Midwest Hex Locknut, 3/8-16 Thread, Coarse Thread, Nylon Insert, Zinc Plated. Secure Locking Design: Built-in nylon collar prevents loosening caused by vibration, shock, or heavy loads Coarse Thread & Hexagonal Design: The heavier threading provides higher shear resistance for secure fastening in joints. Compatible with standard 9/16 wrench for easy installation. Premium Strength: Manufactured from hardened steel for superior durability and high-torque applications Corrosion Protection: The zinc plated yellow finish coating delivers corrosion resistance to rust and wear, ensuring long-lasting performance and a clean, bright appearance Versatile Use: Ideal for automotive, industrial, and heavy machinery projects requiring maximum fastening security Diameter: 3/8 Material: Steel Finish: Zinc Driver Type: 9/16 Wrench Thread Type: 16 (Coarse) UPC 014973284886 ASIN B00L1L7582 Brand Hard-to-Find Fastener Color Silver Model 014973284886 Set Name Set of 100 Size Name 1 Metal Type Alloy Steel Unit Count 100.0 Count Drive Style External Hex Item Weight 0.82 Kilograms Part Number LNS-311-100 Thread Size 3/8 -16 Thread Type Unified National Coarse Finish Types Zinc Grade Rating 2 Manufacturer Hard-to-Find Fastener Thread Class Class 2A Thread Style Nylon Insert Fastener Type Lock Item Diameter 0.38 Inches Material Type Alloy Steel Exterior Finish Zinc Item Dimensions 3.5 x 3.13 x 2.13 inches Number Of Items 100 Thread Coverage Fully Threaded Number of Pieces 100 Screw Head Style Nylon Insert Inside Thread Size 0.375 inch Maximum Shear Strength 350 MPa Compatible Groove Diameter 0.38 Inches