100Pcs Button Head Socket Cap Screws M4-0.7X40Mm Alloy Steel Black

BUTTON HEAD SOCKET CAP SCREWS APPLICATIONButton Head Socket Cap Screws feature a low-profile, rounded dome head that provides a sleek and safe finish. Unlike flat heads, they sit above the surface without needing a countersunk hole, and offer a lower, smoother profile than socket head cap screws, making them for applications in fitness equipment, bicycles.ABOUT THIS BUTTON HEAD SCREWSUpgrading from black oxide to a zinc-nickel coating offers a leap in corrosion resistance. While black oxide provides minimal protection against rust, zinc-nickel can withstand over 400 hours in a neutral salt spray test, offering superior performance. Additionally, zinc-nickel boasts excellent heat resistance (withstanding over 200°C) and better abrasion resistance. This makes it a far more robust and durable choice for demanding applications in harsh environments.SPECIFICATION Color: Black Material: Alloy steel Finish: Zinc-nickel Thread Type: Coarse Thread Thread Dia.: M4 Thread Length: 40mm/1.57" Head Size: 7.6x2.2mm/0.3x0.09"(Dia.*T) Hexagon Width: 2.5mm / 0.1" Package Content: 100pcs x Button Head Hex Socket Screws (with a spanner) NOTE-Please refer to the image of SIZE and choose the Screws suitable for your project.