Internally Threaded Concrete Anchors
Drop-in anchors are internally threaded concrete anchors, often installed overhead that run flush with the surface of concrete or stone. These anchors are often used to support handrails, lighting fixtures, piping, and more. They are for use in flush-mount applications in solid base materials. These kinds of female anchors are comprised of an internally threaded shell with an expansion cone insert. They require a setting tool for installation.
Drop-In anchors are often used with machine screws, cap screws, or threaded rod and are designed for concrete.
304 Stainless Steel:
(18% Chrome, 8% Nickel, .08% Maximum Carbon) – 18-8 Stainless refers to 300 series stainless steel. 303 and 304 Stainless are the most commonly listed grades, the standard grade for stainless steel fasteners. They are corrosion-resistant and durable. They are often used in marine applications in freshwater environments, but will not work as effectively in a salt water environment as 316 stainless. Stainless alloy resists oxidizing and rusting, however it can tarnish over time.
Zinc Plated Steel
Zinc plated steel is very common in the fastener industry. Zinc adds a layer of corrosion resistance to plain alloy steel. Clear zinc has a light, shiny color and blue zinc has a bright blue hue. Zinc plated steel is not suitable for extreme environment use, as it is not as resistant to corrosion as hot dipped galvanized.