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Series 500 Metal Screws
Measure across the outside of the thread - not the shank - to get the gauge (a 10g screw measures about 4.8mm). Screw gauges have a wider tolerance than bolts, so treat it as a close match rather than exact. Then measure the length for your head type.
Every product page carries a Screw Gauge and TPI chart for its range - every gauge links straight to the product. For metal: coarse threads bite and hold thin sheet; fine threads (higher TPI) give more grip in thicker steel.
Series 500 metal screws carry a heavy-duty corrosion coating engineered for exposed, industrial and coastal steel fixing. The coating far outlasts standard zinc and Class 3 finishes in salt-laden and weather-exposed environments, while the self-drilling point fixes straight into steel without a pilot hole.
Also known as: Series 500 Self Drilling Screws, High-Durability Coated Metal Screws.
GRADES AND MATERIALS
Carbon steel with the Series 500 multi-layer corrosion coating - the choice when Class 3 is not enough but stainless is not required. Use for coastal cladding, exposed steelwork and industrial roofing.
DRIVE AND INSTALLATION
Driven to suit the head style supplied (hex nut setter or In-Hex). The self-drilling point cuts the steel as you drive - keep steady pressure so the point clears before the thread engages.
SIZE AND DRILL CAPACITY
Gauges and lengths with a tek point sized to the steel section. Match the drill-point capacity to the steel thickness and the length so the thread fully engages behind the sheet.
WHY AUSTRALIA TRUSTS BOLT & NUT
With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces - 98.75% of online orders placed before 1pm leave same day. Save more as you buy more - we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right Series 500 metal screw.
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Self-drilling metal screws with the Series 500 heavy-duty corrosion coating, engineered for exposed and coastal steel work where standard zinc and Class 3 finishes corrode too fast.
TECHNICAL RESOURCES
Drill capacity, drive size and gauge reference: Technical Resources. Choosing a finish? See our guide to choosing a screw coating, and match the size on our screw gauge sizing chart.
