Brass Cup Washers

Brass Cup Washers

We are manufacturers, suppliers, and exporters of Brass Cup Washers from our precision press shop in India. Brass cup washers, also known as brass finishing washers, brass countersunk finishing washers, brass penny washers, brass decorative washers, brass dome washers, brass cappuccino washers, and brass screw cup washers, are pressed components that combine a functional washer with a decorative or protective cup-shaped countersink seat. They are fitted under the heads of countersunk screws and bolts to provide a neat, flush-finish appearance and to distribute the fastener load over a larger bearing area on soft materials such as wood, plastic, and composites.

Brass cup washers are particularly popular in joinery, furniture, boat building, architectural hardware, interior design, and decorative metalwork applications where the exposed fastener finish must match brass hardware. The cup shape accepts the conical underside of a countersunk screw head and presents a smooth, attractive brass surface visible on the assembled product. The combination of corrosion resistance, attractive appearance, and ease of pressing makes brass the preferred material for finishing washers used in quality joinery and marine woodwork.

Types of Brass Cup Washers We Manufacture

Standard Brass Screw Cup Washers: Pressed from brass strip to a rounded cup profile with a central countersunk hole matching #6, #8, #10, #12, #14 countersunk screws (imperial) and M3, M4, M5, M6, M8 countersunk screws (metric). The most widely used type in furniture, joinery, and wooden boat construction.

Raised Cup Washers (Deep Profile): Deeper cup profile for use with longer-shank countersunk screws where the screw head needs a greater depth of seat. Used in thicker material assemblies and in structural timber joinery.

Flat Rim Cup Washers: Cup washers with a flat outer flange rather than a domed rim, providing a flat bearing face on the substrate. Used where a flush top surface is required, particularly in boat deck fittings.

Large Diameter (Penny Cup) Washers: Cup washers with an oversized outer diameter (penny washer dimensions) for use on soft wood, fibreboard, and plastic where the load must be spread over a large area to prevent pull-through or surface crushing.

Mirror-Polished Brass Cup Washers: Cup washers finished to a high mirror polish for decorative hardware, musical instrument fittings, architectural metalwork, and premium furniture applications.

Lacquered Brass Cup Washers: Cup washers with a clear lacquer coating to protect the brass surface from tarnishing, used in interior furniture and wooden fittings where long-term appearance maintenance is desired.

Antique / Satin Brass Cup Washers: Cup washers with an antique gold or satin brushed finish to complement traditional or period-style furniture hardware and architectural ironmongery.

Materials and Dimensions

Our brass cup washers are pressed from high-quality brass strip alloys CW614N (CZ121 free-cutting brass) or CW508L (CZ108 cartridge brass), providing the optimal combination of formability (for the deep-draw cup pressing operation), surface finish quality, and corrosion resistance. Thickness of the pressed brass sheet: 0.5 mm to 1.2 mm, appropriate to the screw size. Standard outer diameter range: 10 mm to 32 mm. Available in natural polished brass, lacquered brass, satin brass, antique brass, and nickel-plated finishes.

Screw Size Compatibility

Our brass cup washers are manufactured to fit the following countersunk screw sizes: Imperial: No. 4, No. 6, No. 8, No. 10, No. 12, No. 14 countersunk screws (to BS 450 and ANSI B18.6.1 standards). Metric: M3, M4, M5, M6, M8 countersunk screws (to DIN 7991 and ISO 10642). The countersunk angle of the cup matches 90° countersunk screws (standard) and 82° countersunk screws (imperial), with either version available on request. Custom countersunk angles and diameters can be produced to match non-standard fasteners.

Manufacturing Process

Brass cup washers are manufactured by deep-draw pressing on our high-speed presses, which blank the outer profile, form the cup radius, and pierce the centre hole in a progressive die sequence. The quality of the draw radius is critical to avoid brass cracking during forming, and our tool design ensures a smooth draw with consistent wall thickness and finish. After pressing, washers are tumble-polished to a bright finish, then lacquered, satin-finished, or electroplated according to the specified surface finish. 100% visual inspection for surface defects and dimensional checking of key dimensions (O.D., I.D., and cup depth) is performed.

Applications

Brass cup washers are used in: wooden boat building and marine joinery (teak decks, mahogany panelling, hardwood fittings), furniture manufacturing (cabinet hardware, upholstered seating frames, wooden bed frames, wardrobe fittings), architectural joinery (door frames, window boards, staircases, skirting board fixings), musical instrument construction (guitar hardware, piano fittings), general decorative woodwork, retail display fittings, and garden furniture. Wherever a countersunk screw is used in a visible location on a quality wood product, a brass cup washer is typically specified to provide an elegant finished appearance.

Related Products and Search Terms

Brass cup washers are commonly ordered with: brass countersunk screws, brass wood screws, brass flat washers, brass penny washers, brass screw covers, brass bolt caps, marine brass fittings, brass hinges, brass catches. Search terms: brass cup washer, brass finishing washer, brass countersunk washer, brass screw cup, brass decorative washer, brass cup washer #8, brass cup washer M4, brass cup washer M6, brass penny cup washer, deep brass cup washer, polished brass cup washer, antique brass cup washer, lacquered brass washer, cup washer for wood, marine brass cup washer, brass cup washer manufacturer India, brass cup washer exporter, joinery brass washer.

Why Choose Our Brass Cup Washers?

We manufacture brass cup washers from the highest quality free-cutting and cartridge brass strip, with careful die design to ensure perfect cup draw geometry and consistent surface quality. Our range covers all standard imperial and metric countersunk screw sizes in multiple surface finishes. We supply in bulk packs for trade and wholesale use, and also offer mixed-size assortment kits for general joinery applications. We export to boat builders, furniture manufacturers, architectural hardware distributors, and DIY wholesalers across the UK, Australia, the USA, and Europe.

Frequently Asked Questions (FAQ) – Brass Cup Washers

What is a brass cup washer used for?

A brass cup washer (also called a finishing washer) is fitted under the head of a countersunk screw to provide a neat, decorative finish, to distribute the screw head load over a larger area, and to prevent the countersunk head from being pulled into or through soft materials such as wood or fibreboard.

What is the difference between a cup washer and a flat washer?

A flat washer is a plain flat disc used to distribute load under a bolt head or nut. A cup washer has a shaped cup profile that accepts the conical face of a countersunk screw head, providing both a load-distribution function and a decorative finished appearance.

What screw sizes do your brass cup washers fit?

We manufacture brass cup washers for imperial countersunk screws No. 4 to No. 14 and for metric countersunk screws M3 to M8. Custom sizes outside this range are available on request.

Are your brass cup washers suitable for marine use?

Yes, brass cup washers are widely used in marine joinery including boat decks, cabin panelling, and teak trim. The corrosion resistance of brass in marine environments makes it a standard material for all visible deck hardware fastenings. For highly aggressive saltwater or splash-zone applications, we can also supply cup washers in silicon bronze or stainless steel.

Can you supply lacquered brass cup washers?

Yes, lacquered brass cup washers with a clear protective lacquer are available. The lacquer preserves the bright brass finish and prevents tarnishing in interior furniture and display applications. Unlacquered natural brass will develop a patina over time, which some customers prefer for an aged look.

What is the standard countersink angle for your brass cup washers?

Our standard brass cup washers are formed to accept 90° countersunk screws (the metric standard per ISO 10642 and DIN 7991). For imperial applications requiring 82° countersunk screws (common in American hardware standards), we manufacture 82° cup washers on request.

What is the minimum order for brass cup washers?

For standard sizes and finishes, minimum order is 200 pieces per size. Assorted size kits (multiple sizes in one bag) are available in quantities from 50 complete kits. For custom finishes or non-standard dimensions, minimum order is 500 pieces.

Do you export brass cup washers?

Yes, we export brass cup washers globally. Key markets include the UK, Australia, USA, Germany, New Zealand, and the Middle East. We supply to boat builders, furniture manufacturers, hardware distributors, and joinery trade suppliers.

Request a Quote for Brass Cup Washers

Looking for quality Brass Cup Washers (Finishing Washers) for your joinery, furniture, marine, or hardware application?

📧 Email us at: sales@brass-copper-parts.com with screw size (imperial No. or metric M-size), countersink angle (90° or 82°), surface finish (polished/lacquered/antique), and quantity required

📱 WhatsApp/Call: +91-22-43449300 for advice on screw size compatibility, finish options, and bulk pricing for trade and wholesale orders

🌐 Visit our facility: See our deep-draw pressing and polishing operations for brass cup washers and other decorative pressed components

📋 Request samples: Mixed-size sample packs of brass cup washers in standard screw sizes are available for joinery, boat building, and furniture manufacturing evaluation

Brass & Copper Parts manufactures brass cup washers in the full range of standard metric and imperial screw sizes with multiple surface finishes, supplying furniture makers, boatbuilders, hardware distributors, and architectural hardware suppliers globally. Contact us today.