1/2"-13 x 4-1/2" Grade 8 Hex Bolts (4-Pack) with Flat Washers & Nylon Lock Nuts – SAE J429 Coarse Thread Heavy-Duty Bolts for Automotive, Machinery & Construction 4.5"
Product details
| Management number | 221096471 | Release Date | 2026/05/03 | List Price | US$9.90 | Model Number | 221096471 | ||
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These 1/2"-13 x 4-1/2" (4.5") long Grade 8 (G8) Bolts are engineered for applications where strength, reliability, and vibration resistance matter most. Each pack combines 4 high-strength Grade 8 (G8) hex bolts, 4 flat washers, and 4 nylon lock nuts. Designed for use in automotive repairs, trailer builds, agricultural equipment, shop machinery, and structural assemblies, this kit eliminates the need to source parts separately—saving time while ensuring proper fit and performance. Whether you’re a professional mechanic, fabricator, or serious DIYer, this fastener kit delivers the confidence of industrial-grade hardware in a convenient, ready-to-use package.
- Complete Bolt 4-packs: Includes 4 Grade 8 hex bolts, 4 hardened flat washers, 4 nylon lock nuts — everything you need for strong, vibration-resistant fastening in one convenient pack. Bolts 1/2" diameter x 4-1/2" long. Nuts and washers fit 1/2" bolts. Nylon rated for up to 250 degrees F. Bolts 150,000 psi min tensile strength.
- Grade 8 bolts and nuts deliver superior load capacity and shear strength. Bolts: Threads are made to the requirements of ASME B1.1. ASME B18.2.1 Dimensional Requirements. SAE J429 Material and Strength Level. ASTM A564 Material and Strength Level. ASTM F788 Surface Discontinuities. ASME B18.18 Inspection and Quality Assurance. Washers: SAE NT hardened RC 38-45, which is compatible with a Grade 8 fastening system. Nuts: Grade C Rc 24/32 SAE J995, compatible with Grade 8.
- Utimate Anti-Vibration Nylon Locking System: Washers help prevent loosening under torque, shock, and movement — perfect for equipment that sees constant vibration or cyclic loads.
- Precision-Matched Components: All fasteners are 1/2"-13 UNC for reliable fit and consistent clamping force across every assembly — no mismatched hardware, no guesswork.
- Built for Pros & Serious DIYers: Whether you’re repairing equipment, building fixtures, or assembling heavy components, this kit delivers industrial-grade reliability in a compact, easy-to-store format.
| Brand | Quantum Forge |
|---|---|
| Color | Yellow Zinc |
| Model | QFG35146-FBA |
| Set Name | Nylon Lock Nut + Washer |
| Head Type | Hex |
| Size Name | Nylon Lock Nut + Washer |
| Metal Type | Alloy Steel |
| Unit Count | 4.0 Count |
| Part Number | QFG35146-FBA |
| Thread Size | 1/2"-13 |
| Thread Type | Unc |
| Manufacturer | Quantum Forge |
| Thread Style | Right Hand |
| Fastener Size | 1/2"-13 |
| Fastener Type | Hexagon Bolt |
| Item Diameter | 0.38 Inches |
| Item Hardness | Grade 8 |
| Material Type | Alloy Steel |
| Exterior Finish | Yellow Zinc |
| Item Dimensions | 4.5 x 0.75 x 0.32 inches |
| Number Of Items | 4 |
| Thread Coverage | Partially Threaded |
| Number of Pieces | 4 |
| Screw Head Style | Hex |
| Manufacturer Grade | Grade 8 |
| Maximum Shear Strength | 150,000 psi min tensile |
| Compatible Groove Diameter | 0.5 Inches |
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