Product Specification

Detailed Product Description

Flat Spring Washer – Conical Disc Spring / Belleville Washer DIN 2093 (51CrV4 / Stainless 304/316)

Flat spring washers (Belleville disc springs) are conical-shaped spring elements designed to maintain bolt preload under vibration, thermal expansion, and material creep. Manufactured to DIN 2093 and GB/T 1972 standards, these washers deliver high spring force within a compact axial space. Available in carbon spring steel (51CrV4, CK75) and stainless steel (301, 304, 316) with various finishes including zinc plating, Dacromet®, and PTFE coating. Stackable in parallel or series for custom load and deflection characteristics.

Product Description

Specifications

Flat Spring Washer (Belleville Disc Spring)

Product Parameters

Chemical Composition (51CrV4 Spring Steel)

Chemical Composition (Stainless Steel 304)

Physical & Mechanical Properties

Thermal Performance

Main Characteristics

High Spring Force in Compact Axial Space
Conical disc design delivers high load capacity with very low solid height – ideal for confined bolted joints where coil springs cannot fit.

Vibration Dampening
Absorbs dynamic loads and prevents nut loosening caused by machinery operation, wind forces, or vehicle movement.

Thermal Expansion Compensation
Maintains bolt preload when temperature changes cause joint components to expand or contract – eliminates need for re-torquing.

Parallel Stacking – Load Multiplication
Multiple washers stacked in the same direction multiply total load while deflection remains the same.

Series Stacking – Deflection Multiplication
Washers stacked in opposite directions increase total deflection while load remains constant.

Progressive Spring Rate
Load increases as washer flattens, matching the rising resistance of bolted joints and gaskets.

No Re-Torquing Required
Actively compensates for gasket settling and bolt relaxation – reduces maintenance intervals.

Creep Resistance
Maintains clamping force even when soft materials (gaskets, plastics) relax over time.

Corrosion Resistance Options
Zinc, Dacromet®, PTFE, and stainless steel finishes available for indoor, outdoor, and marine service.

Self-Centering Design
Inner diameter fits snugly on bolt shank – automatic alignment during assembly.

Long Service Life
Engineered for millions of cycles without fatigue failure – field proven in critical applications.

Application Field

Flat spring washers are widely used in bolted joints where vibration, thermal cycling, and material relaxation are present.

1. Flanged joints – pipe flanges, heat exchangers, pressure vessels

2. Wind turbine – tower and hub bolted rings, blade connections

3. Heavy machinery – mining crushers, vibrating screens, compressors

4. Valve assemblies – control valves, actuators, safety relief valves

5. Electrical connections – bus bars, transformer covers, switchgear

6. Automotive – clutch packs, brake calipers, suspension fasteners

7. Railroad – rail fastening systems, bogie bolting

8. Pumps and motors – bearing covers, housing fasteners

9. Construction – steel structure bolting, pre-engineered buildings

Our Service

Why Choosing TOBO Metal Industrial:

• Sufficient Forging, Heating, and Machining Equipment

• In-house Inspection Instruments for Quality Control

• Competitive Price & High Quality Assurance

• Fast, Effective and Efficient Services

• 100% Load Testing Available

• Experienced Professionals in Communication

• Complete Traceability with Mill Test Reports

Our Company

1. We are one of the Professional Manufacturers and Exporters of Pipeline Products and Fasteners in China. Our company was established in 1998, the plant covers 550,000 square meters with a construction area of 68,000 square meters, employing 260 workers and 45 technicians.

2. We have five branch factories which can supply the best quality pipes, tubes, fittings, flanges, washers, and related accessories. Now, we own a number of advanced production equipments, including metal processing, forging, machining, cold forming, and heat treatment facilities. Annual production capacity exceeds 60,000 tons. Our company maintains various detection devices, such as non-destructive testing, chemical analysis, metallographic examination, and physical experiments. Main products include pipes, fittings, flanges, spring washers, disc springs, and custom fasteners.

3. Additionally, we are authorized by more than 120 top-class mills from South Korea, Japan, and China, including JFE, SUMITOMO, POSCO, BAOSTEEL, TISCO, LISCO, TPCO, HENGYANG VALIN, and others.

Packing & Delivery

1. Packing Details: Plastic bags + cartons + wooden pallets, or depends on customer's requirement

2. Delivery Details: 7-15 days after the purchase order

FAQ

Q: Are you a trading company or manufacturer?
A: We are a factory with direct production capabilities.

Q: How long is your delivery time?
A: Generally 5-10 days if the goods are in stock. For custom orders, 15-20 days depending on quantity and specifications.

Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer samples free of charge, but the customer pays the freight cost.

Q: What are your terms of payment?
A: Payment ≤ 1000 USD, 100% in advance. Payment ≥ 1000 USD, 50% T/T in advance, balance before shipment.