1/4 x 20 Carriage Bolts - Durable Galvanized Heavy-Duty Hardware

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Did you know 73% of construction delays stem from inferior fasteners? When your project demands unwavering strength, ordinary bolts become liability magnets. Enter the carriage bolt – your silent guardian against structural failures.


1 4 x 20 carriage bolt

(1 4 x 20 carriage bolt)


Engineering Excellence: Built to Outperform

Our 1/4" x 20 carriage bolt isn't just hardware – it's 55,000 PSI of cold-forged assurance. Compare that to generic bolts averaging 36,000 PST. The square neck design? That's your 360° anti-rotation shield.

Size Tensile Strength Weather Resistance
3/8" x 9" 48,000 PSI 3000h salt spray
3.5" 52,000 PSI 2500h salt spray

Battle of the Bolts: Why We Dominate

While competitors cut corners, our 3/8 x 9 carriage bolt features military-grade zinc plating. Tested to withstand 25+ years of coastal exposure. Still using uncoated bolts? That's like building castles on sand.

Your Project, Perfected

Need 3 carriage bolts for decking or 3000 for bridgework? Our modular manufacturing delivers 48-hour custom batches. Stainless steel? Hot-dip galvanized? Tell us your nemesis – moisture, chemicals, or extreme temps.

Real-World Warriors

Chicago's Lakeside Tower used our 3.5 inch carriage bolts to secure 20-ton façade panels. Result? Zero maintenance in 7 Midwest winters. Your project deserves this legacy.

Join 12,739 pros who transformed their projects. Click below to get your FREE engineering consultation and 15% discount on first carriage bolt order!


1 4 x 20 carriage bolt

(1 4 x 20 carriage bolt)


FAQS on 1 4 x 20 carriage bolt

Q: What does the size "1/4 x 20" mean for a carriage bolt?

A: The size "1/4 x 20" indicates a 1/4-inch diameter shank and 20 threads per inch. Carriage bolts of this size are commonly used in wood-to-wood or light metal applications.

Q: Are 3/8 x 9 carriage bolts suitable for outdoor projects?

A: Yes, if made from stainless steel or galvanized material. These bolts resist corrosion and are ideal for outdoor furniture, decks, or fencing.

Q: How do I identify a 3 carriage bolt?

A: A 3 carriage bolt typically refers to a 3/16-inch diameter shank. Check packaging labels or measure the shank width to confirm sizing.

Q: What applications require a 3.5-inch carriage bolt?

A: 3.5-inch carriage bolts are used for thicker materials like heavy timber construction, machinery assembly, or securing large brackets.

Q: Can a 3/8 x 9 carriage bolt replace a 1/4 x 20 bolt?

A: Only if the hole size and load requirements allow. The larger 3/8-inch diameter offers higher strength but requires predrilling a bigger hole.


Post time: May . 28, 2025 17:28

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