Bolt’s round plate washers meet the requirements of ASTM F844?

If a purchaser specifies an ASTM F844 washer with the dimensions of Portland Bolt’s plate washers, then the washers do meet the requirements of F844. According to ASTM F844, a specification for general use steel washers, the washer dimensions must conform to ASME B18.21.1, Type A, Tables 1A and Tables 1B, unless otherwise specified. The... Read more

Hex Nut

Hex vs. Heavy Hex Nuts

What is the difference between a standard hex nut and a heavy hex nut?

A standard hex nut, also referred to as a finished hex nut, has a smaller width across the flats and corners compared to a heavy hex nut, and a heavy hex nut is slightly thicker than a standard hex nut of the same nominal size. In fact, heavy hex nuts are exactly a 1/8” larger... Read more

Timber Bolt Head Nubs

I have to install timber bolts on a steel bearing surface. Am I able to order timber bolts without steel nubs underneath the heads?

Timber bolts, also referred to dome head bolts and as economy bolts in the Pacific Northwest, are designed with two nubs (or sometimes fins) on the underside of the head which bite into wood and prevent the head from spinning in the timber. The nubs under the head require a wood bearing surface to bite... Read more

Steel Racks

Steel vs. Fastener Specifications

Why is the steel on my mill test report a different specification than the bolts I ordered?

Steel is produced by rolling mills to specifications that cover steel shapes, plates, and bars.  Portland Bolt uses steel round bar to manufacture bolts to specifications that cover threaded fasteners. General steel specifications, such as ASTM A36 and A572 or AISI 1045 and 4140 are manufactured to specific chemical and (sometimes) mechanical requirements.  Heat analysis... Read more

Hex Lag Screw

Lag Screw vs Lag Bolt

What is the correct way to refer to a lag, screw or bolt?

Although these terms are used interchangeably, lags should be referred to as a screw and not as a bolt. A bolt is a fastener with machine thread that can accept a nut. A bolt is properly assembled and tightened by rotating the nut. A screw, on the other hand, is a fastener that is properly... Read more