1/2"-13 x 1-1/2" Grade 8 Flange Bolts (25-Pack) – Heavy-Duty Hex Flange Bolts Includes All-Metal Lock Nuts – High-Strength SAE J429/J995 Anti-Vibration 1.5" Coarse Thread, Prevailing Torque
Product details
| Management number | 211256799 | Release Date | 2026/04/04 | List Price | $19.98 | Model Number | 211256799 | ||
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These 1/2"-13 x 1-1/2" (1.5") long Grade 8 (G8) Flange Bolts are engineered for applications where strength, reliability, and vibration resistance matter most. Each pack combines a high-strength Grade 8 (G8) flange bolt, a matching Grade C all-metal prevailing torque lock nut. 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 25-packs: Includes 25 Grade 8 flange bolts, 25 Grade C all-metal prevailing torque lock nuts— everything you need for strong, vibration-resistant fastening in one convenient pack. Bolts 1/2" x 1-1/2" long. Nuts fit 1/2" bolts. Grade C nuts compatible with Grade 8 bolts.
- Grade 8 Strength for Demanding Jobs: High-tensile SAE J429 Grade 8 bolts deliver superior load capacity and shear strength. Bolts are: IFI-111 Dimensional Requirements. ASME B18.6.3 Dimensional Requirements for Machine Screws. SAE J429 Material and Strength Level. ASME B1.1 Thread Requirements. ASTM F788 Surface Discontinuities. ASME B18.18 Inspection and Quality Assurance. Unified Threads (UNC and UNF) Class 2A. Thread acceptance per ASME B1.3, System 21. Hardness HRC 33/39. All-metal lock nuts are: IFI 100/107 for Grade C which is designed to be used on fasteners up to a Grade 8 strength level. Proof load strength 150,000 psi. Hardness Rc 24/32.
- High-Strength Flange Bolt, Locking Nut – The Grade 8 bolt provides the primary load-bearing strength, while the Grade C nut delivers secure retention and resistance to loosening.
- 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 delivers industrial-grade reliability in a compact, easy-to-store format.
| Brand | Quantum Forge |
|---|---|
| Color | Yellow Zinc |
| Model | QFG35045-FBA |
| Set Name | Grade 8 Flange Bolt Kit (25 Piece) |
| Head Type | Hex |
| Size Name | 1/2" x 1-1/2" Bolt and Nut |
| Metal Type | Alloy Steel |
| Unit Count | 25.0 Count |
| Part Number | QFG35045-FBA |
| Thread Size | 1/2"-13 |
| Thread Type | Unc |
| Finish Types | Glossy |
| Manufacturer | Quantum Forge |
| Thread Class | 2A |
| Thread Style | Right Hand |
| Fastener Size | 1/2"-13 |
| Fastener Type | Flange Bolt |
| Item Diameter | 0.38 Inches |
| Item Hardness | Grade 8 |
| Material Type | Alloy Steel |
| Exterior Finish | Yellow Zinc |
| Item Dimensions | 1.5 x 1.07 x 0.51 inches |
| Thread Coverage | Fully Threaded |
| Number of Pieces | 25 |
| Screw Head Style | Hex Flange |
| Screw Point Style | Flat Point |
| Manufacturer Grade | Grade 8 |
| Maximum Shear Strength | 150,000 psi min tensile |
| Compatible Groove Diameter | 0.5 Inches |
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