Description
Engineered for robust performance in outdoor and structural applications, the A307 Grade A Steel Hot Dipped Galvanized Coarse Carriage Bolts 3/8-16 x 8 6 THD UNDER-SIZED deliver exceptional strength, corrosion resistance, and reliable fastening power. This hardware is ideal for wood-to-wood connections, decks, fences, and structural assemblies where long-lasting durability is required.
Key Features
- Material: A307 Grade A steel for dependable, long-term strength
- Finish: Hot-dipped galvanized coating for enhanced corrosion resistance in harsh environments
- Thread & Size: Coarse 3/8-16 UNC thread for quick, secure mating
- Length: 8 inches to handle deep wood connections
- Head Type: Carriage bolts with a square neck for secure seating in wood
- Special Note: 6 THD UNDER-SIZED
Why It’s Ideal
Hot-dipped galvanization protects the steel from moisture, humidity, and exposure to the elements, making these bolts suitable for outdoor projects and damp environments. The coarse thread provides strong bite in softwoods and composite materials, while the carriage bolt design ensures a flush, smooth finish once installed.
Applications
- Deck construction and repairs
- Fence installations
- Timber framing and structural connections
- Outdoor furniture and garden arbor projects
- General wood-to-wood fastening where durable, corrosion-resistant fasteners are required
Specifications
- Standard: A307 Grade A steel
- Finish: Hot-dipped galvanized
- Thread: Coarse 3/8-16 UNC
- Length: 8 in
- Head: Carriage bolt with square neck
- Diameter: 3/8 in
- THD: 6 THD (UNDER-SIZED)
Can We Help?
If you’re not sure that this product is right for you, give us a call!
800-222-0324

