Value Collection SEWCIS-100USA-100BX Lock Washer 100pk

Product Description

The VALUE COLLECTION SEWCIS-100USA-100BX is a No. 10 screw external tooth lock washer manufactured from Grade 2 steel with a zinc-plated finish. The external tooth design bites into the mating surface and fastener head to resist loosening under vibration and torque. With an inside diameter of 0.205 inches, an outside diameter of 0.354 inches, and a thickness of 0.025 inches, this washer seats flush against a countersunk or flat bearing surface. The zinc plating provides a baseline level of corrosion resistance suitable for indoor and light-duty applications. Each order covers 100 pieces per box, making this a practical restocking unit for service vans, shop benches, and assembly work.

External tooth lock washers in No. 10 sizing are used across HVAC cabinet assembly, electrical panel and enclosure mounting, light-gauge sheet metal work, and general mechanical fastening wherever a standard hex or pan head No. 10 screw must resist rotation or back-out. The countersunk feature on this washer makes it especially useful in applications where the washer must sit flush or near-flush with the workpiece surface. This size is a common consumable in trade work and maintenance operations.

Key Features

• External tooth design locks against vibration-induced loosening
• Inside diameter of 0.205 inches fits No. 10 screw shanks
• Outside diameter of 0.354 inches and thickness of 0.025 inches
• Grade 2 steel construction for standard-duty fastening applications
• Zinc-plated finish for baseline corrosion resistance
• Countersunk profile supports flush seating against workpiece surfaces
• Sold in a 100-piece box for efficient restocking

Compatibility

Designed for use with No. 10 screw fasteners in standard external tooth lock washer applications across HVAC, electrical, and general mechanical assembly.

Installation Notes

Installation is performed by any trade mechanic or technician as part of a standard fastening assembly. Power down or de-energize any electrical equipment before working on panel or enclosure hardware. Place the washer on the fastener shank with the teeth facing the mating surface or fastener head as required by the joint design. Do not reuse lock washers that have been fully compressed, as the locking function is reduced once the teeth are flattened.