408 Piece Socket Cap Screw Assortment Starter Kit

When wrench clearance disappears — a die block seated inside a press, a hydraulic manifold tucked behind a panel, a machine cover that comes off every maintenance cycle — socket cap screws are the right call. This 408-piece assortment covers #10 through 1/2" UNC coarse thread in black oxide alloy steel, organized across a labeled 24-hole large metal drawer. What's Included Black oxide alloy steel socket head cap screws — #10-24 through 1/2"-13 UNC, multiple lengths per diameter 408 pieces total 24-hole large metal drawer — pre-labeled, one compartment per size and length combination Specifications Drive Hex socket (Allen/hex key) Thread standard UNC — Unified National Coarse Sizes #10-24, 1/4"-20, 5/16"-18, 3/8"-16, 1/2"-13 Finish Black oxide Material Alloy steel Total pieces 408 Storage 24-hole large metal drawer SKU ASST24SCS Best For Die and mold fixturing — socket heads clear tight counterbores and cavities where a hex head or wrench can't fit Machine part assembly — panels, covers, guards, and sub-assemblies accessed repeatedly with a hex key Confined-space fastening — anywhere a ratchet or open-end wrench can't swing freely Maintenance shops — a complete coarse-thread socket cap stock covering the five most common imperial sizes, organized and ready for daily use General industrial repair — a versatile starting inventory of the most commonly specified socket head cap screw sizes About Socket Cap Screws Socket head cap screws have a cylindrical head with a hex socket recess, driven by an Allen (hex) key. The head diameter is smaller than a standard hex head, which means they seat cleanly in counterbores and work in recesses where a wrench can never reach. The reduced-profile head also lets you pull parts tight against a mating surface without the head protruding past the joint. Alloy steel construction gives socket cap screws high tensile strength well above standard Grade 5 equivalents, making them the default choice for machine tooling, precision industrial fastening, and anywhere a compact high-strength fastener is specified. Black oxide finish provides light corrosion resistance and reduces galling in precision bored holes. UNC coarse thread is standard for general-purpose assembly — faster to run down than fine thread and more tolerant of minor contamination or thread damage. Shipping & Ordering Ships within 1–2 business days from our warehouse Volume pricing available — save up to 20% when ordering 3 or more kits B2B accounts: Fleet managers, facilities teams, and machine shops can apply for a business account with custom pricing and a dedicated rep — contact us to get started