Countersunk washers are used with oval and flat head screws to provide a bearing surface and sealing functionality. Raptor Supplies offers a wide range of countersunk washers from brands like Grainger and Micro-Plastics. These washers work similar to flat washers, but feature a bearing surface for flat head screws.
Features
These washers resist screw heads from splitting wood.
These recessed washers let screws sit flush with the work surface, allowing users to easily varnish, sand and provide a smooth & finished look while installing or repairing wood trim.
They dip inward radially and are elevated on the sides, but the centre is relatively flat & non-elevated.
Countersunk washers can be used by inserting a threaded fastener through the centre.
They are compatible with flat-head fasteners and can distribute the load of a bolt or threaded nut.
These countersunk washers provide better protection from vibrations than flat washers.
Buying Guide
Based On Finish
Zinc Plated
Mild-to-high corrosion resistance in wet environments
Chrome Plated
Provides resistance from chemicals, abrasives, oil & grease, impacts and stains
Black Zinc Plated
Features black chrome layer over zinc plating for black appearance and additional protection
Nickel Plated
Offers resistance against wear, corrosion and adhesives
Black Oxide
Minimises light reflection and provides light-to-medium corrosion resistance
Based On Material
Plastic
Lightweight and cheaper to use than any other material
Brass
Shiny appearance and excellent corrosion resistance
Steel
Provides hardness, structural rigidity and durability
Stainless Steel
Corrosion, heat and fire-resistant properties with moderate structural rigidity
Aluminium
Lighter than stainless steel; imparts non-magnetic properties
Standards
DIN
DIN stands for 'Deutsches Institut f?r Normung', meaning 'German Institute for Standardisation'. As an ISO (International Organization for Standardisation) representative, it advocates for German standards.
ASME
The American Society of Mechanical Engineers was established in 1880. It is a non-profit, professional association that fosters collaboration, knowledge exchange & skill development amongst all engineering disciplines while highlighting the crucial role that engineers play in our society.
Frequently Asked Questions
How do countersunk washers provide better protection against vibrations than flat washers?
When installed, these countersunk washers push against the object for resisting vibrations.
They essentially act as springs. Driving a threaded fastener through the centre will force the washer's sides to collapse, thus pushing against the object.
What are finishing countersunk washers?
Finishing countersunk washers are also known as dress washers.
These washers are machined to be sturdier and provide a better appearance than standard countersunk washers.
Oval and flat head screws sit flush within these countersunk washers.
What are countersunk external-tooth lock washers?
These washers feature teeth that firmly grip heads of 82-degree flat head countersunk screws, preventing joints from loosening due to vibration.
What is the significance of countersunk tight-grip external-tooth lock washers?
The teeth on these washers bite deeper into the screw head & joint than normal external-tooth lock washers. They provide a solid hold, preventing 90-degree countersunk screws from loosening due to vibrations.