Madden Bolt runs its own hot-dip galvanizing per ASTM A123, A153, F2329, and A767, coating every anchor bolt, steel embed, threaded rod, rebar cage, and fabricated part before it leaves the yard. Our kettle has sat on the same property as the fabrication shop since 2007. No outside galvanizer to schedule around, one QC team from raw steel to finished part, and the fastest galvanized-steel lead times you’ll find. Family-owned since 1988.
Hot-dip galvanizing starts with cleaning the steel, then lowering it into a kettle of molten zinc. The zinc bonds metallurgically to the surface and leaves a durable, sacrificial coating that protects the part for decades: a tough barrier layer, plus cathodic protection that keeps working even at scratches and cut edges. We galvanize anchor bolts, embeds, rebar, and fabricated steel in-house, on the same property the parts were fabricated on. The corrosion protection is built into the order instead of farmed out to an outside vendor.
Different parts call for different standards, and we match each item in an assembly to the right one:
| ASTM Standard | What It Covers | Typical Madden Bolt Parts |
|---|---|---|
| ASTM A123 | Zinc (hot-dip galvanized) coatings on iron and steel products | Embeds, sole plates, base plates, weldments, structural shapes |
| ASTM A153 | Zinc coating on iron and steel hardware (bolts, nuts, washers) | Anchor bolts, heavy hex nuts, washers |
| ASTM F2329 | Hot-dip zinc coating for steel bolts, nuts, washers, and threaded fasteners | Anchor bolts, nuts, washers, threaded rod |
| ASTM A767 | Zinc-coated (galvanized) steel bars for concrete reinforcement | Threaded rebar, rebar anchor cages, dual-thread bars |
When an assembly mixes part types, say a rebar cage carrying anchor bolts, it gets galvanized to both A767 and A153 on the same property, so the whole unit ships with one consistent, spec-correct coating.
Most fabricators ship steel out to a third-party galvanizer and wait for it to come back: freight both ways, plus whatever backlog that shop is working through. We got rid of that step in 2007 by putting our own kettle on the same property as the fabrication shop. The payoff stacks up:
Take the outside galvanizer out of the chain and the clock stops running on freight and someone else’s queue. That’s the single biggest reason our galvanized anchor bolt and structural steel lead times come in ahead of the pack.
With the kettle in-house, galvanizing goes into just about everything we make:
Galvanizing is the last step in a process we track end to end. We’re an AISC certified fabricator with a Certified Welding Inspector (CWI) on staff, and every coated order carries mill test reports (MTRs). One quality team signs off on every lot, from material receipt to final galvanizing. See our full quality and safety standards.
You clean the steel, then dunk it in a kettle of molten zinc. The zinc bonds metallurgically to the steel and forms a tough, sacrificial coating that holds up for decades, a barrier layer plus cathodic protection that keeps working even where the part gets scratched or cut. We galvanize anchor bolts, embeds, rebar, and fabricated steel right here, on the same property we fabricate them.
ASTM A123 for fabricated steel, A153 for bolts, nuts, and washers, and A767 for reinforcing bar. Each item in an assembly gets the standard that fits it, so a cage of galvanized rebar carrying galvanized anchor bolts meets both A767 and A153, coated on the same property.
Most fabricators truck their steel to an outside galvanizer and wait for it to come back, freight both ways, plus however long that shop’s queue runs. Our kettle has sat on the same property as the fabrication floor since 2007, so parts walk straight from fabrication to the zinc with no shipping and nobody else’s schedule to wait on. Cutting that one step out is the main reason our lead times beat everybody’s.
Anchor bolts and rods, steel embeds and embedded plates, threaded rebar and anchor cages, custom fabricated steel, pretty much everything we make. Since the kettle’s in-house, the coating’s part of the order, not something bolted on at the end.
It is. When the same shop and the same QC team handle both fabrication and coating, the zinc thickness holds steady lot to lot and one outfit owns the part from raw steel to finished, instead of a fabricator and a galvanizer pointing fingers at each other. For embeds and cages that get buried and never recoated, that consistency is the whole ballgame.
Yes. Anchor bolts and rods fabricated to ASTM F1554 are hot-dip galvanized per A153, with matching galvanized heavy hex nuts and washers supplied so the assembly threads and fits correctly after coating. We handle the coating allowance on threads as part of fabrication.
It’s not a separate request, send us your drawings and we build the galvanizing into the order. Request a quote online or call the Houston shop at 713.939.9999. Standard, rush, and expedited orders are all fine.
Send us your request for a quote with drawings when applicable, and we build the galvanizing right into the order. We run standard, rush, and expedited work, and we get it out the door fast.
