5/16" x 2-1/2"Hot Dip Galvanized Grade 307A Carriage Bolt Kit, 50 Pack, Comes with 5/16" USS Flat Washers & 5/16"-18 Hex Nuts, Heavy Duty Exterior Construction Use
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- Multiple Size Options: Available in 5/16"×1", 1-1/2", 2", 2-1/2", and 3" lengths to fit various wood thicknesses, ideal for decks, fences, gazebos, pergolas, and all outdoor projects.
- Complete All-In-One Kit: Each set includes carriage bolts, thick washers, and hex nuts. No extra parts needed, ready to use right out of the box.
- Long-Lasting Rust & Corrosion Resistance: Hot dip galvanized finish offers excellent weather and corrosion resistance, works with ACQ treated lumber, perfect for all outdoor conditions.
- Smooth, Clean Flush Finish: Flat head design creates a semi-flush surface with no sharp edges, keeping your projects neat, safe, and visually appealing.
- Secure, Anti-Slip Installation: Square neck prevents spinning during installation; coarse UNC threads provide strong grip to avoid stripping or loosening over time.
- Quality Meets Industrial Standards: Complies with ASME and ASTM specifications, durable enough for heavy-duty outdoor use.
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Estimated shipping
Select a product to estimate shipping.These heavy-duty carriage bolt kits from Zivovoy are built for lasting strength and reliability in outdoor projects. This kit provides everything you need to securely fasten wood and other materials, offering a durable and professional finish.
Key Highlights
- Versatile Lengths: Available in 5/16"x1", 1-1/2", 2", 2-1/2", and 3" lengths to suit a wide range of wood thicknesses.
- Complete Kit: Each set includes carriage bolts, flat washers, and hex nuts, simplifying your project and reducing the need for additional components.
- Superior Rust Resistance: The hot-dip galvanized finish provides excellent protection against weather and corrosion, ensuring long-lasting performance.
- Flush & Safe Design: Flat head design creates a smooth, flush surface, minimizing sharp edges and enhancing safety.
- Secure Fastening: Square neck design prevents bolts from spinning during installation, and coarse threads provide a strong grip.
Useful Facts
- Thread Size: 5/16"
- Exterior Finish: Zinc (Hot Dip Galvanized - Grade 307A)
- Manufacturer Grade: Grade 307A
- Head Style: Flat
- Thread Type: Right Hand, Coarse (UNC)
Good Fit For
- Deck construction
- Fence building
- Gazebo and pergola projects
- General outdoor repairs and installations
Product details




| Main Specification | |
|---|---|
| Manufacturer | Zivovoy |
| Unit Count | 50 Count |
| Exterior Finish | Zinc |
| Head Style | Flat |
| Manufacturer Grade | Grade 307a |
| Thread Coverage | Fully Threaded |
| Outside Diameter | 7.94 millimeters |
| Brand | Zivovoy |
| Head Type | Carriage |
| Number of Items | 50 |
| Fastener Type | Carriage Bolt |
| Item Diameter | 0.31 Inches |
| Fastener Size | 5/16*2-1/2 |
| Thread Size | 5/16" |
| Colour | Silver |
| Thread Type | Unc |
| Product information | |
| Set Name | Zivovoy 50-Piece Carriage Bolt Kit |
| Technical Details | |
| Thread Style | Right Hand or Coarse |
| Part Number | CB-5/16*2-1/2 |
| Model | 5/16" x 2-1/2" |
| Thread Class | 3A |
| Compatible groove diameter | 7.94 millimeters |
| Item Hardness | Grade 307A |
| Set Screw Thread Type | Unified National Coarse (Unc) |
| Style | |
| Finish Types | Hot Dip Galvanized |
| Measurements | |
| Item Dimensions | 6.7 x 4.3 x 2.8 inches |
| Others | |
| Product Type | Carriage Bolts |
| Size Name | 5/16*2-1/2 |
| Screw Head Style | Flat |
| Screw Point Style | Flat Point |












