4-40 Precision Screws are engineered for makers who demand dependable strength, precise fitment, and professional-quality hardware for custom builds. Available in multiple head styles, thread lengths, drive types, and premium materials, these fasteners are ideal for custom knives, firearm accessories, holsters, sheaths, EDC gear, and other precision assembly projects.
Manufactured from high-quality stainless steel, these screws provide exceptional durability and corrosion resistance while maintaining the tight tolerances required for fine craftsmanship. Select models are made from DFARS-compliant 302HQ stainless steel and are proudly manufactured in the USA. Titanium versions are sold separately in the 4-40 Screws - Titanium group.
Choose from button head, flat head, or socket head designs to match your application. Torx drive models provide superior torque transfer with reduced risk of stripping, while Phillips drive options remain an excellent choice for traditional assemblies. Whether you need a low-profile button head, a flush-mount flat head, or a socket head for a secure recessed fit, this collection offers the precision hardware needed for professional results.
Designed for knife makers, gunsmiths, holster builders, and craftsmen who refuse to compromise on quality, these hard-to-find 4-40 precision screws deliver the performance, appearance, and reliability your projects deserve.
KK Swatch Size
large
Product Type:
Precision Screws
Thread Size:
4-40
Head Style:
Select from Options Above
Drive Type:
Select from Options Above (Torx T-8, Torx T-10, or Phillips)
Material:
Stainless Steel - DFARS Compliant
Head Diameter:
Select from Options Above
Thread Length:
Select from Options Above
Finish:
Select from Options Above (Natural Stainless or Black Oxide)
Quantity in Pack:
Select from Options Above (25 screws per package or sold individually)
Origin:
Made in the USA
