Ask the Expert

Question: Is stacking of F436 washers acceptable with an A325 bolted connection ?  

Answer: Yes, in some cases the stacking of F436 washers seems to be allowed, but not in all cases.

 Read More...

Question: Do torque charts for tensioning fasteners apply to anchor bolts?

Answer: The AISC Steel Construction Manual, 13th Edition has this to say about anchor rod nut installation.

 Read More...

A common question that we get here at Portland Bolt is in regards to the shear strength of bolts. The shear strength is the value at which the lateral stress on a bolt or screw causes it to fail. It is an important factor to take into consideration when designing structural steel or timber connections. [...] Read More...

Question: How much thread engagement is recommended, i.e. how many threads should extend beyond the nut?

Answer: This is a difficult question to answer. Depending on your application, the answer could be anywhere from ¾ engagement, up to having two full threads extend beyond the nut. Look at these conflicting answers found in three separate technical publications. Read More...

Question: How much weight is gained from hot-dip galvanizing bolts?

Answer: According to the American Galvanizers Association (AGA) the weight of an item on average will increase about 3.5% from the zinc added during the galvanizing process. Read More...

A summary of corrosion resistant coating options for high strength bolts. Bolts with an ultimate tensile strength higher than 150 ksi can not be hot-dip galvanized. Here are some alternatives. Read More...

Question: Is there a standard thread length for bolts?

Answer: Depending on the type of bolt you are using the thread length can vary greatly. There is not an inclusive thread length standard that covers all fasteners. Depending on the applications, manufacturer, and a number of other factors the amount thread may change. Read More...

Tie rods, clevises, and turnbuckles are an important part of many architectural designs. Canopy supports, structural steel bracing, and walkway hangers are a few of the applications that use these assemblies. The unique configuration allows for field adjustments in both length and tension. Read More...

Per ASTM A325 section 6.3.1, the rotational capacity test is defined as a test, “that is intended to evaluate the presence of a lubricant, the efficiency of the lubricant, and the compatibility of assemblies as represented by the components selected for testing.”  Read More...

Every ASTM standard is identified by a unique designation. It includes a capital letter (A – H), followed by a serial number ranging from one to four digits, a dash, and finally the year of issue. Read More...