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1/2"-13 x 3-1/2" Grade 8 Hex Bolts (4-Pack) with Flat Washers & Nylon Lock Nuts – SAE J429 Coarse Thread Heavy-Duty Bolts for Automotive, Machinery & Construction 3.5"

View 1 of 1/2"-13 x 3-1/2" Grade 8 Hex Bolts (4-Pack) with Flat Washers & Nylon Lock Nuts – SAE J429 Coarse Thread Heavy-Duty Bolts for Automotive, Machinery & Construction 3.5"
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View 2 of 1/2"-13 x 3-1/2" Grade 8 Hex Bolts (4-Pack) with Flat Washers & Nylon Lock Nuts – SAE J429 Coarse Thread Heavy-Duty Bolts for Automotive, Machinery & Construction 3.5"
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Won For

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Description

These 1/2"-13 x 3-1/2" (3.5") 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.

Item Details

Seller

Nellis Auction

Pickup Location

5615 W Fuqua St BLDG D

Houston, TX, 77085

Quality

Used
Functional
No Damage
No Assembly Needed
In Package
No Missing Parts

Estimated Retail Price

$22.41

Buyers Premium

15%

Inventory Number

1074219914

Found in

Home Improvement

Additional Details from the Manufacturer

This item information is coming from the manufacturer. Some of the details may vary from the Nellis Auction listing. Please check the Quality Rating and Notes for information specific to this listing

brand

Quantum Forge

color

Yellow Zinc

dimensions

Item: 3.5 × 0.7 × 0.3 in · Package: 1.12 lb

More features

  • 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 3-1/2" 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.
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