Manufacturing FAQs

Headed Bolt Length

What is the longest headed bolt that Portland Bolt can manufacture?

Portland Bolt uses National Upsetters to hot-forge the heads onto bolts. The end of the round bar is heated using an induction process and placed horizontally into the upsetter where a plunger compresses the heated steel into the shape of the bolt head. Because this process is a horizontal forging process, Portland Bolt is only... Read more

Bolt Blanks

What is a Bolt Blank?

From time to time our friendly estimators may mention that we are going to make your order using bolt blanks.  But what is a bolt blank? In order to help facilitate small runs of custom bolts and rush orders, Portland Bolt stocks bolt blanks. Bolt blanks are headed bolts that have not been threaded yet.... 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

External Thread Summary

What is the meaning of thread pitch, major diameter, minor diameter, crest, root, flanks, angle, and run-out in the context of external thread?

Portland Bolt forms threads using two methods: cut threading and roll threading. Cut threading is a process that removes steel to form the threads. The roll threading method we utilize starts with reduced body pitch diameter steel. To make a one inch bolt we would use .912 inch round bar. This steel is forced between... Read more

Rolled Thread Bolt Diameter

Do Bolts with Rolled Threads have a Full Body Diameter or a Reduced Body Diameter?

When threading bolts, the two most commonly used methods are cut threading and roll threading. We are often asked if bolts which have been roll threaded have a full body diameter or a reduced body diameter. Depending on the type of fastener, the answer is both. When Portland Bolt produces bolts with rolled threads, we... Read more

Manufacturing Lead Times

What is "lead time"?

lead time  |  Noun /ˈliːdˌtaɪm/ The time between the initiation and completion of a production process. A common question our estimators field from prospective customers is, “What is your lead time?” Before we answer this question, let’s first address the term “lead time.” The dictionary defines a lead time as the time interval between the... Read more

End Types for Bolts and Rods

What end types are available for bolts and rods?

You can watch a video covering four of these point types: the chamfer, semi-cone, chisel, and 45-degree angle cut. Saw cut end When a large diameter or small quantity of bolts is required, Portland Bolt will saw cut the steel round bar to create the cut lengths for the finished fastener. A saw cut end... Read more

Oversizing Plate Holes

How large should I oversize my plate holes?

Square plates, rectangular plates, round plates, and templates are often required as part of an anchor bolt or fastener assembly. These plates serve as either large, oversized washers or anchor plates which are fastened to the bottom of anchor rods to provide pull-out resistance. Plates and washers are typically manufactured to ASTM A36, A572 grade 50,... Read more

Fastener Substitution Liability

What are the liability issues involved in substituting one fastener grade or configuration for another?

Have you ever had a fastener company try and talk you into substituting A193 grade B7 all thread rod for F1554 grade 55 anchor rods, claiming it’s “better?” Have you allowed them to substitute an all thread rod with a nut tack welded in lieu of a headed bolt? These are scenarios that come up... Read more

Headed Bolts vs Rod with a Nut

Can a rod with a welded nut be substituted for a bolt with a forged head?

When a rod with a nut is substituted for a bolt with a forged head, two issues come into play. In-house mechanical testing performed by Portland Bolt on headed bolts versus rods with a nut, both from the identical lots of steel, the rod with a nut developed up to 12% less strength than the... Read more