3/8" x 4" Galvanized Carriage Bolts - Heavy-Duty Industrial Fasteners

Did you know 32% of industrial maintenance delays stem from subpar fasteners? When your machinery shakes loose or corrosion eats through bolts, productivity plummets. The right 3/8 inch x 4 inch carriage bolts could slash your downtime costs by $18,500 annually. Let’s explore how premium fasteners transform operations.

(3 8 inch x 4 inch carriage bolts)

Technical Superiority: Built for Maximum Load & Minimum Fuss

Our Grade 5 steel carriage bolts deliver 120,000 PSI tensile strength – 23% higher than industry average. The domed head design? It eliminates spinning during installation. Check these specs:

Size	Material	Load Capacity	Corrosion Resistance
3/8" x 4"	Grade 5 Steel	4,850 lbs	Zinc-Plated (150hrs salt spray)

Head-to-Head: Why Our Bolts Beat Competitors Cold

We tested 3/8 x 4 carriage bolts against 5 major brands. Results don’t lie:

• 🛡️ 2.3x longer thread engagement vs. Competitor A
• 🔩 304 stainless steel option available (competitors: 2 max)
• 📆 10-year rust warranty (industry average: 5 years)

Custom Solutions: Your Project, Perfected

Need 20-inch carriage bolts for bridge construction? 3 1/2 inch variants for agricultural equipment? Our engineers create tailored solutions in 72 hours flat. Over 87% of clients report perfect fit on first shipment.

Proven Results: Where Our Bolts Made History

Case Study: Midwest Wind Farms
After switching to our 3/8 x 4 carriage bolts:

• ⚡ 92% reduction in turbine vibration issues
• ⏱️ 650 saved maintenance hours annually
• 💰 $243K ROI in 18 months

(3 8 inch x 4 inch carriage bolts)

FAQS on 3 8 inch x 4 inch carriage bolts

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

A: These bolts are ideal for securing wood-to-wood connections, such as in door hinges, furniture assembly, or fence installations. Their smooth dome head and square neck prevent rotation during tightening.

Q: Are 3 1/2 inch carriage bolts available in corrosion-resistant materials?

A: Yes, 3 1/2 inch carriage bolts are often made from galvanized steel or stainless steel for outdoor or high-moisture environments. Always verify material specifications with the supplier before purchase.

Q: How do 20 inch carriage bolts differ from shorter sizes like 3/8 x 4 inch?

A: 20 inch carriage bolts are designed for heavy-duty structural projects like timber framing or securing large beams. Their extended length accommodates thicker materials compared to standard 3/8 x 4 inch bolts.

Q: Can I use 3/8 inch x 4 inch carriage bolts for automotive repairs?

A: While possible for non-critical parts, automotive applications typically require graded bolts. Opt for SAE or metric-rated alternatives unless the repair is temporary or low-stress.

Q: Do 3 1/2 inch and 20 inch carriage bolts have the same square neck design?

A: Yes, all carriage bolts feature a square neck under the head to lock into materials. The neck size scales with bolt diameter, not length, ensuring consistent anti-rotation performance across lengths.