Bulk 1-3/8"-12 Socket Head Cap Screws – Fine Thread, Alloy Steel, Black Oxide – Monster Bolts Size_9/16"-12 These USS flat washers with

These USS flat washers with Zinc Yellow Cr+6 plating are perfect for use in construction projects

distributing load evenly while maintaining a smooth

and heavy machinery subjected to harsh conditions

Socket Cap Design: Cylindrical head style allows maximum clamping force in compact assemblies

Drive: 6-Lobe (Torx®) pan head delivers high torque with minimal cam-out

Bulk 1-3/8"-12 Socket Head Cap Screws – Fine Thread, Alloy Steel, Black Oxide – Monster Bolts Size_9/16"-12 These USS flat washers withMonster Overview: Fix your project right the first time with Bulk 1 3 8" 12 Socket Head Cap Screws from Monster Bolts. Precision made from high strength alloy steel and finished with a thermal black oxide coating, these fine thread (UNF) fasteners provide superior torque control, smooth threading, and consistent performance. Ideal for precision mechanical, structural, and industrial applications requiring high clamping force and alignment accuracy.