[email protected] +86-563-4186973 / +86-563-4186334 / +86-563-4186971
Belleville Spring Washers, also known as Butterfly washers, are specialized fasteners designed to distribute loads and provide a stable, secure fit in a wide range of applications. Characterized by their distinctive shape, butterfly washers feature a central hole with two extended "wings" or flanges on either side. These wings create a larger surface area that helps to evenly distribute the pressure exerted by a fastener, reducing the risk of damage to the surface being fastened. The primary function of butterfly washers is to prevent loosening of bolts, screws, and other fasteners, especially in applications subject to vibration or dynamic loads. By spreading the load over a larger area, they help to minimize the potential for material deformation, wear, or failure. This makes them particularly valuable in industries such as automotive, aerospace, machinery, and construction, where reliability and stability are crucial. Butterfly washers are commonly made from various materials including stainless steel, carbon steel, aluminum, and plastic, depending on the specific requirements of the application. Stainless steel versions are highly resistant to corrosion and are often used in outdoor or marine environments, while plastic variants might be chosen for lightweight or non-corrosive applications. In addition to their practical uses, butterfly washers also play a role in maintaining aesthetic integrity, as their design can contribute to a cleaner, more polished appearance of the assembled components. Available in numerous sizes and specifications, butterfly washers can be tailored to meet the needs of different projects, ensuring both functionality and visual appeal.
A drawing for a DIN 471 circlip arrives with "2B finish" written in the title block. The quote comes back quickly, the parts ship on time, and then inspection measures 0.6 µm Ra o...
A drawing that says only "steel hardened and tempered, 45–50 HRC" leaves three decisions open: which grade of steel, what tempering temperature the supplier actually held, and how...
A coastal wind site pulled a stainless circlip out of an aluminum gearbox bore after 14 months of service. The circlip still looked new. The aluminum groove behind it was covered ...
A 5 MW coastal solar tracker lost three bearing positions in its eighteenth month of service. The 304 stainless circlips holding each pillow block had pitted through along the gro...
Anhui Ningguo Dongbo Fastener Co., Ltd. is a Belleville Spring Washer manufacturer producing high-load disc springs to DIN2093 and custom specifications. Our range covers conical spring washers that maintain bolt preload, absorb vibration, and compensate for thermal cycling in automotive, construction machinery, energy, and power tool assemblies.
Dongbo operates a full-process production system for retaining rings, washers, and stamped fasteners. For Belleville spring washers, we produce the high-load DIN2093 series in outer diameters from 8 mm to 250 mm, with material grades including 51CrV4, 50CrV4, 50CrVA, and 60Si2Mn. Each washer is formed, heat treated, surface finished, and inspected in-house.
Our annual output capacity reaches 3.5 billion pieces across all product lines, supported by precision rolling, mold design, stamping, machining, heat treatment, phosphating, ultrasonic cleaning, automatic optical screening, and performance testing. This vertical integration allows us to control dimensional consistency and delivery timing for both standard and custom Belleville washers.
Our Belleville spring washer range is organized around the DIN2093 standard, which defines the conical disc geometry, thickness tolerances, and load-deflection behavior. We also produce custom disc springs when an application requires non-standard diameters, heights, or material grades.
| Product Type | Key Specifications | Typical Applications |
| High-load Belleville Spring Washer – DIN2093 | Outer diameter 8–250 mm; thickness 0.2–14 mm; 51CrV4, 50CrV4, 50CrVA, 60Si2Mn | Bolted flange joints, gearboxes, clutches, suspension systems, wind turbine bearings |
| Custom Belleville Washers | Non-standard d, D, S, t; material and surface treatment to drawing | Specialty machinery, prototypes, replacement parts for imported equipment |
| Related Washers and Stamped Parts | Flat washers, spherical washers, non-standard stampings | Load distribution, wear protection, assembly kits |
For applications requiring shaft or bore retention, our Internal Circlips and External Circlips complement Belleville washers in the same assembly. We also supply Flat Washers for load distribution under the spring washer.
Belleville spring washers require high fatigue strength and consistent elastic behavior. We select material grades based on the working stress, temperature, and corrosion exposure of each application.
Surface treatments include phosphating (zinc or manganese), Dacromet, Jumet, mechanical galvanizing, colored zinc, electrophoresis, and passivation. The choice depends on salt spray test requirements and the desired appearance. We confirm the treatment and color during quotation.
DIN2093 defines the dimensional and performance requirements for Belleville spring washers. Our production follows this standard for the high-load series, with thickness tolerances that vary by size range.
| Nominal Outer Diameter (mm) | Thickness Range (mm) | Thickness Tolerance (mm) | Height Tolerance (mm) |
| 8–12.5 | 0.2–0.6 | +0.02 / −0.06 | +0.10 / −0.05 (S < 1.25) |
| 14–22.5 | 0.6–2.0 | +0.03 / −0.09 (0.6 < S < 1.25); +0.15 / −0.08 (1.25 ≤ S ≤ 2.0) | +0.20 / −0.10 (2.0 < S ≤ 3.0) |
| 25–50 | 1.25–3.8 | +0.04 / −0.12 | +0.20 / −0.10 (2.0 < S ≤ 3.0) |
| 56–100 | 3.8–6.0 | +0.05 / −0.15 | +0.30 / −0.15 (3.0 < S ≤ 6.0) |
| 112–250 | 6.0–14.0 | ±0.10 | ±0.30 (6.0 < S ≤ 14.0) |
These tolerances ensure that the washer compresses predictably and maintains the designed load at the specified deflection. For custom washers, we work from your drawing or sample and confirm critical dimensions before production.
Dongbo is IATF16949, ISO14001, and CNAS certified. Our testing center performs material element analysis, mechanical property testing, hardness testing, and metallography. For finished Belleville washers, we conduct full inspections according to customer requirements and international standards.
We use multifunctional three-coordinate measuring machines, electron microscope analyzers, and self-developed testing equipment to verify dimensions and load characteristics. Each production process has corresponding inspections, and barcode management supports traceability from raw material to finished goods.
Our engineering team supports custom Belleville spring washers for applications where standard DIN2093 sizes do not fit. We adjust inner diameter, outer diameter, thickness, and height to achieve the required load-deflection curve. Material selection can be changed to stainless steel or other spring steels, and surface treatment can be specified for corrosion resistance or appearance.
We also produce non-standard stamping parts and special-shaped washers. If your assembly requires a combination of Belleville washers, retaining rings, and flat washers, we can coordinate production and packaging as a kit. See our Product Customization capabilities for more detail.
Belleville spring washers are installed with the concave side facing the load or as specified by the joint design. Correct orientation ensures the washer compresses uniformly and delivers the intended preload. We recommend replacing washers that show permanent deformation, cracking, or significant loss of height after service.
For maintenance planning, we can supply replacement washers in the original specification or with improved material and surface treatment. Our packaging options include bag, blister, masking paper, oil paper, and custom repair kits to support field service operations.
To prepare an accurate proposal for Belleville spring washers, we need the following project data. This allows us to confirm feasibility, material grade, surface treatment, and packaging.
We respond to inquiries within 24 hours on weekdays and work with you to finalize the specification before production.
A Belleville spring washer is conical and acts as a spring, storing and releasing energy to maintain bolt preload. A flat washer distributes load but does not provide spring action. Belleville washers are used where vibration, thermal cycling, or bolt relaxation would otherwise reduce clamping force.
Yes. We manufacture custom Belleville spring washers from drawings or samples. Provide the inner diameter, outer diameter, thickness, height, material, and load requirement, and our engineers will confirm the design and quotation.
Our standard high-load series uses 51CrV4, 50CrV4, 50CrVA, and 60Si2Mn. We can also produce washers in stainless steel or other spring steels depending on the application environment and required fatigue life.
We perform in-process inspections after each production step and final inspections on finished washers. Our testing center is CNAS accredited and can verify material composition, hardness, dimensions, and load characteristics. Barcode traceability links each batch to its production records.
We offer phosphating (zinc or manganese), Dacromet, Jumet, mechanical galvanizing, colored zinc, electrophoresis, and passivation. The appropriate treatment depends on the required salt spray hours and the operating environment. We confirm the treatment and color during order review.
Our annual production capacity is 3.5 billion pieces across all product lines. Lead time depends on the specific washer size, material, surface treatment, and order quantity. We provide a confirmed delivery schedule with each quotation.
No. 110, West Outer Ring Road, Ningguo economic and Technological Development Zone, Anhui.
+86-563-4186973 (Export Business)
PRODUCT LIST
Internal Circlips External Circlips Snap Rings Belleville Spring Washer Flat Washers Non-standard Stamping PartsGET A QUOTE
Copyright © Anhui Ningguo Dongbo Fastener Co., Ltd. All Rights Reserved.
Belleville Spring Washer Factory
English
中文简体
