Technical FAQs

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

Ductile Steel

Are ASTM F1554 Grade 55 anchor rods > 2” in diameter a ‘ductile steel element’ per ACI 318-05 Appendix D.1?

According to ACI 318-05 Appendix D.1, a “Ductile Steel Element” is an element with a tensile test elongation of at least 14 percent and reduction in area of at least 30 percent. The minimum elongation percentage for any diameter of F1554 Grade 55 anchor rod is 21% and the minimum reduction of area percentage is... Read more

Clevis

Welding Clevises

Can I weld to a clevis?

Technically you should not weld to a clevis which is made of C1035 steel and has a carbon content of approximately 0.35%, too high to be normally considered a weldable material. If the engineer has required welding to the clevis, then a special welding procedure should be followed that is outlined in AWS D1.1 or... Read more

Torque for Stainless Steel

Why does Portland Bolt’s torque chart not have values for stainless steel fasteners?

Portland Bolt’s Torque Chart includes approximate torque values for fastener specifications made from carbon steel and alloy steel. We have chosen to exclude torque values related to fastener specification made from stainless steel. The primary reason we have decided to omit stainless fastener specifications from our torque chart is because we are unable to locate... Read more

A320 L7 Bolts in Slip Critical Connections

Can A320 L7 grade bolts be used for Slip Critical connections?

The grade of bolt used in a Slip Critical (SC) connection has no direct bearing on the connection itself, so the answer is yes. The SC connection means that it is a type of bolted structural steel connection which relies on friction between the two connected elements rather than bolt shear or bolt bearing to... Read more

Stainless Steel Fastener Magnetism

Are stainless steel fasteners magnetic?

A common misconception is that stainless steel is non-magnetic. There are five classes of stainless steel, and only one is non-magnetic. However, it just happens to be that the most widely used type (austenitic) is the one that is not magnetic. Class Magnetic? Common Types Ferritic Yes 430,442 Austenitic No 304,316 Martensitic Yes 410,416 Duplex... Read more

Heavy Hex Nut

Internal Thread Corrosion

Since the threads inside of a hot-dip galvanized nut are bare metal, will they corrode?

The short answer to this question is no. However, there are many variables with regard to the protective coating that prevents the internal threads of a galvanized nut from corroding. In this FAQ, we will explore some of the variables brought about by this question. One of the first issues to address is the question... Read more

Bolts Made from 44W Steel

Does Portland Bolt manufacture bolts from 44W steel?

Yes. 44W / 300W is the Canadian version of A36 steel, and is a grade within the CSA G40.21-04 specification. The Canadian Standards Association specification G40.21 covers structural quality steel plates, shapes, sheet, sheet piling, cold-formed channels, hollow sections, Z sections, and bars. 44W steel has slightly higher mechanical requirements than A36, which are summarized... Read more

Weldable F1554-55 Anchor Bolts

Are F1554 Grade 55 anchor bolts always weldable?

F1554 Grade 55 anchor bolts are not always weldable. The weldability of Grade 55 is a supplemental requirement referred to as “S1”, which must be specified. According to the ASTM F1554 specification under section S1.1, “This supplemental section, by chemical composition restrictions and by a carbon equivalent formula, provides assurance of weldability.” For F1554 Grade 55... Read more

A193B7 Service Temperature

What is the maximum service temperature for A193 Grade B7 bolts?

Portland Bolt is often faced with this question, and because there are many conflicting sources online, we decided to do a little research on our own. The resource we found most helpful was ASME B31.1-2012. In this specification, there is a table which shows the maximum allowable stress values in Tension (KSI) for metal temperature.... Read more