Midwest Fasteners Class 8 Zinc Plated Steel Metric Lock Washer

Midwest Fasteners Class 8 Zinc Plated Steel Metric Lock Washer

The Midwest Fasteners Class 8 Zinc Plated Steel Metric Lock Washer is a steel lock washer finished in zinc for corrosion resistance on general fastening and maintenance jobs, available across a size range from 3mm to 20mm (3mm, 4mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm and 20mm) to match a wide variety of metric fastener assemblies. Lock washers like this one install under a nut or bolt head to maintain spring tension against the joint, helping resist loosening from vibration and repeated load cycles on equipment, machinery and structural connections. Every size in this family is manufactured to Class 8 grade requirements, matching it for use with Grade 8 and comparable high-strength fasteners where consistent spring tension and sizing matter. The zinc finish provides a protective barrier against surface rust and moisture exposure across the entire size range, making these washers suitable for both indoor shop use and general outdoor applications where extended bare-steel exposure is not expected.

Key Features

• Size Range: Available in 3mm, 4mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm and 20mm to fit a wide range of metric fastener assemblies.
• Product Type: Lock washer designed to maintain spring tension under a bolt or nut head to help resist loosening.
• Material & Finish: Steel construction with a zinc finish for added corrosion resistance over bare steel, consistent across every size.
• Grade: Class 8, matching the strength requirements of high-grade fastener assemblies at every size in the family.
• Finish Benefit: Zinc plating helps protect the washer surface from rust during storage and service.
• Consistent Sizing: Manufactured for repeatable fit in standard fastener assemblies requiring a lock washer, size after size.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• General equipment and machinery assembly where vibration resistance is needed at the fastener joint.
• Maintenance and repair work requiring a Class 8 lock washer to match high-strength bolts across multiple metric sizes.
• Fabrication and shop assembly projects using steel hardware with a zinc-finished component.
• Replacement of worn or missing lock washers during routine equipment servicing.

Why Midwest Fasteners?

Midwest Fasteners manufactures this lock washer line to Class 8 grade and steel material specifications with a zinc finish across every size from 3mm to 20mm, giving contractors and maintenance techs a dependable, consistently sized lock washer for professional work. Stocking a stated grade and finish on every unit, regardless of size, means fewer surprises when matching hardware for high-strength fastener assemblies on the shop floor or in the field.