Black 304 Stainless Steel Carriage Bolts M5 M6 M8 – 20 Pack
Black 304 Stainless Steel Carriage Bolts M5 M6 M8 – 20 Pack
Black Square Neck Round Head Carriage Bolts – 304 Stainless Steel
Built for strength and longevity, these premium black carriage bolts feature a classic round head and square neck design that prevents rotation during installation for a tight, secure fit every time. Whether you're tackling a deck build, furniture assembly, or automotive project, these bolts deliver professional-grade fastening power with a sleek matte-black finish.
Key Features
- Premium 304 Stainless Steel: High-quality material with a black finish offering excellent corrosion resistance, rust protection, and long-lasting durability for indoor and outdoor applications.
- Square Neck Design: The square neck seats firmly into pre-drilled holes, preventing the bolt from spinning while you tighten the nut — no tools needed on the bolt head.
- Multiple Size Options: Available in M5, M6, and M8 diameters with lengths from 8mm up to 50mm, following standard specifications for easy compatibility with nuts and washers.
- Full-Thread Smooth Shaft: Provides reliable, even clamping force across wood, metal, and composite materials.
- Versatile Applications: Ideal for furniture assembly, deck building, trailer construction, automotive repairs, fencing, and general DIY projects.
- Easy Installation: Insert through a pre-drilled hole and fasten with a compatible nut — no specialist tools required.
Specifications
| Material | 304 Stainless Steel (Carbon Steel base with black finish) |
| Color | Black |
| Available Sizes | M5, M6, M8 |
| Length Range | 8mm – 50mm |
| Head Style | Round Head, Square Neck |
| Package Contents | 20 × Carriage Bolts |
| Country of Origin | Made in China |
Note: Due to light reflection and display settings, the actual colour may vary slightly from product images. Measurement tolerance is ±1–3mm.
Related Products You May Like
- 10-in-1 Multi-Functional Bone Wrench Hex Socket Spanner – Portable Repair Hand Tool
- 16-in-1 Multi-Function Bike Repair Tool Portable Folding Hex Wrench Set
- 48-Pc MIG Welding Nozzle & Tip Set – MB15 AK15 Torch
Learn more: OSHA on eye and face protection
Frequently Asked Questions
Q: What sizes are available for these black stainless steel carriage bolts?
A: These carriage bolts are available in M5, M6, and M8 diameters, with lengths ranging from 8mm to 50mm. All sizes follow standard specifications, making them compatible with standard nuts and washers for easy assembly.
Q: Are these carriage bolts suitable for outdoor use?
A: Yes. Made from 304 stainless steel with a durable black finish, these bolts offer excellent corrosion and rust resistance, making them well suited for both indoor and outdoor applications such as deck building, fencing, and trailer construction.
Q: How do I install square neck carriage bolts?
A: Simply drill an appropriately sized hole in your material, insert the bolt so the square neck seats flush into the hole (this prevents spinning), then thread on a compatible nut and tighten from the nut side. No wrench is needed on the bolt head.
Q: How many bolts are included in each pack?
A: Each pack contains 20 carriage bolts. Only the bolts are included; nuts, washers, and other hardware are not included unless otherwise stated.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.