M8 (8mm inner diameter) T-nuts are a standard hardware component for building climbing walls, designed to provide a strong, secure, and reusable anchor point for bolt-on climbing holds. They are typically installed from the back of the plywood panel
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Key Features and Specifications
Thread Size: M8 (8mm inner diameter).
Material: Most are made from durable carbon steel, often with a zinc-plated or galvanized finish for corrosion resistance. Stainless steel options are available for outdoor or high-humidity environments.
Design: Commonly feature 4 prongs (claws) that bite into the wood to prevent spinning and loosening when a hold is attached or moved.
Installation: Designed to be inserted into a pre-drilled hole (typically 12mm or 1/2 inch in diameter) from the back of the climbing wall panel and tapped in with a hammer. Some professional/industrial models are "screw-in" types that include small screws for maximum stability and strength.
Panel Thickness: Best suited for 3/4" (18mm) plywood or thicker