175Pcs M3–M10 Carbon Steel Hex Lock Nut Assortment Kit

175-Piece Carbon Steel Hex Lock Nut Assortment Kit — M3 to M10

Keep every fastening job tight and secure with this comprehensive 175-piece carbon steel hex lock nut kit. Covering the six most common metric sizes — M3, M4, M5, M6, M8, and M10 — this assortment is the only set you'll need for home repairs, furniture assembly, automotive maintenance, outdoor equipment, and DIY workshop projects. Made in Mainland China.

Why You'll Love This Kit

• Rustproof Carbon Steel Construction: Premium carbon steel resists corrosion so your fasteners stay strong even in demanding environments.
• Blue Nylon Insert Anti-Loosening Design: The high-elasticity blue nylon insert creates continuous friction between nut and bolt threads, preventing loosening caused by vibration or repeated movement — ideal for mechanical, automotive, and outdoor applications.
• Complete Metric Size Range: Precision-machined threads in M3, M4, M5, M6, M8, and M10 sizes match the vast majority of standard metric bolts, eliminating the need to purchase individual sizes for different jobs.
• Organized Portable Storage Box: A high-clarity PP plastic storage case with independent compartments sorts each size clearly for fast identification, and keeps small parts from getting lost during storage or transport.
• Precision Machined Threads: Cold-forged and high-precision tapped for smooth, burr-free threads that achieve a tight fit without cross-threading — reducing installation difficulty and improving overall work efficiency.

Specifications

Perfect For

• Home workshop repairs and furniture assembly
• Automotive and mechanical maintenance
• Outdoor equipment and garden structures
• Industrial construction and DIY handicrafts

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Important Notes

• Photos are for illustration purposes only; please refer to the specifications above for exact dimensions.
• Minor measurement differences may occur due to manual measurement tolerances.
• Actual colors may vary slightly from screen to screen due to monitor settings.

Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What sizes are included in this hex lock nut assortment kit?

A: This 175-piece kit includes six standard metric sizes: M3, M4, M5, M6, M8, and M10 — covering the most commonly used bolt sizes for home, automotive, and workshop applications.

Q: What prevents the lock nuts from loosening over time?

A: Each nut features a high-elasticity blue nylon insert that creates continuous friction against the bolt threads. This nylon lock mechanism effectively resists loosening caused by vibration, movement, or repeated use, ensuring a stable and secure fastening connection.

Q: Are these hex lock nuts suitable for outdoor use?

A: Yes. The carbon steel construction is treated for corrosion resistance, making these nuts well-suited for outdoor equipment, garden structures, and other environments where exposure to moisture or the elements is a concern.

Q: Does the kit come with a storage case?

A: Absolutely. All 175 pieces arrive pre-sorted in a durable, transparent PP plastic storage box with individual compartments for each size, making it easy to find the right nut quickly and keep your workspace organized.

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.