SKU: CB316SS-516X8

5/16"-18 x 8" Conquest Carriage Bolt - 316 Stainless Steel

5/16"-18 x 8" Conquest Carriage Bolt - 316 Stainless Steel!

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Carriage Bolts

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Specifications

Diameter: 5/16"
Finish: Plain
Length: 8"
Material: 316 Stainless Steel
Head type: Round Head, Square Neck
Manufacturer name: Conquest Fasteners
Measuring system: Standard SAE
Quantity: 1
Thread length: 1-1/8"
Thread type: Coarse
Threads per inch: 18
Description

When corrosion isn't an option, 316 stainless steel is the answer. Conquest Carriage Bolts are designed for demanding environments, offering exceptional strength and resistance to rust, even in coastal, chemical, or high-moisture applications. Whether you're building a dock, assembling outdoor structures, or tackling marine or industrial work, these bolts hold tight and stay clean.

Each bolt features a smooth, rounded head that won’t snag or catch, paired with a square neck that locks into place when tightened through wood or metal. The result? A secure, low-profile finish that holds under pressure.

These bolts are available in a variety of lengths and diameters, giving you flexibility across a range of structural or aesthetic projects. From heavy-duty framing to exposed hardware accents, they’re as strong as they are reliable.

Key Features:

  • 316 Stainless Steel: Superior corrosion resistance in saltwater, outdoor, and chemical settings
  • Rounded Head Design: Clean, low-profile appearance with snag-free performance
  • Square Neck Under Head: Prevents spinning during installation; ideal for use in pre-drilled holes
  • Multiple Size Options: Suitable for structural, framing, marine, or general-purpose use
  • Durable Finish: Maintains clean look over time, even in harsh environments

Common Applications:

  • Outdoor framing & fencing
  • Decks, docks & boardwalks
  • Marine & saltwater environments
  • Machinery & industrial assemblies
  • Decorative hardware in timber framing

Installation:

  • Use in pre-drilled holes; the square neck grips into wood or metal to prevent spinning
  • Tighten with a nut and washer on the opposite side for a flush, secure hold
  • Compatible with power tools or hand tools

California Residents: WARNING

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Carriage Bolts

× WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects and other reproductive harm. For more information visit: www.P65Warnings.ca.gov.

Customer Reviews

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R
Robert Legeer Sr
Bolts for my truck restoration

I Google searched 5/16 x 8" bolt and they were in stock. I ordered 3 bolts and they came with nuts. Shipping was quick. Thanks.