891Pcs Grade 8 Bolts and Nuts Kit, SAE Bolt Assortment Kit - size: 1/4-20, 5/16-18, 3/8-16, 1/2-13

About this item

• ✔️COMPLETE 891PC INDUSTRIAL KIT: Includes 212 Grade 8 hex bolts (1/4"-20, 5/16"-18, 3/8"-16, 1/2"-13), 225 nuts, 227 split lock washers, and 227 flat washers. Each bolt head features the official SAE Grade 8 six-line mark - your guarantee of true ASTM A574 strength.
• ✔️OEM-GRADE STRENGTH: Made from 40Cr & 10B33 alloy steel, heat-treated to Rockwell C33-39 (150,000 PSI tensile strength). Yellow zinc plating with 200+ hours salt spray protection - outperforms standard Grade 5 hardware by 50% in stress tests.
• ✔️HEAVY EQUIPMENT & FARM USE: Engineered for truck suspension, tractor implements, plow mounts, trailer hitches, and industrial machinery. Minimizes downtime with reliable fasteners that withstand extreme vibration and heavy loads.
• ✔️ PRO-GRADE STORAGE CASE: Sturdy compartment box with labeled slots and quick-reference card. Grab the right size in seconds - saves 15+ minutes per repair job. No more rummaging through rusty coffee cans.
• ✔️ COMMERCIAL-GRADE SUPPORT: This SAE kit is built for daily shop use and emergency field repairs. Note: SAE (Inch) sizes - NOT metric. For Japanese/European vehicles, see our metric listing. Contact us with any questions.

Overview

• Material: Alloy Steel(10B33 or 40Cr)
• Thread Size: 1/4"-20, 5/16"-18, 3/8"-16, 1/2"-13
• Exterior Finish: Yellow Zinc
• Manufacturer Grade: Grade 8
• Head Style: Hex