Nate's FAQs


Clevis & Turnbuckle Grades

What grade are Portland Bolt’s Clevises and Turnbuckles?

For most tie rod assemblies that Portland Bolt provides, the clevises would be forged per ASTM A668 Class A, while the turnbuckles would be forged per ASTM A668 Class C. ASTM A668 is a general forging specification. An additional ASTM specification F1145 also covers turnbuckles specifically. If higher strength clevises are required to develop the strength... Read more

Shear Plate Dimensions

What are the physical dimensions of a shear plate?

The physical dimensions of shear plates are governed by ASTM D5933. Shear plates come in two sizes, 2-5/8” outside diameter and 4” outside diameter. In several cases, we have been asked the dimensions of everything other than the OD and bolt hole. All of those dimensions are listed in the diagrams below. If your project requires... Read more

Special A325 Bolts

Why are the heads of my A325 bolts marked with the letter “S”?

Under the new F3125 specification, which now governs A325 structural bolts, there is a supplementary requirement that allows A325 bolts to differ in head geometry and thread length (excluding fully threaded A325s) as required by the customer. When these alternate dimensions are required, the bolts shall be stamped “A325S”, with the “S” indicating special. Under the... Read more

Crane mat

Crane Mat Rods

Does Portland Bolt manufacture crane mat rods and bolts?

Yes, Portland Bolt manufactures crane mat rods. Crane mats (also known as timber mats, barge mats, road mats, swamp mats, pipeline mats, and floater mats) are wooden mats used for stabilizing machinery (often cranes) on unstable ground. They can also be used as a makeshift road, similar to a corduroy road. Crane mat rods are long threaded... Read more

B7 Length Tolerance

What is the length tolerance on ASTM A193 Grade B7 bolts?

The tolerances for A193-B7 are governed by section 4 of the specification, which states, “Material and fasteners supplied to this specification shall conform to the requirements of Specification A 962/A 962M. These requirements include test methods, finish, thread dimensions, marking, certification, optional supplementary requirements, and others.”   Studs (also known as All Thread Rods) would be... Read more

Grade 36 Weldability

Are F1554 grade 36 bolts always weldable?

F1554 Grade 36 bolts are considered weldable, and the current version of the specification specifically states this. Section 6.4 of the ASTM 1554-15 specification reads as follows: 6.4 Weldability — Grade 36 anchor bolts are considered weldable F1554 also allows for weldable Grade 55 to be substituted at the manufacturer’s discretion. The specification also notes... Read more

A36 Weldability

Is ASTM A36 steel round bar always weldable?

The ASTM A36 specification reads as follows: When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A6/A6M for information on weldability. Appendix X3 of ASTM A6/6M states: Weldability is a term that usually refers... Read more

A307 Weldability

Are ASTM A307 bolts and rods always weldable?

A307 bolts, rods, and studs are not always weldable.  For this grade to be weldable it must meet the supplementary requirement S1 of the ASTM A307 specification.  This supplement provides assurances of weldability by additional chemical composition restrictions and by a carbon equivalent formula.  In addition, “Because of the embrittling effects of welding temperatures on... Read more