Silicon Bronze Finishing Cup Washers For Countersunk Screws Marine Grade Built To Last Salt Water Ready 0.306 Inch Inner Diameter 0.682 Inch Outer Diameter 0.134 Inch Thick Size 12 Pack Of 100

Marine-Grade Silicon Bronze Cup Washers for Counterscrews
✔️ 0.306 in ID, 0.682 in OD, 0.134 in thick; 100-pack

These silicon bronze finishing cup washers are marine-grade hardware designed to sit flush against countersunk fasteners. They are commonly used with oval or flat head screws or bolts to create a smooth finished look in marine and wet environments.

✅ Material: Silicon Bronze; Marine Grade
✅ Application: Finishing cup washer for countersunk screws/bolts to create a flush appearance
✅ Size range: Inch sizes #6-#14 (1/4" raised washers) for flush seating
✅ Inner diameter: 0.306 in (7.78 mm)
✅ Outer diameter: 0.682 in (17.33 mm)
✅ Thickness: 0.134 in (3.40 mm)
✅ Pack: 100-pack

💡 What is a marine-grade finishing cup washer used for with countersunk screws in salty environments?

They seal and finish exposed fasteners while standing up to saltwater and humidity.

- They provide a flush appearance for screws in decks, rails, and hardware
- Silicon bronze offers corrosion resistance in marine settings and easy machinability
- The specific ID/OD/thickness fit countersunk fasteners in the #6-#14 range and sit flush with screw heads
- Pack size is commonly 100 units for bulk installations
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