[10000 BULK] Lock Washers External Internal Steel Black Oxide #12

Lock Washers External Internal Steel Black Oxide #12 are engineered to secure fastener assemblies encountering vibration and dynamic loads. This versatile washer features both external and internal locking teeth in a single steel component, delivering superior anti-loosening performance for a wide range of applications. Finished in black oxide, it combines corrosion resistance with a low-profile, professional look.

Key Features

• Material: Steel for strength and long wear life.
• Finish: Black oxide for enhanced corrosion resistance and a sleek, non-reflective surface.
• Locking Action: External serrations paired with internal teeth provide robust anti-loosening performance in vibration-prone assemblies.
• Size: #12 to fit standard bolt patterns and fasteners.
• Design: Combines external and internal locking features in a single washer for versatile use.
• Applications: Automotive, machinery, equipment, and general hardware where secure assemblies are critical.

Why choose external internal lock washers?

These washers prevent fastener loosening caused by vibration, shock, and thermal cycling. The dual-locking design offers improved grip on both the bolt head and the mating surface, helping maintain clamping force over time.

Usage tips

Place the washer between the fastener head and the surface, then tighten to the recommended torque. The teeth should bite into the surface to create a secure, resistant-to-loosening joint. Use with compatible bolts and nuts for best results.