When selecting a metric flange bolt assortment, aim for a kit that balances a wide size range, strong material, and practical organization. This guide highlights five top options suited for DIYers, automotive hobbyists, and light industrial jobs. The best picks offer varied bolt lengths, strong corrosion resistance, and clear storage to minimize search time on future projects.
Overview at a glance:
| Product | Sizes Included | Best For | Notes |
|---|---|---|---|
| Kadrick 700Pcs | M6, M8, M10; 12–45mm | General mechanical, indoor/outdoor | Eco-friendly coating; large total count |
| Taiss 3160PCS | M2–M10; 4–45mm | Comprehensive projects, varied heads | Double-layer portable packaging |
| RC Lelut 820pcs | M6–M12; 16–50mm | Vibration-prone environments | Flange bolts with zigzag grip |
| Besitu 280Pcs | M6–M10; 12–30mm | Automotive and small engine work | 10.9 alloy, black galvanized |
| JVSRM 751pcs | M6–M12; 12–50mm | Heavy equipment and vibration | True Class 10.9 strength |
Kadrick 700Pcs Grade 8.8 Metric Bolt Assortment
The Kadrick kit is best for general mechanical work and backup storage. It includes 175 bolts, nuts, washers, and spring washers across M6, M8, and M10 sizes, with lengths from 12 to 45 mm. Made from carbon steel with a high-strength 8.8 rating, these bolts are designed to withstand higher preload forces and resist loosening in dynamic applications. The eco-friendly trivalent chromate coating provides corrosion resistance for both indoor and outdoor use. Use this kit when you need a large, ready-to-go supply for frequent projects and prefer a single, comprehensive package.
Who it’s best for: hobbyists and small shops needing a broad, robust flange bolt collection that emphasizes strength and environmental considerations. Caution: heavier weight (over 8 pounds) makes this kit less portable for on-site fieldwork.
Taiss 3160PCS Metric Flange Bolt Assortment Kit
This kit excels for highly varied projects due to its 42 sizes and multiple head types (Hex Flange, Socket Button, Cap Head). It covers M2 through M10 threads and 4–45 mm bolt lengths, with a dual-layer, portable toolbox. The organization with labeled compartments speeds selection, and the flange bolts are designed to resist loosening under vibration. Choose Taiss when you want a top-to-bottom range in one purchase and value easy portability for fieldwork or job sites.
Best for: users who need extensive size variety and versatile head styles in a single, portable package. Limitation: the sheer volume can be overwhelming if you only need a few common sizes.
RC Lelut 820pcs Metric Flange Bolt Assortment
RC Lelut emphasizes vibration resistance with a serrated flange design that helps prevent loosening in HVAC systems, machinery, and marine equipment. This 820-piece kit spans 16 bolt sizes from M6 to M12 and lengths from 16 to 50 mm, incorporating washers and nuts to support fastener integrity. It is better for projects where vibration is a major concern and installation surfaces vary in hardness. Best for: workshops needing stable, vibration-proof mounting. Caution: ensure you have enough space to store the included multiple compartments neatly to avoid misplacing parts.
Besitu 280Pcs Metric Flange Bolt Assortment
Besitu focuses on automotive and small engine applications with 280 pieces spanning M6 to M10, lengths from 12 to 30 mm. The kit uses 10.9 grade alloy steel with a black galvanized finish for corrosion resistance and high strength. This makes it a strong choice for high-torque environments yet compact enough for toolboxes and automotive workbenches. Best for: automotive enthusiasts and repair projects requiring high-torque-capable fasteners. Limitation: the range is narrower than larger kits, so you may need to supplement for bigger projects.
JVSRM 751pcs Class 10.9 Flange Bolts Kit
The JVSRM kit is designed for heavy equipment and vibration-prone repairs. It includes a wide range of M6–M12 flange bolts with lengths up to 50 mm and accompanying nuts, washers, and spring washers. Made from 20MnTiB alloy steel and heat-treated to around 1040 MPa, these bolts aim to deliver strong performance under high stress. Choose this kit for structural, off-road, or industrial settings where vibration control and strength are critical. Limitation: higher-strength bolts may require compatible tools and torque control to avoid over-tightening.
Buying Guide
What sizes do you actually need? Start by listing the most common M6, M8, and M10 sizes your projects require and note typical lengths. A kit with 16–40 mm options covers many standard jobs, while longer bolts solve mounting in thicker materials.
Which head types matter? Hex flange heads are versatile, but socket button and cap heads offer different aesthetics and application fits. If you work in vibration-heavy environments, look for serrated flanges to reduce loosening.
Material and coating considerations: 10.9 or 8.8 grade bolts provide higher strength than standard bolts. Zinc, black zinc, or chromate coatings boost corrosion resistance but ensure you match coating to your environment (indoor vs outdoor, salt exposure, etc.).
Organization matters: clearly labeled compartments and a sturdy storage case save time during setup and prevent part mix-ups on-site.
Portability vs. total count: larger kits are great for a workshop but can be cumbersome for field work. Consider a dual-bag or double-layer toolbox if you move between sites often.
Frequently Asked Questions
- What is a flange bolt? A flange bolt has a widened bearing surface (flange) to distribute load and reduce loosening under vibration.
- What does grade 8.8 or 10.9 mean? These denote the bolt’s strength class; higher numbers indicate stronger bolts suitable for high-torque applications.
- Do I need washers with flange bolts? Yes, washers help distribute load and prevent damage to the mounting surface; use lock washers if vibration is present.
- How should I store a large bolt assortment? Use the kit’s labeled compartments or a modular storage box to keep sizes organized and accessible.
- Can I mix bolt sizes within a project? Yes, match bolt size to the threaded hole and material thickness, ensuring proper torque and engagement.
- What’s the advantage of a serrated flange? Serrated flanges bite into the mounting surface, improving resistance to loosening in dynamic environments.