Value Collection SEW7X0800-100BX M8 Lock Washer Ss 100pk

Product Description

The VALUE COLLECTION SEW7X0800-100BX is an external tooth lock washer sized for M8 screws and bolts. It features a 8.4mm inside diameter, a 15mm outside diameter, and a 0.8mm thickness. Constructed from grade 18-8 austenitic stainless steel (A2), this washer delivers solid corrosion resistance without any additional coating. The external serrated teeth bite into the mating surface and fastener head to resist loosening under vibration and torque. This washer is sold in a minimum order quantity of 100 pieces, making it suited for production runs, maintenance kits, and high-volume repair work. Licensed trades and industrial assemblers reach for this type of hardware when a standard flat washer is not sufficient to prevent fastener back-out.

External tooth lock washers in this size range are used across mechanical, electrical, plumbing, and HVAC panel assembly applications wherever M8 fasteners are specified. They are common in equipment enclosures, electrical panel grounding connections, structural brackets, and machinery assemblies where vibration is a concern. The uncoated stainless steel finish makes them appropriate for wet, humid, or mildly corrosive environments where zinc-plated hardware would degrade over time.

Key Features

• External tooth design grips both the fastener head and mating surface to resist loosening under vibration
• 8.4mm inside diameter fits M8 screws and bolts
• 15mm outside diameter provides adequate bearing surface for M8 fastener heads
• 0.8mm thickness for low-profile installation where stack height is a factor
• Grade 18-8 austenitic stainless steel (A2) for corrosion resistance in wet or humid environments
• Uncoated finish — no risk of coating flaking or interfering with grounding connections

Compatibility

Designed for use with M8 screws and bolts requiring an external tooth lock washer with an 8.4mm inside diameter and 15mm outside diameter. Does not meet military specifications.

Installation Notes

Install with the teeth facing the fastener head or the mating surface depending on the application requirement — external tooth washers are typically placed directly under the fastener head. Ensure the mating surface is clean and free of debris so the teeth can seat fully. Power down or de-energize equipment before installing in electrical panel or grounding applications per NEC guidelines. Do not reuse lock washers after removal, as the teeth lose their grip once deformed.