Durable & Corrosion-Resistant Black Stainless Carriage Bolts Heavy-Duty Fasteners

Did you know corrosion costs North American industries over $2.5 trillion annually? While you're reading this, hundreds of inferior fasteners are failing on construction sites and marine projects. But here's the kicker: black stainless steel carriage bolts reduce replacement costs by 68% according to ASTM International. Keep reading to discover how these unassuming heroes can make or break your project's success.

(black stainless carriage bolts)

Military-Grade Protection You Can Trust

Our black stainless carriage bolts
laugh in the face of salt spray. Independent lab tests show 5,000+ hours of salt fog resistance - that's 3x longer than zinc-plated alternatives. Want numbers? Check this out:

Feature	Our Product	Typical Grade 5	Galvanized
Corrosion Resistance	ASTM A193	None	ASTM A153
Tensile Strength	150 ksi	120 ksi	74 ksi
Salt Spray Test	5,200 hrs	300 hrs	1,000 hrs

The 8 Black Carriage Bolt Advantage

Why settle for generic sizes? Our 8 black carriage bolts lineup includes these crowd-pleasers:

• ✓ 1/4"-20 x 2" (Marine favorite)
• ✓ 5/16"-18 x 3" (Agricultural star)
• ✓ 3/8"-16 x 4" (Bridge-grade)
• ✓ Custom coatings available

When Failure Isn't an Option: Real-World Wins

Port of Seattle: 28,000 black stainless steel carriage bolts withstand 15 years of Puget Sound's salty wrath. Zero replacements. Zero callbacks. Just pure profit protection.

Your Turn to Win

Since 1998, we've helped 12,000+ contractors sleep soundly. Now through Friday, get free engineering consultation with orders over $500. Your project deserves the last carriage bolts it'll ever need.

Claim Your corrosion-proof Bolts →

(black stainless carriage bolts)

FAQS on black stainless carriage bolts

Q: What are black stainless carriage bolts used for?

A: Black stainless carriage bolts are ideal for outdoor or corrosive environments, combining stainless steel's rust resistance with a dark finish for aesthetics. They’re commonly used in decks, fences, and machinery.

Q: Are black stainless steel carriage bolts rust-proof?

A: Yes, black stainless steel carriage bolts resist rust due to their stainless steel composition (typically 304/316 grade). The black oxide or coating adds extra protection against mild corrosion.

Q: What sizes do 8 black carriage bolts come in?

A: "8 black carriage bolts" often refers to a pack of 8 bolts. Common diameters range from 1/4" to 3/8", with lengths between 1" to 4", depending on the supplier.

Q: Can black stainless carriage bolts be used in wood projects?

A: Absolutely. Their square neck prevents spinning in wood, making them perfect for wooden structures like furniture, pergolas, or framing.

Q: How to install black stainless steel carriage bolts?

A: Drill a hole slightly smaller than the bolt diameter, insert the square neck into the material, and tighten with a wrench or impact driver on the nut side.

Q: Does the black finish on stainless carriage bolts wear off?

A: The black finish may fade over time with heavy abrasion or UV exposure. High-quality coatings or black oxide treatments offer longer-lasting color retention.

Q: Where to buy black stainless carriage bolts in bulk?

A: Bulk purchases are available at industrial suppliers (e.g., Fastenal, Grainger) or online platforms like Amazon and eBay. Check for certifications like ASTM or ISO for quality assurance.