Greg's FAQs

ASTM A153

Does Portland Bolt sell hot-dip galvanized bolts that meet the A153 specification?

ASTM A153 is a broad specification covering zinc coating (hot-dip) of iron and steel hardware. In the past, A153 was the hot-dip galvanizing specification referenced by ASTM construction fasteners. The problem was that ASTM Committee F16 on Fasteners did not have any jurisdiction over this specification. Therefore, in 2005 the F2329 fastener-specific hot-dip galvanizing specification was established.... Read more

ASTM B633

Does Portland Bolt sell zinc plated bolts that meet the B633 specification?

ASTM B633 is a broad specification covering electrodeposited zinc coating applied to iron or steel. In the past, this was the zinc plating specification referenced by ASTM construction fasteners. The problem was that ASTM Committee F16 on Fasteners did not have any jurisdiction over this specification. Therefore, in 1998 the F1941 fastener-specific zinc plating specification was... Read more

Galvanizing A193 B7 Bolts

According to the information you give in your site, ASTM A193 Grade B7 can be galvanized. However, this material does not have a maximum tensile strength. Thus, it is possible to have ASTM A193 Grade B7 bolts with a tensile strength higher than 150 ksi and in this case, bolts should not be galvanized. What is your experience about this matter and how high can the tensile strength be in a current production?

The concern with galvanizing any high strength steel is the risk of hydrogen embrittlement. There is plenty of research on galvanizing high strength steels, but conclusions vary on the strength at which hydrogen embrittlement will likely occur when the parts are galvanized. Some research identifies 150 ksi tensile strength as a threshold, but other research... Read more

Stamped F1554 rods

Metric F1554

Does the ASTM F1554 specification allow metric sizes?

The ASTM F1554 specification does not prohibit or allow metric diameter F1554 anchor bolts.  It does not address the subject of metric dimensions at all.  So theoretically, if a manufacturer can locate metric steel round bar that meets both the chemical and mechanical requirements of the specification, metric F1554 anchor bolts can be provided.  Since... 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%. Therefore, any diameter of Grade 55 anchor rod... Read more

Domestic Washers

Are domestic flat washers a standard stock item?

Standard flat washers are a mass-produced item that Portland Bolt stocks as an accessory to accompany custom sized bolts we manufacture. A washer is a steel ring placed under a nut and/or bolt head to spread the pressure when the assembly is tightened. A washer also creates a smooth bearing surface for the nut to turn... Read more

SAE 4340 and ASTM F1554

Do bolts made from SAE 4340 material meet the requirements of ASTM F1554?

I have a client out of Israel and they manufacture equipment for use in power plants. They have a question about anchor bolts in seismic zones. They want to use anchor bolts made from SAE 4340 material and they would like to know if that is equivalent to ASTM F1554 material. Will this material be... Read more

Tap Bolt vs Cap Screw

What is the difference between a tap bolt and a cap screw?

A tap bolt is (typically) a fully threaded hex bolt, while a cap screw is (typically) a hex head bolt that will be installed by turning the head of the bolt (screw) instead of tightening it with a nut. Usually cap screws are being threaded into something (a piece of machinery for example), rather than... Read more

A320 Head Requirements

Does A320 require bolts or cap screws to have heavy hex heads?

Your page says A320 requires bolts or cap screws to have heavy hex heads. I have the 2003 edition of A320 and can’t find that requirement. Where is that requirement stated? The ASTM A320 specification does not specifically address the physical dimensions of headed bolts. However, it does refer you to ASTM A962 for some... Read more

High Strength Headed Bolts

Can I get Grade 8 heavy hex anchor bolts?

It not uncommon for us to get requests or for bolt configurations that don’t match the specifications. Anchor bolts called out as headed Grade 8 bolts are only available with a hex head. From your description ASTM A354 BD would be the correct fastener. This specification has mechanical properties that are very similar to SAE... Read more