4.2×65-75 410 Phillips Bugle Head Coarse Thread Screw (Partial Thread)

Product Overview
This product is an extended self‑tapping screw made of 410 martensitic stainless steel, available in specifications 4.2×65 and 4.2×75 mm, with a pickled and passivated bright surface finish. It adopts a Phillips bugle countersunk head and a coarse partial‑thread structure, combining the aesthetic flush‑mounting advantage of drywall screws with the strong fastening capability of wood screws. Through heat treatment for enhanced hardness, its rust resistance and penetration performance are superior to ordinary carbon steel drywall screws, making it specifically designed for extended fastening of thick boards and double‑layer joists.

Product Applications
Home Renovation Projects: Extended fixing of double‑layer wood joists for ceilings, thickened partition wall joists, and gypsum board substrates.
Whole‑House Woodworking: Splicing of solid wood, plywood, eco‑boards, OSB thick panels, and assembly of cabinet frames.
Light Outdoor Woodwork: Installation of preservative‑treated timber on decks, garden wooden fences, etc., in dry environments.
Various thick composite panels and thickened substrates for wood veneer fixing.
Note: Not suitable for coastal high‑salt spray or long‑term water immersion in highly corrosive environments.