Screw Cup Washers feature a domed cup that covers the screw head and a flat bearing base that distributes clamping force over the supporting surface. Zhenhua manufactures screw cup washers in AISI 304, AISI 316 and 65Mn, with standard sizes from M2 to M12 and custom cup depths, outside diameters, wall thicknesses and cup angles available according to confirmed drawings.
Stamping parts manufacturer
Owned factory
Stamping capacity · 120 presses up to 450 T
Quotation response
Recommended Technical Specification Table
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Dimensions are shown in mm. Custom dimensions and materials are available upon request.Standard sizes M2–M12; custom cup depth, OD and cup angles (82° / 90° / 100°) available per confirmed drawing.
Screw cup washers are formed fastening components designed to cover and accommodate screw heads while providing a defined bearing surface. The domed cup creates a cleaner finished appearance by enclosing the screw head, while the flat base distributes the applied clamping force over a wider contact area.
Zhenhua manufactures screw cup washers through stamping and deep-drawing processes, with cup geometry developed according to the required screw head type. Common cup angles include 82°, 90° and 100°.
As an experienced China screw cup washer manufacturer, Ningbo Yinzhou Zhenhua Stamping Parts Co., Ltd. supplies AISI 304, AISI 316 and 65Mn options in standard M2–M12 sizes, while supporting customized dimensions for automotive interior and exterior trim, furniture, electrical and electronic equipment, sheet-metal enclosures, machinery and outdoor equipment.
The product is manufactured as part of Zhenhua's broader stamped fastening component portfolio, backed by more than 30 years of stamping and fastening manufacturing experience since 1993.
The domed cup covers the screw head, helping create a smooth finished surface and reducing direct exposure of the screw head. This structure is particularly useful for assemblies where appearance, surface protection or reduced snagging is required.
The flat bearing base provides a defined contact surface and distributes the clamping load over the supporting material, helping reduce localized indentation on softer substrates.
Through stamping and deep-drawing processes, Zhenhua controls the cup profile, dimensions and forming consistency according to the approved product drawing.
AISI 304, AISI 316 and 65Mn are available for different mechanical, corrosion-resistance and application requirements.
The material of a screw cup washer is selected according to the required corrosion resistance, mechanical performance and service environment.
For stainless steel products, plain, polished or passivated finishes can be supplied according to the required appearance and corrosion-resistance level.
For 65Mn products, zinc plating, black oxide, phosphating and Dacromet are available according to the required protection and application environment.
Special surface treatments can also be evaluated according to customer requirements, with the process and lead time confirmed during inquiry.
Screw cup washers are used where the screw head needs to be covered, the bearing load needs to be distributed over the supporting surface, or a cleaner finished appearance is required.
Used where exposed screw heads need to be covered as part of the finished assembly.
Suitable for visible fastening points where a cleaner and more finished appearance is required.
Used in equipment assemblies, panels and sheet-metal enclosures.
Suitable for fastening assemblies where the screw head configuration and bearing surface need to be controlled.
304 or 316 stainless steel can be selected according to the required corrosion resistance and service environment.
Established in 1993, specializing in fasteners and precision stamping.
120 stamping machines below 250 tons and 10 fully automatic stamping lines.
AISI 304, AISI 316 and 65Mn for different application requirements.
82° / 90° / 100° cup angles, with custom cup depth, diameter, wall thickness and profile.
Process control and traceability from raw materials to finished parts.
Products recognized and purchased by Volkswagen, General Motors, Philips and Shanghai Bell.
Founded
Fastener & Stamping Experience
Stamping Machines
Automated Stamping Lines
Standard Size Range
Main Material Options
A screw cup washer uses a formed cup to cover the screw head, while a standard flat washer leaves the screw head exposed. The cup washer is therefore selected when screw head coverage, finished appearance or a specific assembly structure is required.
Yes. 82°, 90° and 100° cup angles are available for different screw head and assembly requirements. The appropriate angle should be confirmed according to the actual screw head geometry.
Zhenhua supplies AISI 304, AISI 316 and 65Mn. Material selection depends on corrosion exposure, required hardness and strength, and the customer's application.
Yes. Cup depth, outside diameter, wall thickness, flange width, dome profile and cup angle can be customized according to the confirmed drawing or sample.
Yes. Zhenhua supports sample development, small-batch trial production and mass production. Tooling and sample arrangements are confirmed according to the product structure and order requirements.
Available treatments include plain, polished, passivated, trivalent blue-white zinc, black oxide, phosphating and eco-friendly Dacromet. Special finishes can be discussed according to the material and application.
AISI 304 standard sizes are generally kept in stock and can be prioritized. Other materials or non-standard sizes are generally produced within approximately 15–30 days, with the final lead time confirmed according to specifications, quantity and production schedule.
For reassembly, using a new washer is recommended when required by the customer's assembly specification or application. Reuse should be evaluated according to the actual product design and service requirements.
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