This 160-piece external serrated lock washer assortment is designed to prevent fasteners from loosening due to vibration, movement or torque. Each washer features external serrated (toothed) edges that bite into the surface of the bolt head and the mating material for a secure, shake-proof connection — ideal for industrial, mechanical, automotive, and DIY applications.

All pieces are made from high-quality stainless steel, offering excellent corrosion resistance and long-term durability.

Key Features

• 📦 Complete 160-Piece Assortment – Includes multiple metric sizes from M3 to M12 (exact counts per size supplied in kit).

• 🔧 External Serrated (Toothed) Design – Teeth grip into material and fastener to prevent loosening.

• 🛡️ Shakeproof & Anti-Vibration – Built to resist movement and torque under load.

• 💪 Stainless Steel Construction – Ideal for indoor and outdoor use, corrosion-resistant and rustproof.

• 📁 Storage Case Included – Keeps all washers organised and easy to access.

Sizes Included

• M3

• M4

• M5

• M6

• M8

• M10

• M12

(Exact count per size as packed in the 160pc assortment varies by batch.)

Applications

Suitable for use with bolts, screws and fasteners in:

• Automotive repairs

• Machinery assemblies

• Trailer and equipment fastening

• Industrial maintenance

• Workshop projects

• Marine and outdoor installations

These serrated lock washers are recommended when secure fastening is required in environments with vibration or movement.

Technical Specifications

• Material: Stainless Steel

• Type: External Serrated Lock Washer (Shakeproof)

• Sizes: M3 – M12

• Total Pieces: 160

• Finish: Natural stainless steel, corrosion-resistant