I am your go-to source for sturdy fasteners. The {3/8 5 round head carriage bolt} is engineered for OEM assemblies and reliable performance in machinery, furniture, and structural projects. The round head provides a clean finish, while the square under-head shoulder prevents rotation during assembly. Made from high-strength carbon steel and zinc-plated for corrosion resistance, this bolt resists wear in both indoor and outdoor environments. It ships in standard quantities from my vetted suppliers, with consistent tolerances to reduce misfits on the line. Whether you are sourcing for OEM production or looking for dependable Suppliers, I can offer competitive pricing, short lead times, and packaging options to meet your process. I set up easy reorder, traceability, and quality checks to keep your line moving. Reach out and tell me your required length, coating, and quantity, and I’ll tailor an offer that fits your spec.
Global fastener procurement now hinges on service that meets innovation. The 3/8-inch round head carriage bolt remains a staple for timber connections and equipment enclosures, offering a precise diameter, a domed head, and a square undercut to resist turning. Buyers demand consistent material quality—carbon steel for general use, stainless or coated options for corrosive environments—and durable finishes, from zinc plating to hot-dip galvanizing, aligned to ANSI/ASME B18.2.0 and ISO specs. Leaders win through service and smart manufacturing: flexible lot sizes, rapid sampling, customized lengths or thread pitches, clear documentation, and reliable packaging. Automated inspection and traceability ensure 100% dimensional checks and material certs, while digital platforms provide real-time order status and transparent supply chains. For global buyers, the best partners combine design support with end-to-end delivery, turning a standard bolt into a strategic asset for projects across industries.
| Variant | Diameter (in) | Length (in) | Material | Finish | Tensile Strength (ksi) | Delivery Reliability (%) | Lead Time (days) | Patents (count) | Notes |
|---|---|---|---|---|---|---|---|---|---|
| V1-3/8x2 | 0.375 | 2 | AISI 1045 Carbon Steel | Zinc Plated | 70 | 98 | 3 | 12 | Standard grade, good for general purpose assembly |
| V2-3/8x3 | 0.375 | 3 | AISI 304 Stainless | Satin | 90 | 97 | 4 | 18 | Corrosion-resistant variant for indoor/outdoor use |
| V3-3/8x4 | 0.375 | 4 | AISI 316 Stainless | Passivated | 110 | 96 | 5 | 22 | Marine-grade, high corrosion resistance |
| V4-3/8x5 | 0.375 | 5 | Alloy Steel | Black Oxide | 120 | 95 | 6 | 8 | Heat-treated for increased strength |
| V5-3/8x6 | 0.375 | 6 | Carbon Steel | Zinc Plated | 75 | 94 | 7 | 5 | Long-length variant for extended grip |
| V6-3/8x2.5 | 0.375 | 2.5 | AISI 304 Stainless | Satin | 85 | 97 | 3 | 9 | Mid-range option with good corrosion resistance |
| V7-3/8x3.5 | 0.375 | 3.5 | Carbon Steel | Zinc Plated | 78 | 96 | 3 | 6 | Cost-effective for high-volume projects |
| V8-3/8x7 | 0.375 | 7 | Alloy Steel | Black Oxide | 130 | 92 | 8 | 14 | Heavy-duty variant for structural assemblies |