HVAZI #4-40 UNC Stainless Steel Phillips Flat Head Machine Screws Nuts Kit

All-in-One 220PCS #4-40 UNC Phillips Flat-Head Machine-Screw & Hex-Nut Assortment:This kit consists of full-thread #4-40 UNC Phillips countersunk-head machine screws in 9 inch sizes plus matching hex nuts, total 220-pieces: - Screws: #4-40×3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 20pcs for each length - Hex Nuts: #4-40 UNC, 40pcs Screw length is measured from the top of the standard 82-degree countersunk flat-head. Ideal for electronic equipment, instrument installation, machinery maintenance and DIY-imperial-hardware replacement Corrosion-Resistant 304 Stainless-Steel Construction:All machine screws and hex nuts are made of solid 304 stainless-steel. It provides outstanding anti-oxidation and chemical-corrosion resistance and is mildly magnetic. Burr-free consistent full coarse-thread supports repeated disassembly, far more durable than carbon-steel fasteners in damp-indoor environments 82° Standard Countersunk Flat-Head Structure:Adopts industry-standard 82° chamfer-bevel under-head design. The screw sits fully flush within countersunk holes after tightening without protruding the surface. Standard Phillips cross-drive works with regular cross screwdrivers, preventing slipping while applying torque 40-TPI UNC Coarse Full-Thread Specification:Features #4-40 UNC 40-threads-per-inch standard coarse full thread. Thread-tooth precision is consistent, perfectly interlocked with matched #4-40 hex nuts. It delivers stable fastening force and effectively prevents loosening caused by slight vibration for circuit boards, small-machinery and fixtures ANSI-ASME B18.6.3 Industry Standard UNC Coarse Thread:Designed to meet ANSI B18.6.3F standards. Standard UNC coarse thread provides stable locking-force, resists loosening under minor vibration, perfectly fits tapped holes and matching imperial-hex nuts for equipment assembly and maintenance Compact See-Through Compartmentalised Plastic Storage Organizer:Equipped with lightweight transparent divided-plastic case. Screws and hex nuts are placed in independent separated compartments for quick identification. The compact-sized box is portable for electronic-repair workshops, laboratory work and home DIY-assembly projects