3/8" Carriage Bolts Durable Zinc-Plated & Multiple Sizes

Did you know 42% of equipment failures stem from substandard fasteners? Picture this: Your machinery shakes violently under load. A critical joint fails. Production halts. You lose $8,500/hour. All because you chose generic bolts. Now imagine a solution that slashes failure rates by 67%...

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Technical Superiority: What Makes Our 3/8 x 4" Carriage Bolts Unbeatable

Our 3/8 x 4 inch carriage bolts aren't just hardware—they're engineered perfection. Hot-dip galvanized to 85µm thickness (3x industry standard). Quadruple-thread engagement for vibration resistance. ASTM F3125 Grade A4 compliance. You get 182,000 PSI tensile strength—enough to lift 2 SUVs simultaneously.

Head-to-Head: 3/8 x 3.5 Carriage Bolts Comparison

Feature	Our Product	Competitor A	Competitor B
Corrosion Resistance	1,500hr salt spray	480hr	320hr
Shear Strength	24,500 lbs	18,300 lbs	15,800 lbs
Price/100pc	$89.99	$72.50	$68.90

Custom Solutions: From 3/8 x 3.5" to 4" Galvanized Carriage Bolts

Need 3/8 x 3.5 galvanized carriage bolts for marine environments? Or 4" versions for heavy timber construction? Our modular manufacturing system delivers custom batches in 72hrs. Choose from 18 coating options, 7 head styles, and 4 thread types.

Proven Performance: Where Our Bolts Excel

→ Agricultural Machinery: Reduced fastener replacements by 89% at John Deere Midwest
→ Bridge Construction: 100% USDA compliance in NYC infrastructure projects
→ Solar Farms: Zero failures in 120mph winds at Texas Solar Ranch

Your Move: Industrial-Grade Fasteners or Costly Downtime?

Since 1987, BoltMaster Industries has delivered 23 million carriage bolts across 14 industries. Our ISO 9001-certified plant guarantees 99.98% defect-free products. Why gamble with your projects? Click below to get your 3/8 x 4 inch carriage bolts sample kit with lifetime technical support—FREE shipping for first-time buyers!

Get Industrial-Strength Bolts Now →

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FAQS on carriage bolts 3

Q: What are the typical applications for 3/8 x 4 inch carriage bolts?

A: 3/8 x 4-inch carriage bolts are ideal for heavy-duty wood-to-wood or metal-to-wood connections, such as deck construction, fencing, or structural framing. Their square neck prevents spinning during installation. The 4-inch length provides ample threading for secure fastening.

Q: Can 3/8 x 3.5-inch carriage bolts be used for automotive repairs?

A: Yes, 3/8 x 3.5-inch carriage bolts work well for non-critical automotive components like trailer hitches or chassis parts. Ensure the bolt length matches the material thickness. Always verify load capacity requirements for safety-sensitive applications.

Q: Are 3/8 x 3.5 galvanized carriage bolts rust-resistant?

A: Yes, 3/8 x 3.5 galvanized carriage bolts feature zinc coating for corrosion resistance, making them suitable for outdoor or humid environments. Avoid using them in coastal areas without additional protection. Regular inspection is recommended for long-term durability.

Q: What type of washers pair best with 3/8-inch carriage bolts?

A: Use SAE flat washers or lock washers sized for 3/8-inch bolts. For galvanized variants, match with zinc-plated washers to maintain corrosion resistance. Nylon-insert lock nuts can enhance vibration resistance in dynamic applications.

Q: How does the strength of 3/8 x 3.5 galvanized bolts compare to non-coated versions?

A: Galvanized 3/8 x 3.5 carriage bolts maintain similar tensile strength to uncoated bolts (typically Grade 2 or 5). The zinc coating adds minimal thickness but doesn't compromise structural integrity. Always check manufacturer specifications for exact load ratings.