Galvanized Roofing Screws
Galvanized Roofing Screws
Galvanized protection that doesn’t break the budget.
No red rust trails for five years or more.
Hot‑dipped for farms. Electro for dry sheds.
Sinsun Galvanized Roofing Screws: HDG & Electro‑Galvanized – Reliable Rust Protection Without the Stainless Price
Sinsun galvanized roofing screws – hot‑dipped (HDG) or electro‑galvanized. Self‑drilling, bonded EPDM washer. 500+ hrs salt spray. Factory direct.
Get a Quick QouteSinsun Galvanized Roofing Screws | Hot‑Dipped & Electro‑Galvanized Tek Screws
If you go to any roofing supply store, you'll see stacks of zinc roofing screws to the ceiling. But they won't tell you this: "Galvanized" refers to two very different types of coating. Electro-galvanized is a thin, shiny zinc layer that works well in dry places and for short periods of time. Hot-dipped zinc (HDG) is thick, dull gray, and lasts for decades outside. If you mix them up, you'll get rust streaks after two years. Sinsun makes both clear. The screws are also known as HDG Tek screws, zinc-plated roofing screws, or zinc-plated self-drivers (the spelling varies from market to market). We help you choose the right one, not sell you stainless steel when you don't need it.
What sets Shinsun apart from other bulk importers? We don't hide how thick the coating is. The minimum amount of zinc in each box of HDG screws is 2.5 mils (65 microns), which is what ASTM A153 says. We tell you electro-galvanized runs from 0.2 to 0.5 mils. Both come with our special bonded EPDM washer and heat-treated drill points. Many cheap zinc screws come with a washer that gets off before the screw screws in. Ours stays where it is. Sinsun zinc screws will protect your barn roof in Poland or shed roof in Brazil for a fair price.
| Coating Type | Size | Length (inches) | Drill Point | Head Style | Washer | Salt Spray (hrs) | Coating Thickness |
| Electro‑Galvanized | #12 – #14 | 1" – 2-1/2" | Point 3 / 4 | Hex Washer | Bonded EPDM | 150 – 200 | 0.2 – 0.5 mils |
| Hot‑Dipped (HDG) | #12 – #14 | 1" – 4" | Point 3 / 4 / 5 | Hex Washer | Bonded EPDM | 500 – 800 | 2.5 – 3.5 mils |
01
Base Material
Carbon steel (C1022)
02
Hardness (Core)
HRC 42-48
02
Drill Point Hardness
HRC 52-56 (separate heat treat)
Common Technical Parameters
03
Washer Material
Bonded EPDM (UV & temp stable)
04
Temperature Range
-40°C to 120°C
04
Recommended RPM
1,500 – 2,500
Primary Applications (Match Coating to Environment)
1. Agricultural Barns & Sheds – Choose HDG
The pollution caused by manure, high humidity, and rain occasionally. Electro-galvanized won't last here. Instead of steel, the thick sacrificial zinc layer on Sinsun HDG screws slowly rubs away. I saw them on dairy farms in southern Germany. Eight years later, the heads are still gray. No red rust. No problem with the washer. Pay an extra for HDG in any outdoor agricultural building.
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2. Industrial Warehouses & Factories – Electro is Often Enough
The only danger inside a dry warehouse is condensation, which can dampen things. That works fine with electro-galvanized screws. They look bright and clean, and they cost about 30% less than HDG. Electro-galvanized screws from Sinsun are used in places such as Vietnam and Poland for mezzanine floors, interior cladding, and storage buildings. Just don't let them get wet.
Contact us3. Residential Carports & Patio Covers – HDG Recommended
Rain from the wind can even reach a carport. People who own homes don't want orange streaks on their new patio. Sinsun HDG screws with heads that match the screw color (ask about our painted options) give you the look of a finished product and the strength of thick zinc. The bonded EPDM washer seals tightly against the sheet. A French roofer told me, "I used HDG on my own house." Not a single leak or rust spot in five years.
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4. Fencing & Rural Outbuildings – HDG for the Win
Tool sheds, barbed wire fences, and hay storage are all outside and often put up in remote areas where you don't want calls back. Contractors in South Africa and Eastern Europe use Sinsun HDG galvanized roofing screws often. They go fast, stay tight, and the zinc layer takes a long time to wear off.
Contact usReal Customer Feedback (Global Markets)
“We needed 15,000 screws for interior wall cladding – no rain, just humidity. Stainless would have been overkill. Sinsun electro‑galvanized screws did the job at half the cost. The EPDM washers are bonded tight. No spinning. Our crew installed 500 screws per hour. I’ll order again.”
“We have high summer rainfall and afternoon storms. Cheap galvanized screws from the co‑op rusted within a year. A builder friend gave me a box of Sinsun HDG. Two years later, only a few have light grey surface rust – no red bleeding. The washers are still flexible. I’m buying a pallet.”
Hot FAQs (From Real Search Queries)
Q1
Q: What’s the difference between electro‑galvanized and hot‑dipped galvanized roofing screws?
A: Electro‑galvanized is thin, bright, for dry areas. Hot‑dipped is thick, dull grey, for outdoors. Sinsun labels both clearly.
Q2
Q: How long do galvanized roofing screws last outdoors?
A: HDG typically 10‑15 years in moderate climates. Electro‑galvanized 2‑5 years outdoors. For salt air, step up to stainless.
Q3
Q: Can I use galvanized screws with treated lumber?
A: Yes for HDG. Avoid electro‑galvanized – the chemicals in treated wood accelerate corrosion. Use HDG or stainless.
Q4
Q: Why do my galvanized screws leave black streaks on the roof?
A: That’s zinc oxide wash – harmless but ugly. It happens with new HDG screws. It fades after a few rains. No structural issue.
Q5
Q: What’s the salt spray rating for Sinsun HDG screws?
A: 500+ hours (ASTM B117). That’s equivalent to 5‑10 years in a non‑coastal outdoor environment.
Q6
Q: Can I paint over galvanized roofing screws?
A: Yes, but clean the surface first. Sinsun offers pre‑painted HDG screws in black, green, grey, and red. Ask for the color chart.
From my experience, 80% of galvanized screw problems come from using electro‑galvanized where HDG was needed. Here’s how to decide:
Installation tip for HDG:The thicker zinc coating can make the screw feel slightly tighter. Don’t over‑torque. Set your impact driver to medium (around 1,800 RPM). The washer should seal but not bulge. Too tight crushes the EPDM and creates a leak path.
Storage note: Keep galvanized screws in their original box. Moisture in a humid shed can cause “white rust” – a powdery zinc oxide that doesn’t hurt strength but looks ugly. If you see it, wire brush and install anyway.
Need a sample box to test on your next barn or warehouse? Tell us your roof type, local climate, and whether the screw will see direct rain. We’ll recommend either HDG or electro‑galvanized – and ship samples within 48 hours. Click the inquiry button. No hard sell. Just honest fasteners.
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