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Archive for the ‘Galvanizing Bolts’ Category

Galvanizing F1554 Anchor Bolts

Friday, March 14th, 2014
Question: In a recent Portland Bolt live chat we were asked, “Can all three grades of F1554 anchor bolts be galvanized?”

Answer: The answer to this question is yes! All three grades within the ASTM F1554 specification, Grade 36, Grade 55, and Grade 105, can be either hot-dip galvanized or mechanically galvanized.  Read More...

Mechanically Galvanizing Long Fasteners

Friday, March 22nd, 2013
Question: Can I mechanically galvanize fasteners that are very long in length?

Answer: Mechanical galvanizing (ASTM B695) is a process in which fasteners are tumbled in a barrel with a mixture of water, zinc powder, other chemicals, and glass impact beads. Read More...

Hot-Dip Galvanizing vs Electrogalvanizing (Zinc Plating)

Wednesday, June 27th, 2012
Question: How does hot-dip galvanizing differ from electrogalvanizing?

Answer: Hot-dip galvanizing is a process of applying a protective zinc coating by dipping product in bath of molten zinc. Read More...

Mixing Galvanized Nuts and Black Bolts

Tuesday, February 14th, 2012
Question: Can I use a hot-dip galvanized nut on a plain finish bolt?

Answer: Hot-dip galvanized nuts cannot be used on a plain finish bolt.

 Read More...

Galvanizing High Strength Bolts

Monday, October 24th, 2011
Question: Can high strength bolts be hot-dip galvanized?

Answer: Some high strength bolts can be galvanized while others cannot. Read More...

Galvanizing Bolts for Pressure Treated Wood

Monday, July 19th, 2010
Question: Are current ASTM galvanizing standards suitable for use with the new chemicals being used in pressure treated wood? Some people have told me I need to use double or triple dipped fasteners. Is this true?

Answer: Since the new chemicals (alkaline copper quat [ACQ], copper azole [CBA-A and CA-B], and sodium borates [SBX]) now being used in pressure treated wood have been shown to be up to two or three times more corrosive then the previously used chromate copper arsenate (CCA), the recommended galvanizing thickness for materials being used with the new pressure treated wood was increased from about 0.75 to 1.56 mils thick. Read More...

Galvanized Bolts and Chased Threads

Sunday, January 10th, 2010
Question: Can threads be chased after hot-dip galvanizing for proper nut fit? Answer: Absolutely not! Externally threaded fasteners should never be “chased”. During the hot-dip galvanizing process, excess zinc has a tendency to build up in the threaded portion of a fastener. Chasing threads is a term used to describe re-cutting threads after galvanizing to remove this excess zinc gained during the galvanizing process. Chasing threads will not only remove the excess zinc, but often remove much, if not all of zinc coating and eliminates the corrosion protection on the threaded portion of the fastener. Read More...

Weight Gained from Galvanizing

Wednesday, May 13th, 2009
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...

Coating Options for High Strength Bolts

Friday, April 3rd, 2009
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...

Galvanized Nuts Tapped Oversize

Tuesday, July 3rd, 2007
Can zinc plated nuts be used on hot-dip galvanized rods? Read More...


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