227 Piece Thread Cutting & Washer Lock Nut Assortment
227 thread-cutting and washer lock nuts in a pre-packaged assortment covering the most common sizes used in domestic vehicle trim, interior panel, and underhood attachment. Thread-cutting nuts tap their own threads as they're driven in, eliminating the need for a pre-threaded hole in plastic or thin sheet metal — a practical choice for plastic trim brackets, air duct clips, and cover panels.
What's Included
- Thread-cutting nuts — multiple sizes for self-threading into plastic or thin sheet metal
- Washer lock nuts — integrated washer and locking function for vibration-prone applications
- Multiple sizes covering common domestic vehicle fastener applications
- 227 pieces total
Specifications
| Fastener types | Thread-cutting nuts, washer lock nuts |
| Material | Steel, zinc treated |
| Application | Domestic vehicle trim, interior panels, underhood covers |
| Total pieces | 227 |
| Supplier | Auveco |
Best For
- Auto body and trim shops — thread-cutting nuts are used throughout vehicle interiors and underhood areas; a mixed assortment keeps common sizes available without managing individual part numbers
- Fleet maintenance operations — shops that routinely remove and reinstall trim panels, covers, and brackets need both thread-cutting and washer lock nuts in hand for reassembly
- Restoration shops — original thread-cutting nuts often strip or break during teardown; this assortment covers the sizes typically needed to reinstall plastic and sheet metal components
Understanding Thread-Cutting Nuts
Thread-cutting nuts (also called thread-forming or self-threading nuts) are designed to cut or form their own mating threads as they're installed. Unlike standard machine nuts that require a pre-tapped hole, thread-cutting nuts create their own thread engagement — making them the right choice for plastic housings, soft sheet metal, and underbody panels where pre-threading isn't practical.
Washer lock nuts pair an integral flanged washer with a locking feature (serrations or a distorted thread) that resists loosening under vibration — commonly used in areas of the vehicle exposed to road noise and engine vibration.
When selecting a thread-cutting nut, the pilot hole diameter is critical: too small and the nut won't advance; too large and thread engagement will be insufficient to hold. The screw diameter and material being threaded into determine the correct pilot hole size. Questions? Contact us.
Shipping & Ordering
- Ships within 1–2 business days from our warehouse
- Volume pricing available — save up to 20% when ordering 3 or more
- Reorder regularly? Ask us about a B2B account with a quarterly restock cadence and custom pricing — contact us